A55 vs A74
A55 (Chlamydial lymphogranuloma (venereum)) compared with A74 (Other diseases caused by chlamydiae), 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. A74 carries an Excludes1 note covering A55: “sexually transmitted chlamydial diseases (A55-A56)”
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
| A55Chlamydial lymphogranuloma (venereum) | A74Other diseases caused by chlamydiae | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Chlamydial lymphogranuloma (venereum) is a billable ICD-10-CM diagnosis code (A55). | Other diseases caused by chlamydiae is a non-billable ICD-10-CM category code (A74). |
| Includes | Climatic or tropical bubo Durand-Nicolas-Favre disease Esthiomene Lymphogranuloma inguinale | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources