ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.0 > M65.03 M65.03 Abscess of tendon sheath, forearm Non-Billable/Non-Specific Codes M65.031Abscess of tendon sheath, right forearmM65.032Abscess of tendon sheath, left forearmM65.039Abscess of tendon sheath, unspecified forearm