Unsp inj extn musc/fasc/tend r lit fngr at wrs/hnd lv, subs

This code signifies an unspecific injury to the extensor muscle, fascia, or tendon of the right little finger. The injury is located at the wrist or hand level and is being treated during a subsequent encounter, meaning the patient is receiving active treatment for the injury after the initial phase of care.

This code is appropriate for follow-up visits where a patient is receiving ongoing treatment (e.g., physical therapy, wound care, medication management) for an ill-defined extensor injury of the right little finger. It is used when the specific nature of the injury (e.g., strain, tear) is not documented or known.

• Ensure documentation clearly indicates the injury is to the right little finger extensor mechanism at the wrist/hand level.
• Verify that the encounter is for subsequent care, not the initial treatment or sequela.
• Avoid this code if a more specific injury (e.g., S66.316D for strain) is documented.