ICD-10-CM 2027
ICD-10 code for myositis
From the official ICD-10-CM alphabetic index entry “Myositis”. Page updated September 29, 2026.
About coding myositis
The ICD-10-CM code for myositis is M60.9 (Myositis, unspecified). The official index lists 111 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M60.9.
Within M60, choose M60.9 (unspecified) only when documentation doesn't support a more specific option: infective myositis (M60.0), interstitial myositis (M60.1), foreign body granuloma of soft tissue, not elsewhere classified (M60.2) and other myositis (M60.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 555 (Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC, relative weight 1.2913) and DRG 556 (Signs and Symptoms of Musculoskeletal System and Connective Tissue without MCC, relative weight 0.8211), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific myositis codes (official index)
- clostridial A48.0 — Gas gangrene
- due to posture
- epidemic B33.0 — Epidemic myalgia
- fibrosa or fibrous (chronic), Volkmann's T79.6 — Traumatic ischemia of muscle
- foreign body granuloma
- in (due to)
- bilharziasis B65.9 — Schistosomiasis, unspecified
- cysticercosis B69.81 — Myositis in cysticercosis
- leprosy A30.9 — Leprosy, unspecified
- mycosis B49 — Unspecified mycosis
- sarcoidosis D86.87 — Sarcoid myositis
- schistosomiasis B65.9 — Schistosomiasis, unspecified
- syphilis
- late A52.78 — Syphilis of other musculoskeletal tissue
- secondary A51.49 — Other secondary syphilitic conditions
- toxoplasmosis (acquired) B58.82 — Toxoplasma myositis
- trichinellosis B75 — Trichinellosis
- tuberculosis A18.09 — Other musculoskeletal tuberculosis
- inclusion body [IBM] G72.41 — Inclusion body myositis [IBM]
- infective M60.009 — Infective myositis, unspecified site
- arm M60.002 — Infective myositis, unspecified arm
- left M60.001 — Infective myositis, unspecified left arm
- right M60.000 — Infective myositis, unspecified right arm
- leg M60.005 — Infective myositis, unspecified leg
- left M60.004 — Infective myositis, unspecified left leg
- right M60.003 — Infective myositis, unspecified right leg
- lower limb M60.005 — Infective myositis, unspecified leg
- ankle M60.07 — Infective myositis, ankle, foot and toes
- foot M60.07 — Infective myositis, ankle, foot and toes
- lower leg M60.06 — Infective myositis, lower leg
- thigh M60.05 — Infective myositis, thigh
- toe M60.07 — Infective myositis, ankle, foot and toes
- multiple sites M60.09 — Infective myositis, multiple sites
- specified site NEC M60.08 — Infective myositis, other site
- upper limb M60.002 — Infective myositis, unspecified arm
- finger M60.04 — Infective myositis, hand and fingers
- forearm M60.03 — Infective myositis, forearm
- hand M60.04 — Infective myositis, hand and fingers
- shoulder region M60.01 — Infective myositis, shoulder
- upper arm M60.02 — Infective myositis, upper arm
- interstitial M60.10 — Interstitial myositis of unspecified site
- ankle M60.17 — Interstitial myositis, ankle and foot
- foot M60.17 — Interstitial myositis, ankle and foot
- forearm M60.13 — Interstitial myositis, forearm
- hand M60.14 — Interstitial myositis, hand
- lower leg M60.16 — Interstitial myositis, lower leg
- multiple sites M60.19 — Interstitial myositis, multiple sites
- shoulder region M60.11 — Interstitial myositis, shoulder
- specified site NEC M60.18 — Interstitial myositis, other site
- thigh M60.15 — Interstitial myositis, thigh
- upper arm M60.12 — Interstitial myositis, upper arm
- mycotic B49 — Unspecified mycosis
- orbital, chronic H05.12 — Orbital myositis
- ossificans or ossifying (circumscripta)
- in (due to)
- burns M61.30 — Calcification and ossification of muscles associated with burns, unspecified site
- ankle M61.37 — Calcification and ossification of muscles associated with burns, ankle and foot
- foot M61.37 — Calcification and ossification of muscles associated with burns, ankle and foot
- forearm M61.33 — Calcification and ossification of muscles associated with burns, forearm
- hand M61.34 — Calcification and ossification of muscles associated with burns, hand
- lower leg M61.36 — Calcification and ossification of muscles associated with burns, lower leg
- multiple sites M61.39 — Calcification and ossification of muscles associated with burns, multiple sites
- pelvic region M61.35 — Calcification and ossification of muscles associated with burns, thigh
- shoulder region M61.31 — Calcification and ossification of muscles associated with burns, shoulder
- specified site NEC M61.38 — Calcification and ossification of muscles associated with burns, other site
- thigh M61.35 — Calcification and ossification of muscles associated with burns, thigh
- upper arm M61.32 — Calcification and ossification of muscles associated with burns, upper arm
- quadriplegia or paraplegia M61.20 — Paralytic calcification and ossification of muscle, unspecified site
- ankle M61.27 — Paralytic calcification and ossification of muscle, ankle and foot
- foot M61.27 — Paralytic calcification and ossification of muscle, ankle and foot
- forearm M61.23 — Paralytic calcification and ossification of muscle, forearm
- hand M61.24 — Paralytic calcification and ossification of muscle, hand
- lower leg M61.26 — Paralytic calcification and ossification of muscle, lower leg
- multiple sites M61.29 — Paralytic calcification and ossification of muscle, multiple sites
- pelvic region M61.25 — Paralytic calcification and ossification of muscle, thigh
- shoulder region M61.21 — Paralytic calcification and ossification of muscle, shoulder
- specified site NEC M61.28 — Paralytic calcification and ossification of muscle, other site
- thigh M61.25 — Paralytic calcification and ossification of muscle, thigh
- upper arm M61.22 — Paralytic calcification and ossification of muscle, upper arm
- progressiva M61.10 — Myositis ossificans progressiva, unspecified site
- ankle M61.17 — Myositis ossificans progressiva, ankle, foot and toe(s)
- finger M61.14 — Myositis ossificans progressiva, hand and finger(s)
- foot M61.17 — Myositis ossificans progressiva, ankle, foot and toe(s)
- forearm M61.13 — Myositis ossificans progressiva, forearm
- hand M61.14 — Myositis ossificans progressiva, hand and finger(s)
- lower leg M61.16 — Myositis ossificans progressiva, lower leg
- multiple sites M61.19 — Myositis ossificans progressiva, multiple sites
- pelvic region M61.15 — Myositis ossificans progressiva, thigh
- shoulder region M61.11 — Myositis ossificans progressiva, shoulder
- specified site NEC M61.18 — Myositis ossificans progressiva, other site
- thigh M61.15 — Myositis ossificans progressiva, thigh
- toe M61.17 — Myositis ossificans progressiva, ankle, foot and toe(s)
- upper arm M61.12 — Myositis ossificans progressiva, upper arm
- traumatica M61.00 — Myositis ossificans traumatica, unspecified site
- ankle M61.07 — Myositis ossificans traumatica, ankle and foot
- foot M61.07 — Myositis ossificans traumatica, ankle and foot
- forearm M61.03 — Myositis ossificans traumatica, forearm
- hand M61.04 — Myositis ossificans traumatica, hand
- lower leg M61.06 — Myositis ossificans traumatica, lower leg
- multiple sites M61.09 — Myositis ossificans traumatica, multiple sites
- pelvic region M61.05 — Myositis ossificans traumatica, thigh
- shoulder region M61.01 — Myositis ossificans traumatica, shoulder
- specified site NEC M61.08 — Myositis ossificans traumatica, other site
- thigh M61.05 — Myositis ossificans traumatica, thigh
- upper arm M61.02 — Myositis ossificans traumatica, upper arm
- purulent
- specified type NEC M60.80 — Other myositis, unspecified site
- ankle M60.87 — Other myositis, ankle and foot
- foot M60.87 — Other myositis, ankle and foot
- forearm M60.83 — Other myositis, forearm
- hand M60.84 — Other myositis, hand
- lower leg M60.86 — Other myositis, lower leg
- multiple sites M60.89 — Other myositis, multiple sites
- pelvic region M60.85 — Other myositis, thigh
- shoulder region M60.81 — Other myositis shoulder
- specified site NEC M60.88 — Other myositis, other site
- thigh M60.85 — Other myositis, thigh
- upper arm M60.82 — Other myositis, upper arm
- suppurative
- traumatic (old)
Common questions about myositis ICD-10 codes
What is the ICD-10 code for myositis?
- M60.9 — Myositis, unspecified. More specific codes apply when the documentation supports them: A48.0, B33.0, T79.6, B65.9 and others below.
What is the ICD-10 code for clostridial myositis?
- A48.0 — Gas gangrene.
What is the ICD-10 code for epidemic myositis?
- B33.0 — Epidemic myalgia.
What is the ICD-10 code for inclusion body [ibm] myositis?
- G72.41 — Inclusion body myositis [IBM].
What is the ICD-10 code for infective myositis?
- M60.009 — Infective myositis, unspecified site.
What is the ICD-10 code for interstitial myositis?
- M60.10 — Interstitial myositis of unspecified site.
What is the ICD-10 code for mycotic myositis?
- B49 — Unspecified mycosis.
Is M60.9 billable?
- Yes. M60.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M60.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M60.9 as a principal diagnosis.
Is M60.9 a CC or MCC?
- No. M60.9 is neither a CC nor an MCC under MS-DRG v44.0.