A49 vs A74.9
A49 (Bacterial infection of unspecified site) compared with A74.9 (Chlamydial infection, unspecified), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. A49 carries an Excludes2 note covering A74.9: “chlamydial infection NOS (A74.9)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| A49Bacterial infection of unspecified site | A74.9Chlamydial infection, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Bacterial infection of unspecified site is a non-billable ICD-10-CM category code (A49). | Chlamydial infection, unspecified is a billable ICD-10-CM diagnosis code (A74.9). |
| Includes | — | Chlamydiosis NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources