Disorders of synovium and tendon (M65-M67) ICD-10-CM
The M65–M67 section covers disorders of synovium and tendon with 502 ICD-10-CM diagnosis codes, of which 379 are billable in fiscal year 2027. The section is organized into the 3 code ranges listed below.
Code Ranges in This Section 3 ranges · 502 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M65 | Synovitis and tenosynovitis (M65) | 179 | 133 |
| M66 | Spontaneous rupture of synovium and tendon (M66) | 135 | 103 |
| M67 | Other disorders of synovium and tendon (M67) | 188 | 143 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M65–M67 Code Range
Problems of the synovium and tendons include tendon-sheath abscesses, trigger finger, spontaneous ruptures, and plantar fasciitis.
M65 separates named conditions such as infectious synovitis, calcific tendinitis, trigger finger, and radial styloid tenosynovitis. M66 separates spontaneous ruptures by what ruptures: a popliteal cyst, synovium, or an extensor, flexor, or other tendon. M67 groups other named conditions, including acquired short Achilles tendon, ganglion, plica syndrome, and plantar fasciitis.
FY 2027 changes: The FY 2027 ICD-10-CM update, effective October 1, 2026, added M67.A01, M67.A02 and M67.A09.
Questions About This Page
How many codes are in the M65-M67 range?
The M65-M67 range contains 502 ICD-10-CM diagnosis codes in FY 2027. 379 of them are billable, and the rest are category headers that organize the section.
What conditions does M65-M67 cover?
The range covers disorders of synovium and tendon. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
