ICD-10-CM > M00-M99 > M65-M67 > M65 > M65.0 > M65.02 M65.02 Abscess of tendon sheath, upper arm Non-Billable/Non-Specific Codes M65.021Abscess of tendon sheath, right upper armM65.022Abscess of tendon sheath, left upper armM65.029Abscess of tendon sheath, unspecified upper arm