M02.3 (Reiter's disease) compared with M45.A0 (Non-radiographic axial spondyloarthritis of unspecified sites in spine), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Not coded here — these two are mutually exclusive.
“arthropathy in Reiter's disease (M02.3-)”
An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.
Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a
No — do not report together. M45.A0 carries an Excludes1 note covering M02.3: “arthropathy in 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).
| M02.3Reiter's disease | M45.A0Non-radiographic axial spondyloarthritis of unspecified sites in spine | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Reiter's disease is a non-billable ICD-10-CM category code (M02.3). | Non-radiographic axial spondyloarthritis of unspecified sites in spine is a billable ICD-10-CM diagnosis code (M45.A0). |
| Includes | 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