Trigger finger, unspecified index finger

This code describes a stenosing tenosynovitis affecting the flexor tendon of an unspecified index finger, characterized by a catching or locking sensation during finger flexion and extension. It results from inflammation and thickening of the tendon sheath, impeding smooth gliding of the tendon.

Use this code when documentation clearly indicates trigger finger affecting the index finger, but the specific hand (right or left) is not specified. This code is appropriate when the provider's notes confirm the diagnosis of trigger finger localized to the index digit without laterality.

• Ensure documentation specifies "index finger" to differentiate from other digits.
• Avoid using this code if laterality (right or left) is documented; instead, select the more specific M65.321 or M65.322.
• Review for any associated conditions, such as diabetes or rheumatoid arthritis, which may require additional coding.