A59.03 vs N33
A59.03 (Trichomonal cystitis and urethritis) compared with N33 (Bladder 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. N33 carries an Excludes1 note covering A59.03: “trichomonal cystitis (A59.03)”
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
| A59.03Trichomonal cystitis and urethritis | N33Bladder 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 | Trichomonal cystitis and urethritis is a billable ICD-10-CM diagnosis code (A59.03). | Bladder disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (N33). |
| Code first | — | underlying disease, such as: schistosomiasis (B65.0-B65.9) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources