J18 – Pneumonia, unspecified organism

ICD-10-CM 2027 diagnosis code · Influenza and pneumonia

Non-billable header

ICD-10-CM code J18
Code
J18 (claims format: J18)
Description
Pneumonia, unspecified organism
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
10. Diseases of the respiratory system (J00-J99)
Block
J09-J18 Influenza and pneumonia

Billable codes under J18

J18 is a header code and cannot be used on claims. Choose the most specific code:

Notes for J18

Excludes1 (not coded here):
  • congenital pneumonia (P23.0)
  • drug-induced interstitial lung disorder (J70.2-J70.4)
  • interstitial pneumonia NOS (J84.9)
  • neonatal aspiration pneumonia (P24.-)
  • pneumonitis due to fumes and vapors (J68.0)
  • usual interstitial pneumonia (J84.178)
Excludes2 (not included here):
  • abscess of lung with pneumonia (J85.1)
  • aspiration pneumonia due to anesthesia during labor and delivery (O74.0)
  • aspiration pneumonia due to anesthesia during pregnancy (O29)
  • aspiration pneumonia due to anesthesia during puerperium (O89.0)
  • aspiration pneumonia due to solids and liquids (J69.-)
  • aspiration pneumonia NOS (J69.0)
  • lipid pneumonia (J69.1)
  • pneumonitis due to external agents (J67-J70)
Code first:
Code also:
  • , if applicable, any associated condition such as:
  • aspiration pneumonia (J69.-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block J09-J18

Excludes2 (not included here):
  • allergic or eosinophilic pneumonia (J82)
  • aspiration pneumonia NOS (J69.0)
  • meconium pneumonia (P24.01)
  • neonatal aspiration pneumonia (P24.-)
  • pneumonia due to solids and liquids (J69.-)
  • congenital pneumonia (P23.9)
  • lipid pneumonia (J69.1)
  • rheumatic pneumonia (I00)
  • ventilator associated pneumonia (J95.851)
Use additional code:
  • code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)

Frequently asked questions

What is ICD-10 code J18?

J18 is the ICD-10-CM code for pneumonia, unspecified organism, in the block J09-J18 (Influenza and pneumonia).

Is J18 a billable code?

No. J18 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.