Spontaneous rupture of other tendons, other sites

This code signifies a non-traumatic, sudden tearing of a tendon located in an anatomical region not specifically classified elsewhere. This rupture occurs without an external force or injury, often due to degenerative changes within the tendon structure.

Apply this code when documentation clearly states a spontaneous rupture of a tendon in sites such as the biceps, triceps, quadriceps, or patellar tendons, provided it's not explicitly categorized under other M66 codes. Supporting documentation should rule out any acute trauma as the cause of the rupture.

• Ensure the documentation specifies "spontaneous" or "non-traumatic" to differentiate from traumatic ruptures (S-codes).
• Verify the specific tendon involved and its anatomical location to ensure it's not covered by a more specific M66.x code.
• Do not use for traumatic tendon ruptures; those are classified to the S-code chapter based on the body region and type of injury.