Inj intrinsic musc/fasc/tend thmb at wrs/hnd lv, init

This code signifies an injury to a specific intrinsic muscle, fascia, or tendon within the thumb, located at the wrist or hand level, that doesn't fit into more precise categories. This injury is to the thumb's internal structures, rather than the larger, extrinsic muscles that originate in the forearm.

Use this code for a new patient encounter involving a sprain, strain, or tear of an intrinsic thumb muscle, fascia, or tendon when the exact muscle, fascia, or tendon is not specified in the documentation, or when the injury is to a less common intrinsic structure. This code is appropriate when the injury is clearly to the thumb's internal structures at the hand/wrist level, but a more granular code isn't available or supported.

• Ensure documentation specifies "unspecified thumb" and "wrist and hand level" for accurate application.
• Differentiate from injuries to extrinsic thumb muscles, which would be coded differently.
• Verify that the encounter is the initial treatment for this specific injury.