Spontaneous rupture of extensor tendons, right hand

This code signifies a non-traumatic tear of the extensor tendons in the right hand, occurring without an external force or injury. This typically results from underlying degenerative changes, inflammatory conditions (e.g., rheumatoid arthritis), or chronic overuse leading to tendon weakening and eventual rupture.

Use this code when documentation clearly states a spontaneous or non-traumatic rupture of one or more extensor tendons in the patient's right hand. This diagnosis is often supported by physical examination findings, patient history, and imaging studies confirming the tendon discontinuity without evidence of acute trauma.

• Differentiate from traumatic extensor tendon ruptures, which are coded under S66.4-.
• Ensure laterality (right hand) is explicitly documented to support this specific code.
• Look for associated conditions, such as rheumatoid arthritis (M05.-, M06.-), which may be sequenced as a primary diagnosis if it is the underlying cause of the spontaneous rupture.