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

This code signifies an injury to any of the small, deep muscles, their surrounding connective tissue, or their tendons located within the left hand, specifically affecting the thumb. This includes structures like the thenar muscles (e.g., abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) and their associated fascia and tendons. The injury is to a specific, non-ruptured intrinsic structure not otherwise classified.

Apply this code for initial encounters involving a diagnosed strain, sprain, tear (not complete rupture), or other specified trauma to an intrinsic muscle, fascia, or tendon of the left thumb. This is appropriate when the injury is clearly localized to the hand/wrist level and is not a complete avulsion or rupture. Examples include a partial tear of the abductor pollicis brevis or a sprain of the thenar fascia.

• Ensure the documentation specifies the left thumb and an intrinsic muscle, fascia, or tendon.
• Verify the injury is "other specified" and not a complete rupture (which would use a different code).
• Confirm this is the initial encounter for the injury; subsequent care would require a different seventh character.