A43.0 — Pulmonary nocardiosis
A43.0 is a billable, specific ICD-10-CM code for pulmonary nocardiosis. It is valid for submission on a claim.
Other codes that can never be billed with A43.0
These codes carry an Excludes1 note pointing at A43.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A43.0 alone.
- J17Pneumonia in diseases classified elsewhere
Risk adjustment
A43.0 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
A43.0 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
- A56717Billing and Coding: Respiratory Therapy (Respiratory Care)
- A57205Billing and Coding: Oximetry Services
- A57224Billing and Coding: Respiratory Care
How A43.0 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 A43.0.
- Nocardiosis, nocardiasis›lung
- Nocardiosis, nocardiasis›pneumonia
- Nocardiosis, nocardiasis›pulmonary
- Pneumonia›in›nocardiosis, nocardiasis
Related codes at this level
Codes that share A43. If A43.0 is not quite right, the correct code is usually one of these.
Questions about A43.0
- Is A43.0 a billable ICD-10-CM code?
- Yes. A43.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does A43.0 sit in the tabular list?
- Certain infectious and parasitic diseases (A00-B99), in the block Other bacterial diseases (A30-A49).