Nondisp posterior arch fx first cervcal vertebra, sequela

This code describes a long-term effect or complication arising from a previously sustained, nondisplaced fracture of the posterior arch of the C1 vertebra. It indicates that the initial injury has healed, but the patient is still experiencing residual symptoms or conditions directly attributable to that past fracture.

Use this code when a patient presents with a current condition or symptom that is a direct consequence of a healed, nondisplaced posterior arch fracture of the first cervical vertebra. Documentation should clearly link the current complaint to the historical C1 fracture and specify that the fracture itself is no longer acute. Examples include chronic pain, nerve impingement, or instability directly resulting from the old injury.

• Requires a seventh character "S" to indicate sequela, meaning the patient is seen for a complication or late effect of the initial injury.
• Do not use for acute or subacute fractures; those would use different seventh characters (A, D, G, K, P).
• Always sequence this code first if the sequela is the primary reason for the encounter, followed by codes for the specific residual condition(s).