Nondisp post arch fx first cervcal vertebra, init for opn fx

This code signifies a break in the posterior arch of the atlas (C1 vertebra) that has not shifted from its normal anatomical position. The fracture is an open type, meaning there is a communication between the fracture site and the external environment, and this is the initial encounter for treatment.

Apply this code for patients presenting with an open, nondisplaced fracture of the C1 posterior arch, such as from a diving accident or fall, requiring initial medical attention. Documentation should clearly state "open fracture," "nondisplaced," "posterior arch," and "C1" or "atlas," along with the encounter type.

• Ensure documentation explicitly states "open fracture" to differentiate from closed fractures.
• Verify the fracture is specifically of the posterior arch of C1, not other parts of the vertebra or other cervical levels.
• This "B" seventh character indicates an initial encounter for an open fracture; subsequent encounters will require different seventh characters.