ICD-10-CM 2027
ICD-10 code for mastication muscle myalgia
From the official ICD-10-CM alphabetic index entry “Myalgia › mastication muscle”. Page updated September 29, 2026.
About coding mastication muscle myalgia
The ICD-10-CM code for mastication muscle myalgia is M79.11 (Myalgia of mastication muscle).
Within M79.1 (myalgia), M79.11 is specifically for myalgia of mastication muscle. Related codes cover unspecified site (M79.10), 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.
Common questions about mastication muscle myalgia ICD-10 codes
What is the ICD-10 code for mastication muscle myalgia?
- M79.11 — Myalgia of mastication muscle.
Is M79.11 billable?
- Yes. M79.11 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M79.11 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M79.11 as a principal diagnosis.
Is M79.11 a CC or MCC?
- No. M79.11 is neither a CC nor an MCC under MS-DRG v44.0.