ICD-10 Code for Pericarditis

The default ICD-10-CM 2027 code for pericarditis (with decompensation) (with effusion) is I31.9 – Disease of pericardium, unspecified. More specific codes depend on the details documented, as listed in the official index (20 codes, 20 billable).

Main code: I31.9 – Disease of pericardium, unspecified
Billable: Yes

Index entries for Pericarditis

with rheumatic fever (conditions in I00)
- active – see Pericarditis, rheumatic
- inactive or quiescent – I09.2
acute (hemorrhagic) (nonrheumatic) (Sicca) – I30.9
- with chorea (acute) (rheumatic) (Sydenham's) – I02.0
- benign – I30.8
- nonspecific – I30.0
- rheumatic – I01.0
  - with chorea (acute) (Sydenham's) – I02.0
adhesive or adherent (chronic) (external) (internal) – I31.0
- acute – see Pericarditis, acute
- rheumatic – I09.2
bacterial (acute) (subacute) (with serous or seropurulent effusion) – I30.1
calcareous – I31.1
cholesterol (chronic) – I31.8
- acute – I30.9
chronic (nonrheumatic) – I31.9
- rheumatic – I09.2
constrictive (chronic) – I31.1
coxsackie – B33.23
fibrinocaseous (tuberculous) – A18.84
fibrinopurulent – I30.1
fibrinous – I30.8
fibrous – I31.0
gonococcal – A54.83
idiopathic – I30.0
in systemic lupus erythematosus – M32.12
infective – I30.1
meningococcal – A39.53
neoplastic (chronic) – I31.8
- acute – I30.9
obliterans, obliterating – I31.0
plastic – I31.0
pneumococcal – I30.1
postinfarction – I24.1
purulent – I30.1
rheumatic (active) (acute) (with effusion) (with pneumonia) – I01.0
- with chorea (acute) (rheumatic) (Sydenham's) – I02.0
- chronic or inactive (with chorea) – I09.2
rheumatoid – see Rheumatoid, carditis
septic – I30.1
serofibrinous – I30.8
staphylococcal – I30.1
streptococcal – I30.1
suppurative – I30.1
syphilitic – A52.06
tuberculous – A18.84
uremic – N18.9 – I32 [manifestation]
viral – I30.1

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.