Strain extn/abdr musc/fasc/tend of l thm at forarm lv, subs

This code signifies a non-traumatic injury to the extensor or abductor muscles, their associated fascia, or tendons of the left thumb, specifically at the forearm level. It indicates an overstretching or tearing of these tissues, resulting in pain and impaired function of the thumb and wrist.

This code is appropriate for follow-up encounters for patients receiving active treatment for a left thumb extensor/abductor strain at the forearm. This includes subsequent office visits, physical therapy sessions, or re-evaluations during the healing process. It should be used after the initial injury has been diagnosed and treated.

• Ensure documentation specifies "left thumb" and "forearm level" to support this specific code.
• Confirm the encounter is "subsequent" (D) and not initial (A) or sequela (S).
• Distinguish from sprains (ligamentous injury) or fractures, as this code is specific to muscle/tendon strain.