ICD-10 Code for Tenosynovitis

The default ICD-10-CM 2027 code for tenosynovitis is M65.90 – Unspecified synovitis and tenosynovitis, unspecified site. More specific codes depend on the details documented, as listed in the official index (24 codes, 8 billable).

Main code: M65.90 – Unspecified synovitis and tenosynovitis, unspecified site
Billable: Yes
See also: Synovitis

Index entries for Tenosynovitis

adhesive – see Tenosynovitis, specified type NEC
- shoulder – see Capsulitis, adhesive
bicipital (calcifying) – see Tendinitis, bicipital
gonococcal – A54.49
in (due to)
- crystals – M65.8- (header)
- gonorrhea – A54.49
- syphilis (late) – A52.78
- use, overuse, pressure – see also Disorder, soft tissue, due to use
  - specified NEC – see Disorder, soft tissue, due to use, specified NEC
infective NEC – M65.1- (header)
- ankle – M65.17- (header)
- foot – M65.17- (header)
- forearm – M65.13- (header)
- hand – M65.14- (header)
- lower leg – M65.16- (header)
- multiple sites – M65.19
- pelvic region – M65.15- (header)
- shoulder region – M65.11- (header)
- specified site NEC – M65.18
- thigh – M65.15- (header)
- upper arm – M65.12- (header)
radial styloid – M65.4
shoulder region – M65.81- (header)
- adhesive – see Capsulitis, adhesive
specified type NEC – M65.88
- ankle – M65.87- (header)
- foot – M65.87- (header)
- forearm – M65.83- (header)
- hand – M65.84- (header)
- lower leg – M65.86- (header)
- multiple sites – M65.89
- pelvic region – M65.85- (header)
- shoulder region – M65.81- (header)
- specified site NEC – M65.88
- thigh – M65.85- (header)
- upper arm – M65.82- (header)
tuberculous – see Tuberculosis, tenosynovitis

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.