ICD-10-CM > M00-M99 > M60-M63 > M62 > M62.5 > M62.52 M62.52 Muscle wasting and atrophy, not elsewhere classified, upper arm Non-Billable/Non-Specific Codes M62.521Muscle wasting and atrophy, not elsewhere classified, right upper armM62.522Muscle wasting and atrophy, not elsewhere classified, left upper armM62.529Muscle wasting and atrophy, not elsewhere classified, unspecified upper arm