Nondisp post arch fx 1st cervcal vert, 7thG

This code describes a fracture located on the posterior arch of the atlas (C1 vertebra) that has not shifted from its anatomical position. The patient is in a subsequent phase of care, and the fracture is exhibiting a slower-than-expected healing process.

Apply this code when a patient presents for follow-up care of a previously diagnosed C1 posterior arch fracture that is not displaced, and the physician's documentation explicitly states "delayed healing." This indicates the fracture is taking longer than anticipated to unite.

• Requires documentation of "delayed healing" for the subsequent encounter.
• Distinguish from nonunion (S12.031K) or malunion (S12.031P), which represent different healing complications.
• Always sequence after the initial encounter code for the fracture, if applicable, or as the primary diagnosis if the delayed healing is the focus of the current visit.