Fracture of unsp phalanx of unspecified thumb, sequela

This code signifies a fracture of any phalanx (proximal or distal) of either thumb, where the specific phalanx and laterality are not documented. The "S" seventh character indicates that this encounter is for the sequela (late effects) of the original injury, meaning the patient is presenting for complications or conditions arising from the healed or healing fracture, not the initial acute treatment.

Use this code when a patient presents with a long-term complication or residual condition directly attributable to a previously sustained, unspecified thumb phalanx fracture, and the specific phalanx or thumb (left/right) was not recorded in the original injury documentation. Examples include chronic pain, malunion, nonunion, or deformity resulting from the old fracture.

• Ensure the documentation clearly states the encounter is for a sequela, not the initial or subsequent acute treatment.
• Avoid using this code if the specific phalanx (e.g., proximal) or laterality (e.g., left thumb) is known; more specific codes are available.
• Always sequence this sequela code first, followed by any additional codes for the specific complication (e.g., M84.28 for nonunion).