ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.2 > M67.27 M67.27 Synovial hypertrophy, not elsewhere classified, ankle and foot Non-Billable/Non-Specific Codes M67.271Synovial hypertrophy, not elsewhere classified, right ankle and footM67.272Synovial hypertrophy, not elsewhere classified, left ankle and footM67.279Synovial hypertrophy, not elsewhere classified, unspecified ankle and foot