A42: Actinomycosis
Codes under A42 (Actinomycosis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| A42.0 | Pulmonary actinomycosis | ✓ |
| A42.0 | Pulmonary actinomycosis | ✓ |
| A42.1 | Abdominal actinomycosis | ✓ |
| A42.1 | Abdominal actinomycosis | ✓ |
| A42.2 | Cervicofacial actinomycosis | ✓ |
| A42.2 | Cervicofacial actinomycosis | ✓ |
| A42.7 | Actinomycotic sepsis | ✓ |
| A42.7 | Actinomycotic sepsis | ✓ |
| A42.8 | Other forms of actinomycosis | — |
| A42.8 | Other forms of actinomycosis | — |
| A42.9 | Actinomycosis, unspecified | ✓ |
| A42.9 | Actinomycosis, unspecified | ✓ |
| A42.81 | Actinomycotic meningitis | ✓ |
| A42.81 | Actinomycotic meningitis | ✓ |
| A42.82 | Actinomycotic encephalitis | ✓ |
| A42.82 | Actinomycotic encephalitis | ✓ |
| A42.89 | Other forms of actinomycosis | ✓ |
| A42.89 | Other forms of actinomycosis | ✓ |
Frequently asked questions
What is ICD-10-CM code A42?
A42 is an ICD-10-CM category covering Actinomycosis. It contains 18 more specific diagnosis codes, 16 of which are billable.
Is A42 a billable code?
No — A42 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example A42.0 — Pulmonary actinomycosis). 16 of the 18 codes under A42 are billable.
What codes fall under A42?
A42 includes A42.0, A42.0, A42.1, A42.1, A42.2, plus 13 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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