ICD-10-CM > M00-M99 > M60-M63 > M63 > M63.8 > M63.82 M63.82 Disorders of muscle in diseases classified elsewhere, upper arm Non-Billable/Non-Specific Codes M63.821Disorders of muscle in diseases classified elsewhere, right upper armM63.822Disorders of muscle in diseases classified elsewhere, left upper armM63.829Disorders of muscle in diseases classified elsewhere, unspecified upper arm