ICD-10-CM > M00-M99 > M60-M63 > M61 > M61.5 > M61.53 M61.53 Other ossification of muscle, forearm Non-Billable/Non-Specific Codes M61.531Other ossification of muscle, right forearmM61.532Other ossification of muscle, left forearmM61.539Other ossification of muscle, unspecified forearm