Posterior soft tissue impingement

This code describes a condition where soft tissues at the posterior aspect of a joint are compressed or entrapped, leading to pain and restricted movement. This impingement can involve various soft tissue structures such as synovium, capsule, or muscle, often occurring during extreme ranges of motion.

Use this code when documentation explicitly states posterior soft tissue impingement, particularly in joints like the ankle (e.g., posterior ankle impingement syndrome) or shoulder. Supporting documentation should detail the location of impingement, symptoms like pain with specific movements, and potentially imaging findings confirming soft tissue involvement.

• Ensure the documentation specifies "posterior" soft tissue impingement; other impingement locations have different codes.
• Do not confuse with bony impingement (e.g., M25.8_ for other specified joint disorders) or other types of soft tissue disorders.
• Always code the specific joint involved if further specificity is available (e.g., M26.82_ for a specific joint).