ICD-10-CM > M00-M99 > M60-M63 > M63 > M63.8 > M63.81 M63.81 Disorders of muscle in diseases classified elsewhere, shoulder Non-Billable/Non-Specific Codes M63.811Disorders of muscle in diseases classified elsewhere, right shoulderM63.812Disorders of muscle in diseases classified elsewhere, left shoulderM63.819Disorders of muscle in diseases classified elsewhere, unspecified shoulder