ICD-10-CM › M00-M99 › M65-M67 › M65.9 Synovitis and tenosynovitis, unspecified › M65.99
M65.99
Unspecified synovitis and tenosynovitis, multiple sites
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2025 to now.
- FY2025 Added to the code set Unspecified synovitis and tenosynovitis, multiple sites
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M65 Synovitis and tenosynovitis
Excludes1 - never coded here
- chronic crepitant synovitis of hand and wrist (M70.0-)
- current injury - see injury of ligament or tendon by body region
- soft tissue disorders related to use, overuse and pressure (M70.-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Synovitis
- Tenonitis
- Tenosynovitis
- Tenovaginitis
- Tendosynovitis
- Tenontothecitis
- Tenontosynovitis
- Sloughing > tendon
- Slipped, slipping > tendon
- Disease, diseased > synovium
- Disorder > tendon > synovitis
- Disorder > synovium > synovitis
- Disorder > tendon > tenosynovitis
- Disease, diseased > tendon, tendinous
- Inflammation, inflamed, inflammatory > synovial
- Inflammation, inflamed, inflammatory > tendon NEC
- Synovitis > multiple sites, unspecified type
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M65.90 | Unspecified synovitis and tenosynovitis, unspecified site | Valid |
| M65.91 | Unspecified synovitis and tenosynovitis, shoulder | Not billable |
| M65.92 | Unspecified synovitis and tenosynovitis, upper arm | Not billable |
| M65.93 | Unspecified synovitis and tenosynovitis, forearm | Not billable |
| M65.94 | Unspecified synovitis and tenosynovitis, hand | Not billable |
| M65.95 | Unspecified synovitis and tenosynovitis, thigh | Not billable |
| M65.96 | Unspecified synovitis and tenosynovitis, lower leg | Not billable |
| M65.97 | Unspecified synovitis and tenosynovitis, ankle and foot | Not billable |
| M65.98 | Unspecified synovitis and tenosynovitis, other site | Valid |