M66.321
ICD-10-CMThis code signifies a non-traumatic tear of a flexor tendon located in the patient's right upper arm. This rupture occurs without an external force or injury, often due to underlying degenerative changes, inflammatory conditions, or chronic overuse.
Apply this code when documentation clearly states a spontaneous (atraumatic) rupture of a flexor tendon in the right upper arm. This typically involves conditions like tendinopathy or inflammatory arthritis leading to tendon failure. Supporting documentation should specify the laterality and the spontaneous nature of the rupture.
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