ICD-10-CM 2027
ICD-10 code for chlamydial pneumonia
From the official ICD-10-CM alphabetic index entry “Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › chlamydial”. Page updated September 29, 2026.
About coding chlamydial pneumonia
The ICD-10-CM code for chlamydial pneumonia is J16.0 (Chlamydial pneumonia). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on J16.0.
Within J16 (pneumonia due to other infectious organisms, not elsewhere classified), J16.0 is specifically for chlamydial pneumonia. Related codes cover pneumonia due to other specified infectious organisms (J16.8).
Code first: , if applicable, associated influenza (J09.X1, J10.0-, J11.0-).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific chlamydial pneumonia codes (official index)
- congenital P23.1 — Congenital pneumonia due to Chlamydia
Common questions about chlamydial pneumonia ICD-10 codes
What is the ICD-10 code for chlamydial pneumonia?
- J16.0 — Chlamydial pneumonia. More specific codes apply when the documentation supports them: P23.1.
What is the ICD-10 code for congenital chlamydial pneumonia?
- P23.1 — Congenital pneumonia due to Chlamydia.
Is J16.0 billable?
- Yes. J16.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J16.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J16.0 as a principal diagnosis.
Is J16.0 a CC or MCC?
- J16.0 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.