ICD-10-CM > M00-M99 > M60-M63 > M61 > M61.5 > M61.55 M61.55 Other ossification of muscle, thigh Non-Billable/Non-Specific Codes M61.551Other ossification of muscle, right thighM61.552Other ossification of muscle, left thighM61.559Other ossification of muscle, unspecified thigh