Abscess of tendon sheath, unspecified forearm

This diagnosis code signifies an infection within the synovial sheath surrounding a tendon in the forearm, characterized by the formation of pus. It indicates an inflammatory process affecting the tendon's protective covering, leading to localized pain, swelling, and potential functional impairment. The "unspecified" nature means the laterality (left or right) of the forearm is not documented.

Apply this code when documentation clearly states an abscess of a tendon sheath in the forearm, but does not specify whether it's the left or right forearm. This code is appropriate for acute infections requiring incision and drainage or antibiotic therapy. Supporting documentation includes physician notes detailing the presence of pus, inflammation, and location within the forearm tendon sheath.

• Ensure the documentation explicitly states "abscess" and "tendon sheath" in the forearm.
• If laterality (left or right) is specified, use the more specific codes M65.031 (right) or M65.032 (left).
• Do not confuse with cellulitis or other soft tissue infections that do not specifically involve the tendon sheath.