External constriction of unspecified thumb, sequela

This code indicates a long-term or late effect resulting from an external constriction affecting an unspecified thumb. This could be a scar, deformity, or functional impairment that persists after the initial injury or condition causing the constriction has resolved.

Apply this code when documenting a current condition of the thumb that is a residual effect of a past external constriction. This is appropriate for follow-up encounters where the sequela is being treated or evaluated, rather than the acute constriction itself.

• Always assign a secondary code to describe the specific nature of the sequela (e.g., scar, deformity).
• Ensure the documentation clearly links the current thumb condition to a previous external constriction.
• Do not use for acute or active external constriction; this code is exclusively for late effects.