M66.1 vs M71.3
M66.1 (Rupture of synovium) compared with M71.3 (Other bursal cyst), 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. M71.3 carries an Excludes1 note covering M66.1: “synovial cyst with rupture (M66.1-)”
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
| M66.1Rupture of synovium | M71.3Other bursal cyst | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| 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 | Rupture of synovium is a non-billable ICD-10-CM category code (M66.1). | Other bursal cyst is a non-billable ICD-10-CM category code (M71.3). |
| Includes | rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength Rupture of synovial cyst | Synovial cyst NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources