A55 vs B20
A55 (Chlamydial lymphogranuloma (venereum)) compared with B20 (Human immunodeficiency virus [HIV] disease), 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. A55 carries an Excludes2 note covering B20: “human immunodeficiency virus [HIV] disease (B20)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| A55Chlamydial lymphogranuloma (venereum) | B20Human immunodeficiency virus [HIV] disease | |
|---|---|---|
| Billing status | Billable | Billable |
| 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). | Human immunodeficiency virus [HIV] disease is a billable ICD-10-CM diagnosis code (B20). |
| Includes | Climatic or tropical bubo Durand-Nicolas-Favre disease Esthiomene Lymphogranuloma inguinale | acquired immune deficiency syndrome [AIDS] AIDS-related complex [ARC] HIV infection, symptomatic |
| Use additional code | — | code(s) to identify all manifestations of HIV infection |
| Code first | — | Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources