Oth disp fx of base of first MC bone, unsp hand, sequela

This code describes a long-term complication or late effect stemming from a previously sustained displaced fracture at the base of the first metacarpal bone (thumb). The specific hand is not documented, and the fracture is not a Bennett's or Rolando's fracture. This sequela could manifest as chronic pain, deformity, nonunion, malunion, or functional impairment.

Apply this code when documenting a patient encounter for the residual effects or complications of a past displaced fracture of the first metacarpal base, excluding Bennett's or Rolando's. This is appropriate for follow-up care long after the initial injury has healed, but its consequences persist.

• Always assign this code as a secondary diagnosis, following a code for the specific sequela (e.g., M20.00 for malunion, M96.0 for pseudarthrosis).
• Ensure documentation clearly indicates the fracture is "other" than Bennett's or Rolando's and that the encounter is for a late effect.
• Confirm the fracture was displaced and located at the base of the first metacarpal.