ICD-10-CM > M00-M99 > M60-M63 > M62 > M62.4 > M62.43 M62.43 Contracture of muscle, forearm Non-Billable/Non-Specific Codes M62.431Contracture of muscle, right forearmM62.432Contracture of muscle, left forearmM62.439Contracture of muscle, unspecified forearm