ICD-10-CM category J18: Pneumonia, unspecified organism

Notes that apply to every J18 code

Excludes1 (never coded together)

• 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 part of this condition, may be coded together)

• 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

• , if applicable, associated influenza (J09.X1, J10.0-, J11.0-)

Code also

• , if applicable, any associated condition such as:
• aspiration pneumonia (J69.-)

Billable codes in J18

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

• ICD-10-CM FY2027 tabular order file (category titles)
  Version FY2027 · effective 2026-10-01 · file icd10cm_order_2027.txtSHA-256 38981fb2c1226e2b…
• ICD-10-CM FY2027 tabular list (chapter titles and ranges)
  Version FY2027 · effective 2026-10-01 · file 2027-code-tables-tabular-index.zipSHA-256 37baa476323714be…
• ICD-10-CM FY2027 code descriptions addenda (codes added, deleted and revised)
  Version FY2027 · effective 2026-10-01 · file icd10cm_codes_addenda_2027.txtSHA-256 cfba025073235af4…
• ICD-10 MS-DRG Definitions Manual v44 (text)
  Version v44 · effective 2026-10-01 · file fy2027-fr-icd10-ms-drg-definitions-manual-files-v44.zipSHA-256 ae4f6c11727fe91f…
• IPPS FY2027 Tables 6A-6K: new, invalid and revised ICD-10-CM/PCS codes, CC/MCC list changes and CC exclusions
  Version FY2027 (final rule; not reissued by CN3) · effective 2026-10-01 · file fy2027-ipps-fr-tables-6a-6k.zipSHA-256 ca0af87b0869a405…
• ICD-10-CM FY2027 POA-exempt codes (full list, additions, deletions and revisions)
  Version FY2027 · effective 2026-10-01 · file 2027-poa-exempt-codes.zipSHA-256 03f55091045024d0…
• ICD-10-CM to CMS-HCC V28 mappings, payment year 2027 initial
  Version PY2027 initial ICD-10-CM mappings (dates of service 2026) · effective 2027-01-01 · file 2027 Initial ICD-10-CM Mappings.csvSHA-256 9c260b06d0dd2806…
• Medicare Coverage Database, current Billing and Coding Articles export
  Version MCD release 2026-10-08 · effective 2026-10-04 · file article.csvSHA-256 5e95c4a8ac3664be…