ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.2 > M67.22 M67.22 Synovial hypertrophy, not elsewhere classified, upper arm Non-Billable/Non-Specific Codes M67.221Synovial hypertrophy, not elsewhere classified, right upper armM67.222Synovial hypertrophy, not elsewhere classified, left upper armM67.229Synovial hypertrophy, not elsewhere classified, unspecified upper arm