ICD-10 Code for Myositis

The default ICD-10-CM 2027 code for myositis is M60.9 – Myositis, unspecified. More specific codes depend on the details documented, as listed in the official index (93 codes, 41 billable).

Main code: M60.9 – Myositis, unspecified
Billable: Yes

Index entries for Myositis

clostridial – A48.0
due to posture – see Myositis, specified type NEC
epidemic – B33.0
fibrosa or fibrous (chronic) – T79.6 (header)
foreign body granuloma – see Granuloma, foreign body
in (due to)
- bilharziasis – B65.9 – M63.8- (header) [manifestation]
- cysticercosis – B69.81
- leprosy – A30.9 – M63.8- (header) [manifestation]
- mycosis – B49 – M63.8- (header) [manifestation]
- sarcoidosis – D86.87
- schistosomiasis – B65.9 – M63.8- (header) [manifestation]
- syphilis
  - late – A52.78
  - secondary – A51.49
- toxoplasmosis (acquired) – B58.82
- trichinellosis – B75 – M63.8- (header) [manifestation]
- tuberculosis – A18.09
inclusion body [IBM] – G72.41
infective – M60.009
- arm – M60.002
  - left – M60.001
  - right – M60.000
- leg – M60.005
  - left – M60.004
  - right – M60.003
- lower limb – M60.005
  - ankle – M60.07- (header)
  - foot – M60.07- (header)
  - lower leg – M60.06- (header)
  - thigh – M60.05- (header)
  - toe – M60.07- (header)
- multiple sites – M60.09
- specified site NEC – M60.08
- upper limb – M60.002
  - finger – M60.04- (header)
  - forearm – M60.03- (header)
  - hand – M60.04- (header)
  - shoulder region – M60.01- (header)
  - upper arm – M60.02- (header)
interstitial – M60.10
- ankle – M60.17- (header)
- foot – M60.17- (header)
- forearm – M60.13- (header)
- hand – M60.14- (header)
- lower leg – M60.16- (header)
- multiple sites – M60.19
- shoulder region – M60.11- (header)
- specified site NEC – M60.18
- thigh – M60.15- (header)
- upper arm – M60.12- (header)
mycotic – B49 – M63.8- (header) [manifestation]
orbital, chronic – H05.12- (header)
ossificans or ossifying (circumscripta) – see also Ossification, muscle, specified NEC
- in (due to)
  - burns – M61.30
    - ankle – M61.37- (header)
    - foot – M61.37- (header)
    - forearm – M61.33- (header)
    - hand – M61.34- (header)
    - lower leg – M61.36- (header)
    - multiple sites – M61.39
    - pelvic region – M61.35- (header)
    - shoulder region – M61.31- (header)
    - specified site NEC – M61.38
    - thigh – M61.35- (header)
    - upper arm – M61.32- (header)
  - quadriplegia or paraplegia – M61.20
    - ankle – M61.27- (header)
    - foot – M61.27- (header)
    - forearm – M61.23- (header)
    - hand – M61.24- (header)
    - lower leg – M61.26- (header)
    - multiple sites – M61.29
    - pelvic region – M61.25- (header)
    - shoulder region – M61.21- (header)
    - specified site NEC – M61.28
    - thigh – M61.25- (header)
    - upper arm – M61.22- (header)
- progressiva – M61.10
  - ankle – M61.17- (header)
  - finger – M61.14- (header)
  - foot – M61.17- (header)
  - forearm – M61.13- (header)
  - hand – M61.14- (header)
  - lower leg – M61.16- (header)
  - multiple sites – M61.19
  - pelvic region – M61.15- (header)
  - shoulder region – M61.11- (header)
  - specified site NEC – M61.18
  - thigh – M61.15- (header)
  - toe – M61.17- (header)
  - upper arm – M61.12- (header)
- traumatica – M61.00
  - ankle – M61.07- (header)
  - foot – M61.07- (header)
  - forearm – M61.03- (header)
  - hand – M61.04- (header)
  - lower leg – M61.06- (header)
  - multiple sites – M61.09
  - pelvic region – M61.05- (header)
  - shoulder region – M61.01- (header)
  - specified site NEC – M61.08
  - thigh – M61.05- (header)
  - upper arm – M61.02- (header)
purulent – see Myositis, infective
specified type NEC – M60.80
- ankle – M60.87- (header)
- foot – M60.87- (header)
- forearm – M60.83- (header)
- hand – M60.84- (header)
- lower leg – M60.86- (header)
- multiple sites – M60.89
- pelvic region – M60.85- (header)
- shoulder region – M60.81- (header)
- specified site NEC – M60.88
- thigh – M60.85- (header)
- upper arm – M60.82- (header)
suppurative – see Myositis, infective
traumatic (old) – see Myositis, specified type NEC

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.