Oth disp fx of second cervcal vert, subs for fx w nonunion

This code signifies a fracture of the second cervical vertebra (C2), specifically an "other displaced" type, meaning it doesn't fit into more specific categories like hangman's or odontoid fractures. The "subsequent encounter for fracture with nonunion" indicates that the patient is receiving ongoing care for this C2 fracture, and the bone fragments have failed to heal properly after an initial treatment.

This code is appropriate for follow-up visits where a patient with a previously diagnosed and treated displaced C2 fracture is being managed for nonunion. Documentation should clearly state the C2 fracture, its displaced nature, and the ongoing issue of nonunion, often supported by imaging studies confirming the lack of bone healing.

• Ensure documentation explicitly states "nonunion" for the C2 fracture; otherwise, a code for routine healing might be more appropriate.
• Distinguish this from malunion (S12.190P), where the bone has healed but in an incorrect anatomical position.
• Always sequence this code after any acute fracture codes if the nonunion is being treated concurrently with a new injury.