Strain of unsp musc/fasc/tend at forarm lv, left arm, subs

This code signifies a muscle, fascia, or tendon strain in the left forearm where the specific affected structure is not documented. It indicates that the patient is receiving follow-up care for this injury, such as during a re-evaluation, cast change, or physical therapy session.

Apply this code when a patient presents for subsequent treatment of a left forearm strain, and the medical record does not specify which particular muscle, fascia, or tendon is involved. This is appropriate for ongoing management after the initial diagnosis.

• Ensure the documentation clearly states "left arm" and "forearm level" for laterality and anatomical site.
• Confirm the encounter type is "subsequent" (e.g., follow-up, rehabilitation) and not the initial injury visit.
• If the specific muscle, fascia, or tendon is identified, a more precise code from the S56 series should be used.