A56.01 vs N37
A56.01 (Chlamydial cystitis and urethritis) compared with N37 (Urethral disorders in diseases classified elsewhere), 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. N37 carries an Excludes1 note covering A56.01: “chlamydial (A56.01)”
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
| A56.01Chlamydial cystitis and urethritis | N37Urethral disorders in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Chlamydial cystitis and urethritis is a billable ICD-10-CM diagnosis code (A56.01). | Urethral disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (N37). |
| Includes | sexually transmitted diseases due to Chlamydia trachomatis | — |
| Code first | — | underlying disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources