ICD-10 Code for Infection

The default ICD-10-CM 2027 code for infection, infected, infective (opportunistic) is B99.9 – Unspecified infectious disease. More specific codes depend on the details documented, as listed in the official index (485 codes, 432 billable).

Main code: B99.9 – Unspecified infectious disease
Billable: Yes

Index entries for Infection

with
- drug resistant organism – see Resistance (to), drug – see also specific organism
- lymphangitis – see Lymphangitis
- organ dysfunction (acute) – R65.20
  - with septic shock – R65.21
abscess (skin)
Absidia – see Mucormycosis
Acanthamoeba – see Acanthamebiasis
Acanthocheilonema (perstans) (streptocerca) – B74.4
accessory sinus (chronic) – see Sinusitis
achorion – see Dermatophytosis
Acinetobacter baumannii, as cause of disease classified elsewhere – B96.83
Acremonium falciforme – B47.0
acromioclavicular – M00.9
Actinobacillus (actinomycetem-comitans) – A28.8
- mallei – A24.0
- muris – A25.1
Actinomadura – B47.1
Actinomyces (israelii) – A42.9 – see also Actinomycosis
Actinomycetales – see Actinomycosis
actinomycotic NOS – see Actinomycosis
adenoid (and tonsil) – J03.90
- chronic – J35.02
adenovirus NEC
- as cause of disease classified elsewhere – B97.0
- unspecified nature or site – B34.0
aerogenes capsulatus – A48.0
aertrycke – see Infection, salmonella
alimentary canal NOS – see Enteritis, infectious
Allescheria boydii – B48.2
Alternaria – B48.8
alveolus, alveolar (process) – K04.7
Ameba, amebic (histolytica) – see Amebiasis
amniotic fluid, sac or cavity – O41.10- (header)
- chorioamnionitis – O41.12- (header)
- placentitis – O41.14- (header)
amputation stump (surgical) – see Complication, amputation stump, infection
Ancylostoma (duodenalis) – B76.0
Anisakiasis, Anisakis larvae – B81.0
anthrax – see Anthrax
antrum (chronic) – see Sinusitis, maxillary
anus, anal (papillae) (sphincter) – K62.89
arbovirus (arbor virus) – A94
- specified type NEC – A93.8
artificial insemination – N98.0
Ascaris lumbricoides – see Ascariasis
Ascomycetes – B47.0
Aspergillus (flavus) (fumigatus) (terreus) – see Aspergillosis
atypical
- acid-fast (bacilli) – see Mycobacterium, atypical
- mycobacteria – see Mycobacterium, atypical
- virus – A81.9
  - specified type NEC – A81.89
auditory meatus (external) – see Otitis, externa, infective
auricle (ear) – see Otitis, externa, infective
axillary gland (lymph) – L04.2
Bacillus – A49.9
- abortus – A23.1
- anthracis – see Anthrax
- ducreyi (any location) – A57
- Flexner's – A03.1
- Friedländer's NEC – A49.8
- gas (gangrene) – A48.0
- mallei – A24.0
- melitensis – A23.0
- paratyphoid, paratyphosus – A01.4
  - A – A01.1
  - B – A01.2
  - C – A01.3
- Shiga (-Kruse) – A03.0
- suipestifer – see Infection, salmonella
- swimming pool – A31.1
- typhosa – A01.00
- welchii – see Gangrene, gas
bacterial NOS – A49.9
- as cause of disease classified elsewhere – B96.89
  - Acinetobacter baumannii – B96.83
  - Bacteroides fragilis [B. fragilis] – B96.6
  - Clostridium perfringens [C. perfringens] – B96.7
  - Cronobacter (sakazakii) – A49.8
  - Enterobacter sakazakii – B96.89
  - Enterococcus – B95.2
  - Escherichia coli [E. coli] – B96.20 – see also Escherichia coli
  - Helicobacter pylori [H.pylori] – B96.81
  - Hemophilus influenzae [H. influenzae] – B96.3
  - Klebsiella pneumoniae [K. pneumoniae] – B96.1
  - Mycoplasma pneumoniae [M. pneumoniae] – B96.0
  - Proteus (mirabilis) (morganii) – B96.4
  - Pseudomonas (aeruginosa) (mallei) (pseudomallei) – B96.5
  - Staphylococcus – B95.8
    - aureus (methicillin susceptible) (MSSA) – B95.61
      - methicillin resistant (MRSA) – B95.62
    - specified NEC – B95.7
  - Streptococcus – B95.5
    - group A – B95.0
    - group B – B95.1
    - pneumoniae – B95.3
    - specified NEC – B95.4
  - Vibrio vulnificus – B96.82
- specified NEC – A48.8
Bacterium
- paratyphosum – A01.4
  - A – A01.1
  - B – A01.2
  - C – A01.3
- typhosum – A01.00
Bacteroides NEC – A49.8
- fragilis, as cause of disease classified elsewhere – B96.6
Balantidium coli – A07.0
Bartholin's gland – N75.8
Basidiobolus – B46.8
bile duct (common) (hepatic) – see Cholangitis
bladder – see Cystitis
Blastomyces, blastomycotic – see also Blastomycosis
- brasiliensis – see Paracoccidioidomycosis
- dermatitidis – see Blastomycosis
- European – see Cryptococcosis
- Loboi – B48.0
- North American – B40.9
- South American – see Paracoccidioidomycosis
bleb, postprocedure – see Blebitis
bone – see Osteomyelitis
Bordetella – see Whooping cough
Borrelia bergdorfi – A69.20
brain – G04.90 – see also Encephalitis
- membranes – see Meningitis
- septic – G06.0
  - meninges – see Meningitis, bacterial
branchial cyst – Q18.0
breast – see Mastitis
bronchus – see Bronchitis
Brucella – A23.9
- abortus – A23.1
- canis – A23.3
- melitensis – A23.0
- mixed – A23.8
- specified NEC – A23.8
- suis – A23.2
Brugia (malayi) – B74.1
- timori – B74.2
bursa – see Bursitis, infective
buttocks (skin) – L08.9
Campylobacter, intestinal – A04.5
- as cause of disease classified elsewhere – B96.81
Candida (albicans) (tropicalis) – see Candidiasis
candiru – B88.8
Capillaria (intestinal) – B81.1
- hepatica – B83.8
- philippinensis – B81.1
cartilage – see Disorder, cartilage, specified type NEC
catheter-related bloodstream (CRBSI) – T80.211 (header)
cat liver fluke – B66.0
cellulitis - code by site under Cellulitis
central line-associated – T80.219 (header)
- bloodstream (CLABSI) – T80.211 (header)
- specified NEC – T80.218 (header)
Cephalosporium falciforme – B47.0
cerebrospinal – see Meningitis
cervical gland (lymph) – L04.0
cervix – see Cervicitis
cesarean delivery wound (puerperal) – O86.00
cestodes – see Infestation, cestodes
chest – J22
Chilomastix (intestinal) – A07.8
Chlamydia, chlamydial – A74.9
- anus – A56.3
- genitourinary tract – A56.2
  - lower – A56.00
  - specified NEC – A56.19
- lymphogranuloma – A55
- pharynx – A56.4
- psittaci – A70
- rectum – A56.3
- sexually transmitted NEC – A56.8
cholera – see Cholera
Cladosporium
- bantianum (brain abscess) – B43.1
- carrionii – B43.0
- castellanii – B36.1
- trichoides (brain abscess) – B43.1
- werneckii – B36.1
Clonorchis (sinensis) (liver) – B66.1
Clostridioides
- difficile
  - as cause of disease classified elsewhere – B96.89
  - foodborne (disease)
    - not specified as recurrent – A04.72
    - recurrent – A04.71
  - gas gangrene – A48.0
  - necrotizing enterocolitis
    - not specified as recurrent – A04.72
    - recurrent – A04.71
  - sepsis – A41.4
Clostridium NEC
- bifermentans – A48.0
- botulinum (food poisoning) – A05.1
  - infant – A48.51
  - wound – A48.52
- difficile
  - as cause of disease classified elsewhere – B96.89
  - foodborne (disease)
    - not specified as recurrent – A04.72
    - recurrent – A04.71
  - gas gangrene – A48.0
  - necrotizing enterocolitis
    - not specified as recurrent – A04.72
    - recurrent – A04.71
  - sepsis – A41.4
- gas-forming NEC – A48.0
- histolyticum – A48.0
- novyi, causing gas gangrene – A48.0
- oedematiens – A48.0
- perfringens
  - as cause of disease classified elsewhere – B96.7
  - due to food – A05.2
  - foodborne (disease) – A05.2
  - gas gangrene – A48.0
  - sepsis – A41.4
- septicum, causing gas gangrene – A48.0
- sordellii, causing gas gangrene – A48.0
- welchii
  - as cause of disease classified elsewhere – B96.7
  - foodborne (disease) – A05.2
  - gas gangrene – A48.0
  - necrotizing enteritis – A05.2
  - sepsis – A41.4
Coccidioides (immitis) – see Coccidioidomycosis
colon – see Enteritis, infectious
colostomy – K94.02
common duct – see Cholangitis
congenital – P39.9
- Candida (albicans) – P37.5
- cytomegalovirus – P35.1
- hepatitis, viral – P35.3
- herpes simplex – P35.2
- infectious or parasitic disease – P37.9
  - specified NEC – P37.8
- listeriosis (disseminated) – P37.2
- malaria NEC – P37.4
  - falciparum – P37.3
- Plasmodium falciparum – P37.3
- poliomyelitis – P35.8
- rubella – P35.0
- skin – P39.4
- toxoplasmosis (acute) (subacute) (chronic) – P37.1
- tuberculosis – P37.0
- urinary (tract) – P39.3
- vaccinia – P35.8
- virus – P35.9
  - specified type NEC – P35.8
Conidiobolus – B46.8
coronavirus-2019 – U07.1
coronavirus NEC – B34.2
- as cause of disease classified elsewhere – B97.29
- severe acute respiratory syndrome (SARS associated) – B97.21
corpus luteum – see Salpingo-oophoritis
Corynebacterium diphtheriae – see Diphtheria
cotia virus – B08.8
COVID-19 – U07.1 – see also COVID-19
Coxiella burnetii – A78
coxsackie – see Coxsackie
Cronobacter (sakazakii) – A49.8
- as cause of disease classified elsewhere – B96.89
- generalized – A41.59
Cryptococcus neoformans – see Cryptococcosis
Cryptosporidium – A07.2
Cunninghamella – see Mucormycosis
cyst – see Cyst
cystic duct – K81.9 – see also Cholecystitis
Cysticercus cellulosae – see Cysticercosis
cytomegalovirus, cytomegaloviral – B25.9
- congenital – P35.1
- maternal, maternal care for (suspected) – O35.3 (header)
- mononucleosis – B27.10
  - with
    - complication NEC – B27.19
    - meningitis – B27.12
    - polyneuropathy – B27.11
delta-agent (acute) – B17.0
dental (pulpal origin) – K04.7
Deuteromycetes – B47.0
Dicrocoelium dendriticum – B66.2
Dipetalonema (perstans) (streptocerca) – B74.4
diphtherial – see Diphtheria
Diphyllobothrium (adult) (latum) (pacificum) – B70.0
- larval – B70.1
Diplogonoporus (grandis) – B71.8
Dipylidium caninum – B67.4
Dirofilaria – B74.8
Dracunculus medinensis – B72
Drechslera (hawaiiensis) – B43.8
ducreyi Haemophilus (any location) – A57
due to or resulting from
- artificial insemination – N98.0
- Babesia
  - divergens (-like) – B60.03
  - duncani (-type) – B60.02
  - microti – B60.01
  - species
    - specified NEC – B60.09
- central venous catheter – T80.219 (header)
  - bloodstream – T80.211 (header)
  - exit or insertion site – T80.212 (header)
  - localized – T80.212 (header)
  - port or reservoir – T80.212 (header)
  - specified NEC – T80.218 (header)
  - tunnel – T80.212 (header)
- device, implant or graft – T85.79 (header) – see also Complications, by site and type, infection or inflammation
  - arterial graft NEC – T82.7 (header)
  - breast (implant) – T85.79 (header)
  - catheter NEC – T85.79 (header)
    - dialysis (renal) – T82.7 (header)
      - central line – T80.211 (header)
      - intraperitoneal – T85.71 (header)
    - infusion NEC – T82.7 (header)
      - cranial – T85.735 (header)
      - intrathecal – T85.735 (header)
      - spinal (epidural) (subdural) – T85.735 (header)
      - subarachnoid – T85.735 (header)
    - urinary – T83.518 (header)
      - cystostomy – T83.510 (header)
      - Hopkins – T83.518 (header)
      - ileostomy – T83.518 (header)
      - nephrostomy – T83.512 (header)
      - specified NEC – T83.518 (header)
      - urethral indwelling – T83.511 (header)
      - urostomy – T83.518 (header)
  - electronic (electrode) (pulse generator) (stimulator)
    - bone – T84.7 (header)
    - cardiac – T82.7 (header)
    - nervous system – T85.738 (header)
      - brain – T85.731 (header)
      - cranial nerve – T85.732 (header)
      - gastric nerve – T85.732 (header)
      - generator pocket – T85.734 (header)
      - neurostimulator generator – T85.734 (header)
      - peripheral nerve – T85.732 (header)
      - sacral nerve – T85.732 (header)
      - spinal cord – T85.733 (header)
      - vagal nerve – T85.732 (header)
    - urinary – T83.590 (header)
  - fixation, internal (orthopedic) – see Complication, fixation device, infection
  - gastrointestinal (bile duct) (esophagus) – T85.79 (header)
    - neurostimulator electrode (lead) – T85.732 (header)
  - genital NEC – T83.69 (header)
  - heart NEC – T82.7 (header)
    - valve (prosthesis) – T82.6 (header)
      - graft – T82.7 (header)
  - joint prosthesis – see Complication, joint prosthesis, infection
  - ocular (corneal graft) (orbital implant) – T85.79 (header)
  - orthopedic NEC – T84.7 (header)
  - penile (cylinder) (pump) (reservoir) – T83.61 (header)
  - specified NEC – T85.79 (header)
  - testicular – T83.62 (header)
  - urinary NEC – T83.598 (header)
    - ileal conduit stent – T83.593 (header)
    - implanted neurostimulation – T83.590 (header)
    - implanted sphincter – T83.591 (header)
    - indwelling ureteral stent – T83.592 (header)
    - nephroureteral stent – T83.593 (header)
    - specified stent NEC – T83.593 (header)
  - vascular NEC – T82.7 (header)
  - ventricular intracranial (communicating) – T85.730 (header)
- Hickman catheter – T80.219 (header)
  - bloodstream – T80.211 (header)
  - localized – T80.212 (header)
  - specified NEC – T80.218 (header)
- immunization or vaccination – T88.0 (header)
- infusion, injection or transfusion NEC – T80.29 (header)
  - acute – T80.22 (header)
- injury NEC - code by site under Wound, open
- peripherally inserted central catheter (PICC) – T80.219 (header)
  - bloodstream – T80.211 (header)
  - localized – T80.212 (header)
  - specified NEC – T80.218 (header)
- portacath (port-a-cath) – T80.219 (header)
  - bloodstream – T80.211 (header)
  - localized – T80.212 (header)
  - specified NEC – T80.218 (header)
- protozoa of the order Piroplasmida NEC – B60.09
- pulmonary artery catheter – see Infection, due to or resulting from, central venous catheter
- surgery – T81.40 (header)
- Swan Ganz catheter – see Infection, due to or resulting from, central venous catheter
- triple lumen catheter – T80.219 (header)
  - bloodstream – T80.211 (header)
  - localized – T80.212 (header)
  - specified NEC – T80.218 (header)
- umbilical venous catheter – T80.219 (header)
  - bloodstream – T80.211 (header)
  - localized – T80.212 (header)
  - specified NEC – T80.218 (header)
during labor NEC – O75.3
ear (middle) – see also Otitis media
- external – see Otitis, externa, infective
- inner
Eberthella typhosa – A01.00
Echinococcus – see Echinococcus
echovirus
- as cause of disease classified elsewhere – B97.12
- unspecified nature or site – B34.1
endocardium – I33.0
endocervix – see Cervicitis
Entamoeba – see Amebiasis
enteric – see Enteritis, infectious
Enterobacter sakazakii – B96.89
Enterobius vermicularis – B80
enterostomy – K94.12
enterovirus – B34.1
- as cause of disease classified elsewhere – B97.10
  - coxsackievirus – B97.11
  - echovirus – B97.12
  - specified NEC – B97.19
Entomophthora – B46.8
Epidermophyton – see Dermatophytosis
epididymis – see Epididymitis
episiotomy (puerperal) – O86.09
Erysipelothrix (insidiosa) (rhusiopathiae) – see Erysipeloid
erythema infectiosum – B08.3
Escherichia (E.) – A49.8
- as cause of disease classified elsewhere – B96.20 – see also Escherichia coli
- congenital – P39.8
  - sepsis – P36.4
- generalized – A41.51
- intestinal – see Enteritis, infectious, due to, Escherichia coli
ethmoidal (chronic) (sinus) – see Sinusitis, ethmoidal
eustachian tube (ear) – see Salpingitis, eustachian
external auditory canal (meatus) – see Otitis, externa, infective
eye (purulent) – see Endophthalmitis, purulent
eyelid – see Inflammation, eyelid
fallopian tube – see Salpingo-oophoritis
Fasciola (gigantica) (hepatica) (indica) – B66.3
Fasciolopsis (buski) – B66.5
filarial – see Infestation, filarial
finger (skin) – L08.9
- nail – L03.01- (header)
  - fungus – B35.1
fish tapeworm – B70.0
- larval – B70.1
flagellate, intestinal – A07.9
fluke – see Infestation, fluke
focal
- teeth (pulpal origin) – K04.7
- tonsils – J35.01
Fonsecaea (compactum) (pedrosoi) – B43.0
food – see Intoxication, foodborne
foot (skin) – L08.9
- dermatophytic fungus – B35.3
Francisella tularensis – see Tularemia
frontal (sinus) (chronic) – see Sinusitis, frontal
fungus NOS – B49
- beard – B35.0
- dermatophytic – see Dermatophytosis
- foot – B35.3
- groin – B35.6
- hand – B35.2
- nail – B35.1
- pathogenic to compromised host only – B48.8
- perianal (area) – B35.6
- scalp – B35.0
- skin – B36.9
  - foot – B35.3
  - hand – B35.2
  - toenails – B35.1
Fusarium – B48.8
gallbladder – see Cholecystitis
gas bacillus – see Gangrene, gas
gastrointestinal – see Enteritis, infectious
generalized NEC – see Sepsis
generator pocket, implanted electronic neurostimulator – T85.734 (header)
genital organ or tract
- female – see Disease, pelvis, inflammatory
- male – N49.9
  - multiple sites – N49.8
  - specified NEC – N49.8
Ghon tubercle, primary – A15.7
Giardia lamblia – A07.1
gingiva (chronic) – K05.10
- acute – K05.00
  - nonplaque induced – K05.01
  - plaque induced – K05.00
- nonplaque induced – K05.11
- plaque induced – K05.10
glanders – A24.0
glenosporopsis – B48.0
Gnathostoma (spinigerum) – B83.1
Gongylonema – B83.8
gonococcal – see Gonococcus
gram-negative bacilli NOS – A49.9
guinea worm – B72
gum (chronic) – K05.10
- acute – K05.00
  - nonplaque induced – K05.01
  - plaque induced – K05.00
- nonplaque induced – K05.11
- plaque induced – K05.10
Haemophilus – see Infection, Hemophilus
heart – see Carditis
Helicobacter pylori – A04.8
- as cause of disease classified elsewhere – B96.81
helminths – B83.9
- intestinal – B82.0
  - mixed (types classifiable to more than one of the titles B65.0-B81.3 and B81.8) – B81.4
  - specified type NEC – B81.8
- specified type NEC – B83.8
Hemophilus
- aegyptius, systemic – A48.4
- ducreyi (any location) – A57
- influenzae NEC – A49.2
  - as cause of disease classified elsewhere – B96.3
- generalized – A41.3
herpes (simplex) – see also Herpes
- congenital – P35.2
- disseminated – B00.7
- zoster – B02.9
herpesvirus, herpesviral – see Herpes
hip (joint) – M00.9
- due to internal joint prosthesis
  - left – T84.52 (header)
  - right – T84.51 (header)
- skin NEC – L08.9
Heterophyes (heterophyes) – B66.8
Histoplasma – see Histoplasmosis
- American – B39.4
- capsulatum – B39.4
hookworm – B76.9
human
- papilloma virus – A63.0
- T-cell lymphotropic virus type-1 (HTLV-1) – B33.3
hydrocele – N43.0
Hymenolepis – B71.0
hypopharynx – see Pharyngitis
inguinal (lymph) – L04.1
- due to soft chancre – A57
intervertebral disc, pyogenic – M46.30
- cervical region – M46.32
- cervicothoracic region – M46.33
- lumbar region – M46.36
- lumbosacral region – M46.37
- multiple sites – M46.39
- occipito-atlanto-axial region – M46.31
- sacrococcygeal region – M46.38
- thoracic region – M46.34
- thoracolumbar region – M46.35
intestine, intestinal – see Enteritis, infectious
- specified NEC – A08.8
intra-amniotic affecting newborn NEC – P39.2
intrauterine inflammation – O41.12- (header)
Isospora belli or hominis – A07.3
Japanese B encephalitis – A83.0
jaw (bone) (lower) (upper) – M27.2
joint NEC – M00.9
- due to internal joint prosthesis – T84.50 (header)
kidney (cortex) (hematogenous) – N15.9
- with calculus – N20.0
  - with hydronephrosis – N13.6
- following ectopic gestation – O08.83
- pelvis and ureter (cystic) – N28.85
- puerperal (postpartum) – O86.21
- specified NEC – N15.8
Klebsiella (K.) – A49.8
- as cause of disease classified elsewhere – B96.1
knee (joint) – M00.9
- joint – M00.9
- due to internal joint prosthesis
  - left – T84.54 (header)
  - right – T84.53 (header)
- skin – L08.9
Koch's – see Tuberculosis
labia (majora) (minora) (acute) – see Vulvitis
lacrimal
- gland – see Dacryoadenitis
- passages (duct) (sac) – see Inflammation, lacrimal, passages
lancet fluke – B66.2
larynx NEC – J38.7
leg (skin) – L08.9
Legionella pneumophila – A48.1
- nonpneumonic – A48.2
Leishmania – see also Leishmaniasis
- aethiopica – B55.1
- braziliensis – B55.2
- chagasi – B55.0
- donovani – B55.0
- infantum – B55.0
- major – B55.1
- mexicana – B55.1
- tropica – B55.1
lentivirus, as cause of disease classified elsewhere – B97.31
Leptosphaeria senegalensis – B47.0
Leptospira interrogans – A27.9
- autumnalis – A27.89
- canicola – A27.89
- hebdomadis – A27.89
- icterohaemorrhagiae – A27.0
- pomona – A27.89
- specified type NEC – A27.89
leptospirochetal NEC – see Leptospirosis
Listeria monocytogenes – see also Listeriosis
- congenital – P37.2
Loa loa – B74.3
- with conjunctival infestation – B74.3
- eyelid – B74.3
Loboa loboi – B48.0
local, skin (staphylococcal) (streptococcal) – L08.9
- abscess - code by site under Abscess
- cellulitis - code by site under Cellulitis
- specified NEC – L08.89
- ulcer – see Ulcer, skin
Loefflerella mallei – A24.0
lung – J18.9 – see also Pneumonia
- atypical Mycobacterium – A31.0
- spirochetal – A69.8
- tuberculous – see Tuberculosis, pulmonary
- virus – see Pneumonia, viral
lymph gland – see also Lymphadenitis, acute
- mesenteric – I88.0
lymphoid tissue, base of tongue or posterior pharynx, NEC (chronic) – J35.03
Madurella (grisea) (mycetomii) – B47.0
major
- following ectopic or molar pregnancy – O08.0
- puerperal, postpartum, childbirth – O85
Malassezia furfur – B36.0
Malleomyces
- mallei – A24.0
- pseudomallei (whitmori) – see Melioidosis
mammary gland – N61.0
Mansonella (ozzardi) (perstans) (streptocerca) – B74.4
mastoid – see Mastoiditis
maxilla, maxillary – M27.2
- sinus (chronic) – see Sinusitis, maxillary
mediastinum – J98.51
Medina (worm) – B72
meibomian cyst or gland – see Hordeolum
meninges – see Meningitis, bacterial
meningococcal – A39.9 – see also condition
- adrenals – A39.1
- brain – A39.81
- cerebrospinal – A39.0
- conjunctiva – A39.89
- endocardium – A39.51
- heart – A39.50
  - endocardium – A39.51
  - myocardium – A39.52
  - pericardium – A39.53
- joint – A39.83
- meninges – A39.0
- meningococcemia – A39.4
  - acute – A39.2
  - chronic – A39.3
- myocardium – A39.52
- pericardium – A39.53
- retrobulbar neuritis – A39.82
- specified site NEC – A39.89
mesenteric lymph nodes or glands NEC – I88.0
Metagonimus – B66.8
metatarsophalangeal – M00.9
methicillin
- resistant Staphylococcus aureus (MRSA) – A49.02
- susceptible Staphylococcus aureus (MSSA) – A49.01
Microsporum, microsporic – see Dermatophytosis
mixed flora (bacterial) – A49.8
Monilia – see Candidiasis
Monosporium apiospermum – B48.2
mouth, parasitic – B37.0
Mucor – see Mucormycosis
muscle NEC – see Myositis, infective
mycelium NOS – B49
mycetoma – B47.9
- actinomycotic NEC – B47.1
- mycotic NEC – B47.0
Mycobacterium, mycobacterial – see Mycobacterium
Mycoplasma NEC – A49.3
- pneumoniae, as cause of disease classified elsewhere – B96.0
mycotic NOS – B49
- pathogenic to compromised host only – B48.8
- skin NOS – B36.9
myocardium NEC – I40.0
nail (chronic)
- with lymphangitis – see Lymphangitis, acute, digit
- finger – L03.01- (header)
  - fungus – B35.1
- ingrowing – L60.0
- toe – L03.03- (header)
  - fungus – B35.1
nasal sinus (chronic) – see Sinusitis
nasopharynx – see Nasopharyngitis
navel – L08.82
Necator americanus – B76.1
Neisseria – see Gonococcus
Neotestudina rosatii – B47.0
newborn – P39.9
- intra-amniotic NEC – P39.2
- skin – P39.4
- specified type NEC – P39.8
nipple – N61.0
- associated with
  - lactation – O91.03
  - pregnancy – O91.01- (header)
  - puerperium – O91.02
Nocardia – see Nocardiosis
obstetrical surgical wound (puerperal) – O86.00
- incisional site
  - deep – O86.02
  - superficial – O86.01
- organ and space site – O86.03
- surgical site specified NEC – O86.09
Oesophagostomum (apiostomum) – B81.8
Oestrus ovis – see Myiasis
Oidium albicans – B37.9
Onchocerca (volvulus) – see Onchocerciasis
oncovirus, as cause of disease classified elsewhere – B97.32
operation wound – T81.49 (header)
Opisthorchis (felineus) (viverrini) – B66.0
orbit, orbital – see Inflammation, orbit
orthopoxvirus NEC – B08.09
ovary – see Salpingo-oophoritis
Oxyuris vermicularis – B80
pancreas (acute) – see Pancreatitis, acute
- abscess – see Pancreatitis, acute
- specified NEC – K85.80 – see also Pancreatitis, acute
papillomavirus, as cause of disease classified elsewhere – B97.7
papovavirus NEC – B34.4
Paracoccidioides brasiliensis – see Paracoccidioidomycosis
Paragonimus (westermani) – B66.4
parainfluenza virus – B34.8
parameningococcus NOS – A39.9
parapoxvirus – B08.60
- specified NEC – B08.69
parasitic – B89
Parastrongylus
- cantonensis – B83.2
- costaricensis – B81.3
- paratyphoid – A01.4
  - Type A – A01.1
  - Type B – A01.2
  - Type C – A01.3
paraurethral ducts – N34.2
parotid gland – see Sialoadenitis
parvovirus NEC – B34.3
- as cause of disease classified elsewhere – B97.6
Pasteurella NEC – A28.0
- multocida – A28.0
- pestis – see Plague
- pseudotuberculosis – A28.0
- septica (cat bite) (dog bite) – A28.0
- tularensis – see Tularemia
pelvic, female – see Disease, pelvis, inflammatory
Penicillium (marneffei) – B48.4
penis (glans) (retention) – N48.29
periapical – K04.5
peridental, periodontal – K05.20
- generalized – see Periodontitis, aggressive, generalized
- localized – see Periodontitis, aggressive, localized
perinatal period – P39.9
- specified type NEC – P39.8
perineal repair (puerperal) – O86.09
periorbital – see Inflammation, orbit
perirectal – K62.89
perirenal – see Infection, kidney
peritoneal – see Peritonitis
periureteral – N28.89
Petriellidium boydii – B48.2
pharynx – see also Pharyngitis
- coxsackievirus – B08.5
- posterior, lymphoid (chronic) – J35.03
Phialophora
- gougerotii (subcutaneous abscess or cyst) – B43.2
- jeanselmei (subcutaneous abscess or cyst) – B43.2
- verrucosa (skin) – B43.0
Piedraia hortae – B36.3
pinta – A67.9
- intermediate – A67.1
- late – A67.2
- mixed – A67.3
- primary – A67.0
pinworm – B80
pityrosporum furfur – B36.0
pleuro-pneumonia-like organism (PPLO) – A49.3
- as cause of disease classified elsewhere – B96.0
pneumococcus, pneumococcal NEC – A49.1
- as cause of disease classified elsewhere – B95.3
- generalized (purulent) – A40.3
  - with pneumonia – J13
Pneumocystis carinii (pneumonia) – B59
Pneumocystis jirovecii (pneumonia) – B59
port or reservoir – T80.212 (header)
postoperative – T81.40 (header)
postoperative wound – T81.49 (header)
- surgical site
  - deep incisional – T81.42 (header)
  - organ and space – T81.43 (header)
  - specified NEC – T81.49 (header)
  - superficial incisional – T81.41 (header)
postprocedural – T81.40 (header)
postvaccinal – T88.0 (header)
prepuce NEC – N47.7
- with penile inflammation – N47.6
prion – see Disease, prion, central nervous system
prostate (capsule) – see Prostatitis
Proteus (mirabilis) (morganii) (vulgaris) – A49.8
- as cause of disease classified elsewhere – B96.4
protozoal NEC – B64
- intestinal – A07.9
  - specified NEC – A07.8
- specified NEC – B60.8
Pseudoallescheria boydii – B48.2
Pseudomonas NEC – A49.8
- as cause of disease classified elsewhere – B96.5
- generalized – A41.52
- mallei – A24.0
- pneumonia – J15.1
- pseudomallei – see Melioidosis
puerperal – O86.4
- genitourinary tract NEC – O86.89
- major or generalized – O85
- minor – O86.4
- specified NEC – O86.89
pulmonary – see Infection, lung
purulent – see Abscess
Pyrenochaeta romeroi – B47.0
Q fever – A78
rectum (sphincter) – K62.89
renal – see also Infection, kidney
- pelvis and ureter (cystic) – N28.85
reovirus, as cause of disease classified elsewhere – B97.5
respiratory (tract) – J98.8
- acute – J22
- chronic – J98.8
- influenzal (upper) (acute) – see Influenza, with, respiratory manifestations NEC
- lower (acute) – J22
  - chronic – see Bronchitis, chronic
- rhinovirus – J00
- syncytial virus (RSV) – see Infection, virus, respiratory syncytial (RSV)
- upper (acute) – J06.9
  - chronic – J39.8
  - streptococcal – J06.9
  - viral NOS – J06.9
    - due to respiratory syncytial virus (RSV) – J06.9 – B97.4 [manifestation]
resulting from
- presence of internal prosthesis, implant, graft – see Complications, by site and type, infection
retortamoniasis – A07.8
retroperitoneal NEC – K68.9
retrovirus – B33.3
- as cause of disease classified elsewhere – B97.30
  - human
    - immunodeficiency, type 2 (HIV 2) – B97.35
    - T-cell lymphotropic
      - type I (HTLV-I) – B97.33
      - type II (HTLV-II) – B97.34
  - lentivirus – B97.31
  - oncovirus – B97.32
  - specified NEC – B97.39
Rhinosporidium (seeberi) – B48.1
rhinovirus
- as cause of disease classified elsewhere – B97.89
- unspecified nature or site – B34.8
Rhizopus – see Mucormycosis
rickettsial NOS – A79.9
roundworm (large) – B82.0
- Ascariasis – B77.9 – see also Ascariasis
rubella – see Rubella
Saccharomyces – see Candidiasis
salivary duct or gland (any) – see Sialoadenitis
Salmonella (aertrycke) (arizonae) (cholerae-suis) (enteritidis) (gallinarum) (suipestifer) (typhimurium) – A02.9
- with
  - (gastro) – A02.0
  - sepsis – A02.1
  - specified manifestation NEC – A02.8
- due to food (poisoning) – A02.9
- hirschfeldii – A01.3
- localized – A02.20
  - arthritis – A02.23
  - meningitis – A02.21
  - osteomyelitis – A02.24
  - pneumonia – A02.22
  - pyelonephritis – A02.25
  - specified NEC – A02.29
- paratyphi – A01.4
  - A – A01.1
  - B – A01.2
  - C – A01.3
- schottmuelleri – A01.2
- typhi, typhosa – see Typhoid
Sarcocystis – A07.8
SARS-CoV-2 – see Infection, COVID-19
scabies – B86
Schistosoma – see Infestation, Schistosoma
scrotum (acute) – N49.2
seminal vesicle – see Vesiculitis
septic
- localized, skin – see Abscess
Serratia NEC – A49.8
- as cause of disease classified elsewhere – B96.89
- generalized – A41.53
sheep liver fluke – B66.3
Shigella – A03.9
- boydii – A03.2
- dysenteriae – A03.0
- flexneri – A03.1
- group
  - A – A03.0
  - B – A03.1
  - C – A03.2
  - D – A03.3
- Schmitz (-Stutzer) – A03.0
- schmitzii – A03.0
- shigae – A03.0
- sonnei – A03.3
- specified NEC – A03.8
shoulder (joint) – M00.9
- due to internal joint prosthesis – T84.59 (header)
- skin NEC – L08.9
sinus (accessory) (chronic) (nasal) – see also Sinusitis
- pilonidal – see Sinus, pilonidal
- skin NEC – L08.89
Skene's duct or gland – see Urethritis
skin (local) (staphylococcal) (streptococcal) – L08.9
- abscess - code by site under Abscess
- cellulitis - code by site under Cellulitis
- due to fungus – B36.9
  - specified type NEC – B36.8
- mycotic – B36.9
  - specified type NEC – B36.8
- newborn – P39.4
- ulcer – see Ulcer, skin
slow virus – A81.9
- specified NEC – A81.89
Sparganum (mansoni) (proliferum) (baxteri) – B70.1
specific – see also Syphilis
- to perinatal period – see Infection, congenital
specified NEC – B99.8
spermatic cord NEC – N49.1
sphenoidal (sinus) – see Sinusitis, sphenoidal
spinal cord NOS – G04.91 – see also Myelitis
- abscess – G06.1
- meninges – see Meningitis
- streptococcal – G04.89
Spirillum – A25.0
spirochetal NOS – A69.9
- lung – A69.8
- specified NEC – A69.8
Spirometra larvae – B70.1
spleen – D73.89
Sporotrichum, Sporothrix (schenckii) – see Sporotrichosis
staphylococcal, unspecified site
- aureus (methicillin susceptible) (MSSA) – A49.01
  - methicillin resistant (MRSA) – A49.02
- as cause of disease classified elsewhere – B95.8
  - aureus (methicillin susceptible) (MSSA) – B95.61
    - methicillin resistant (MRSA) – B95.62
  - specified NEC – B95.7
- food poisoning – A05.0
- generalized (purulent) – A41.2
- pneumonia – see Pneumonia, staphylococcal
Stellantchasmus falcatus – B66.8
streptobacillus moniliformis – A25.1
streptococcal NEC – A49.1
- as cause of disease classified elsewhere – B95.5
- B genitourinary complicating
  - childbirth – O98.82
  - pregnancy – O98.81- (header)
  - puerperium – O98.83
- congenital
  - sepsis – P36.10
    - group B – P36.0
    - specified NEC – P36.19
- generalized (purulent) – A40.9
Streptomyces – B47.1
Strongyloides (stercoralis) – see Strongyloidiasis
stump (amputation) (surgical) – see Complication, amputation stump, infection
subcutaneous tissue, local – L08.9
suipestifer – see Infection, salmonella
swimming pool bacillus – A31.1
Taenia – see Infestation, Taenia
Taeniarhynchus saginatus – B68.1
tapeworm – see Infestation, tapeworm
tendon (sheath) – see Tenosynovitis, infective NEC
Ternidens diminutus – B81.8
testis – see Orchitis
threadworm – B80
throat – see Pharyngitis
thyroglossal duct – K14.8
toe (skin) – L08.9
- cellulitis – L03.03- (header)
  - fungus – B35.1
- nail – L03.03- (header)
  - fungus – B35.1
tongue NEC – K14.0
- parasitic – B37.0
tonsil (and adenoid) (faucial) (lingual) (pharyngeal) – see Tonsillitis
tooth, teeth – K04.7
- periapical – K04.7
- peridental, periodontal – K05.20
  - generalized – see Periodontitis, aggressive, generalized
  - localized – see Periodontitis, aggressive, localized
- pulp – K04.01
  - irreversible – K04.02
  - reversible – K04.01
- socket – M27.3
TORCH – see Infection, congenital
- without active infection – P00.2
Torula histolytica – see Cryptococcosis
Toxocara (canis) (cati) (felis) – B83.0
Toxoplasma gondii – see Toxoplasma
trachea, chronic – J42
trematode NEC – see Infestation, fluke
trench fever – A79.0
Treponema pallidum – see Syphilis
Trichinella (spiralis) – B75
Trichomonas – A59.9
- cervix – A59.09
- intestine – A07.8
- prostate – A59.02
- specified site NEC – A59.8
- urethra – A59.03
- urogenitalis – A59.00
- vagina – A59.01
- vulva – A59.01
Trichophyton, trichophytic – see Dermatophytosis
Trichosporon (beigelii) – B36.2
Trichostrongylus – B81.2
Trichuris (trichiura) – B79
Trombicula (irritans) – B88.09
Trypanosoma
- brucei
  - gambiense – B56.0
  - rhodesiense – B56.1
- cruzi – see Chagas' disease
tubal – see Salpingo-oophoritis
tuberculous
- latent (LTBI) – Z22.7
- NEC – see Tuberculosis
tubo-ovarian – see Salpingo-oophoritis
tunnel – T80.212 (header)
tunica vaginalis – N49.1
tympanic membrane NEC – see Myringitis
typhoid (abortive) (ambulant) (bacillus) – see Typhoid
typhus – A75.9
- flea-borne – A75.2
- mite-borne – A75.3
- recrudescent – A75.1
- tick-borne – A77.9
  - African – A77.1
  - North Asian – A77.2
umbilicus – L08.82
ureter – see Ureteritis
urethra – see Urethritis
urinary (tract) – N39.0
- bladder – see Cystitis
- complicating
  - pregnancy – O23.4- (header)
    - specified type NEC – O23.3- (header)
- kidney – see Infection, kidney
- newborn – P39.3
- puerperal (postpartum) – O86.20
- tuberculous – A18.13
- urethra – see Urethritis
uterus, uterine – see Endometritis
vaccination – T88.0 (header)
vaccinia not from vaccination – B08.011
vagina (acute) – see Vaginitis
varicella – B01.9
varicose veins – see Varix
vas deferens NEC – N49.1
vesical – see Cystitis
Vibrio
- cholerae – A00.0
  - El Tor – A00.1
- parahaemolyticus (food poisoning) – A05.3
- vulnificus
  - as cause of disease classified elsewhere – B96.82
  - foodborne intoxication – A05.5
Vincent's (gum) (mouth) (tonsil) – A69.1
virus, viral NOS – B34.9
- adenovirus
  - as cause of disease classified elsewhere – B97.0
  - unspecified nature or site – B34.0
- arborvirus, arbovirus arthropod-borne – A94
- as cause of disease classified elsewhere – B97.89
  - adenovirus – B97.0
  - coronavirus – B97.29
    - SARS-associated – B97.21
  - coxsackievirus – B97.11
  - echovirus – B97.12
  - enterovirus – B97.10
    - coxsackievirus – B97.11
    - echovirus – B97.12
    - specified NEC – B97.19
  - human
    - immunodeficiency, type 2 (HIV 2) – B97.35
    - T-cell lymphotropic,
      - type I (HTLV-I) – B97.33
      - type II (HTLV-II) – B97.34
    - metapneumovirus – B97.81
  - papillomavirus – B97.7
  - parvovirus – B97.6
  - reovirus – B97.5
  - respiratory syncytial (RSV) – see Infection, virus, respiratory syncytial (RSV)
  - retrovirus – B97.30
    - human
      - immunodeficiency, type 2 (HIV 2) – B97.35
      - T-cell lymphotropic,
        type I (HTLV-I) – B97.33
        type II (HTLV-II) – B97.34
    - lentivirus – B97.31
    - oncovirus – B97.32
    - specified NEC – B97.39
  - specified NEC – B97.89
- central nervous system – A89
  - atypical – A81.9
    - specified NEC – A81.89
  - enterovirus NEC – A88.8
    - meningitis – A87.0
  - slow virus – A81.9
    - specified NEC – A81.89
  - specified NEC – A88.8
- chest – J98.8
- cotia – B08.8
- COVID-19 – U07.1
- coxsackie – B34.1 – see also Infection, coxsackie
  - as cause of disease classified elsewhere – B97.11
- ECHO
  - as cause of disease classified elsewhere – B97.12
  - unspecified nature or site – B34.1
- encephalitis, tick-borne – A84.9
- enterovirus, as cause of disease classified elsewhere – B97.10
  - coxsackievirus – B97.11
  - echovirus – B97.12
  - specified NEC – B97.19
- exanthem NOS – B09
- human papilloma as cause of disease classified elsewhere – B97.7
- human metapneumovirus as cause of disease classified elsewhere – B97.81
- intestine – see Enteritis, viral
- respiratory syncytial (RSV)
  - as cause of disease classified elsewhere – B97.4
  - bronchiolitis – J21.0
  - bronchitis – J20.5
  - bronchopneumonia – J12.1
  - otitis media – H65.- (header) – B97.4 [manifestation]
  - pneumonia – J12.1
  - upper respiratory infection – J06.9 – B97.4 [manifestation]
- rhinovirus
  - as cause of disease classified elsewhere – B97.89
  - unspecified nature or site – B34.8
- slow – A81.9
  - specified NEC – A81.89
- specified type NEC – B33.8
  - as cause of disease classified elsewhere – B97.89
  - unspecified nature or site – B34.8
- unspecified nature or site – B34.9
- West Nile – see Virus, West Nile
vulva (acute) – see Vulvitis
West Nile – see Virus, West Nile
whipworm – B79
worms – B83.9
- specified type NEC – B83.8
Wuchereria (bancrofti) – B74.0
- malayi – B74.1
yatapoxvirus – B08.70
- specified NEC – B08.79
yeast – B37.9 – see also Candidiasis
yellow fever – see Fever, yellow
Yersinia
- enterocolitica (intestinal) – A04.6
- pestis – see Plague
- pseudotuberculosis – A28.2
Zeis' gland – see Hordeolum
Zika virus – A92.5
- congenital – P35.4
zoonotic bacterial NOS – A28.9
Zopfia senegalensis – B47.0

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.