ICD-10-CM > M00-M99 > M60-M63 > M63 > M63.8 > M63.85 M63.85 Disorders of muscle in diseases classified elsewhere, thigh Non-Billable/Non-Specific Codes M63.851Disorders of muscle in diseases classified elsewhere, right thighM63.852Disorders of muscle in diseases classified elsewhere, left thighM63.859Disorders of muscle in diseases classified elsewhere, unspecified thigh