Disp fx of distal phalanx of unspecified thumb, sequela

This code signifies a past injury involving a displaced break in the outermost bone of the thumb, where the specific thumb (left or right) was not documented at the time of the initial injury. The "sequela" designation indicates that this code is used for conditions or complications arising directly from the original fracture, after the acute phase of healing has passed. This could include chronic pain, nonunion, malunion, or functional impairment.

Apply this code when documenting a patient encounter for a long-term complication or residual effect stemming from a previously sustained, displaced fracture of the distal phalanx of an unspecified thumb. This is appropriate for follow-up visits addressing issues like persistent stiffness, deformity, or nerve damage directly attributable to the old fracture. Do not use this code for the initial treatment of an acute fracture.

• Always ensure documentation clearly links the current condition to the previous fracture.
• Look for terms like "history of," "due to old fracture," or "sequela of" in the physician's notes.
• If the laterality of the thumb is known at the time of the sequela encounter, a more specific code (e.g., S62.521S or S62.522S) should be used instead.