ICD-10-CM 2027
ICD-10 code for myalgia
From the official ICD-10-CM alphabetic index entry “Myalgia”. Page updated September 29, 2026.
About coding myalgia
The ICD-10-CM code for myalgia is M79.10 (Myalgia, unspecified site). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M79.10.
Within M79.1, choose M79.10 (unspecified site) only when documentation doesn't support a more specific option: of mastication muscle (M79.11), of auxiliary muscles, head and neck (M79.12) and other site (M79.18).
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 myalgia codes (official index)
Common questions about myalgia ICD-10 codes
What is the ICD-10 code for myalgia?
- M79.10 — Myalgia, unspecified site. More specific codes apply when the documentation supports them: M79.12, B33.0, M79.11, M79.18 and others below.
What is the ICD-10 code for epidemic myalgia?
- B33.0 — Epidemic myalgia.
What is the ICD-10 code for mastication muscle myalgia?
- M79.11 — Myalgia of mastication muscle.
What is the ICD-10 code for site specified nec myalgia?
- M79.18 — Myalgia, other site.
What is the ICD-10 code for traumatic nec myalgia?
- T14.8 — Other injury of unspecified body region (header code; choose a more specific subcode).
Is M79.10 billable?
- Yes. M79.10 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M79.10 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M79.10 as a principal diagnosis.
Is M79.10 a CC or MCC?
- No. M79.10 is neither a CC nor an MCC under MS-DRG v44.0.