M65.80
Other synovitis and tenosynovitis, unspecified site
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 9 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 13 never code together
M65code
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 1
M00-M99chapter
Notes
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Index entries leading here 2
Alongside this code 9 same parent — M65.8
M65.81 Other synovitis and tenosynovitis, shoulder category M65.82 Other synovitis and tenosynovitis, upper arm category M65.83 Other synovitis and tenosynovitis, forearm category M65.84 Other synovitis and tenosynovitis, hand category M65.85 Other synovitis and tenosynovitis, thigh category M65.86 Other synovitis and tenosynovitis, lower leg category M65.87 Other synovitis and tenosynovitis, ankle and foot category M65.88 Other synovitis and tenosynovitis, other site M65.89 Other synovitis and tenosynovitis, multiple sites
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.