Spontaneous rupture of extensor tendons, right upper arm

This code signifies a non-traumatic tear of the extensor tendons located in the right upper arm. This rupture occurs without an external force or injury, often due to underlying degenerative changes, inflammatory conditions, or chronic overuse. It results in a sudden loss of function and pain in the affected area.

Apply this code when documentation clearly indicates a spontaneous (non-traumatic) rupture of an extensor tendon in the patient's right upper arm. This diagnosis is typically supported by physical examination findings of a palpable defect, inability to extend the wrist or fingers, and imaging studies such as MRI confirming the tendon tear without evidence of acute trauma.

• Ensure documentation specifies "spontaneous" rupture to differentiate from traumatic tears (S46.8-).
• Verify the laterality (right upper arm) is clearly documented.
• Consider additional codes for any underlying conditions contributing to the spontaneous rupture, such as rheumatoid arthritis (M05.-) or chronic tendinopathy (M75.5-).