Abscess of tendon sheath, left ankle and foot

This code signifies an infection with pus formation within the synovial sheath surrounding a tendon in the left ankle or foot. This condition, also known as tenosynovial abscess, can lead to pain, swelling, and restricted movement of the affected tendon. It typically results from bacterial invasion following trauma, puncture wounds, or spread from adjacent infections.

Apply this code when documentation clearly indicates an abscess involving a tendon sheath specifically in the left ankle or foot. This diagnosis is supported by findings such as localized pain, swelling, erythema, warmth, and potentially fluctuance along the tendon's course, often confirmed by imaging (e.g., ultrasound, MRI) or surgical exploration.

• Ensure the documentation specifies "abscess" and not just "tenosynovitis" or "infection" to warrant this code.
• Verify the laterality (left) and anatomical site (ankle and foot) are explicitly stated.
• Do not confuse with M65.071 (right ankle and foot) or M65.079 (unspecified ankle and foot).