Abscess of tendon sheath, unspecified hand

This code represents an infection with pus formation within the synovial sheath surrounding a tendon in the hand, where the specific digit or side is not documented. It indicates an inflammatory process affecting the tendon's protective covering, leading to localized collection of purulent material.

Use this code when documentation clearly states an abscess of a tendon sheath in the hand, but the laterality (left/right) or specific digit (e.g., thumb, index finger) is not specified. This code is appropriate for initial encounters or when detailed anatomical information is unavailable at the time of coding.

• Avoid using this code if the specific hand (left or right) or digit is documented; instead, use a more specific M65.04- subcategory.
• Ensure documentation supports an abscess of the tendon sheath, not just tenosynovitis without pus formation.
• Consider sequencing this code after a code for the underlying cause of the infection, if known (e.g., open wound, puncture).