Nondisp longitud fx l patella, subs for clos fx w nonunion

This code describes a fracture of the kneecap on the left side that runs lengthwise and has not shifted out of alignment. The key clinical aspect is that the bone fragments have failed to heal together after an initial treatment, and the patient is now presenting for ongoing management of this nonunion.

Apply this code when a patient with a previously diagnosed nondisplaced longitudinal fracture of the left patella is seen for follow-up care, and imaging or clinical assessment confirms that the fracture has not united. This would be used for subsequent visits related to the nonunion, such as for evaluation of pain, limited mobility, or planning for further intervention.

• Ensure documentation clearly states "nonunion" for the fracture.
• Confirm the fracture is specifically "nondisplaced" and "longitudinal" to the left patella.
• This seventh character 'K' indicates a subsequent encounter for a closed fracture with nonunion.