Spontaneous rupture of extensor tendons, left upper arm

This code signifies a non-traumatic tear of the extensor tendons located in the patient's left upper arm. This rupture occurs without external force or injury, often due to underlying degenerative changes, inflammatory conditions, or chronic overuse.

Apply this code when documentation clearly indicates a spontaneous (non-traumatic) rupture of any extensor tendon within the left upper arm region. Supporting documentation should specify the laterality and the absence of an acute injury event.

• Ensure documentation explicitly states "spontaneous" or "non-traumatic" to differentiate from traumatic ruptures.
• Verify laterality (left upper arm) is clearly documented.
• Do not confuse with traumatic extensor tendon ruptures (S46.8- series) or other non-traumatic tendon disorders like tendinitis.