A56 vs M02.3
A56 (Other sexually transmitted chlamydial diseases) compared with M02.3 (Reiter's disease), 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. A56 carries an Excludes1 note covering M02.3: “Reiter's disease (M02.3-)”
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
| A56Other sexually transmitted chlamydial diseases | M02.3Reiter's disease | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Other sexually transmitted chlamydial diseases is a non-billable ICD-10-CM category code (A56). | Reiter's disease is a non-billable ICD-10-CM category code (M02.3). |
| Includes | sexually transmitted diseases due to Chlamydia trachomatis | Reactive arthritis |
| Code first | — | underlying disease, such as: congenital syphilis [Clutton's joints] (A50.5) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources