J16.0 — Chlamydial pneumonia
J16.0 is a billable, specific ICD-10-CM code for chlamydial pneumonia. It is valid for submission on a claim.
Excludes1 inherited from the categories above J16.0
These are not written on J16.0, but they bind it: a note on a category applies to every code beneath it. Billing J16.0 with anything listed here is a denial.
Other codes that can never be billed with J16.0
These codes carry an Excludes1 note pointing at J16.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading J16.0 alone.
Risk adjustment
J16.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
J16.0 is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52466Nebulizers - Policy Article
- A52466Nebulizers - Policy Article
- A52466Nebulizers - Policy Article
- A52466Nebulizers - Policy Article
How J16.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to J16.0.
- Pneumonia›chlamydial
- Pneumonia›in›Chlamydia
Code history
J16.0 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share J16. If J16.0 is not quite right, the correct code is usually one of these.
Questions about J16.0
- Is J16.0 a billable ICD-10-CM code?
- Yes. J16.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does J16.0 sit in the tabular list?
- Diseases of the respiratory system (J00-J99), in the block Influenza and pneumonia (J09-J18).
- What cannot be coded together with J16.0?
- J16.0 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above J16.0 (J16) and apply to it just the same.