J16.0 vs J17
J16.0 (Chlamydial pneumonia) compared with J17 (Pneumonia in diseases classified elsewhere), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. J17 carries an Excludes1 note covering J16.0: “chlamydial pneumonia (J16.0)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| J16.0Chlamydial pneumonia | J17Pneumonia in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | J00-J99 — Diseases of the Respiratory System (J00-J99) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Chlamydial pneumonia is a billable ICD-10-CM diagnosis code (J16.0). | Pneumonia in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (J17). |
| Use additional code | code, if applicable, to identify resistance to antimicrobial drugs (Z16.-) | code, if applicable, to identify resistance to antimicrobial drugs (Z16.-) |
| Code first | , if applicable, associated influenza (J09.X1, J10.0-, J11.0-) | underlying disease, such as: Q fever (A78) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources