Traumatic spondylopathy localized to the occipito-atlanto-axial region — the articulations between the occiput, atlas (C1), and axis (C2) — resulting from trauma rather than a degenerative or inflammatory process.

Documentation tips

What should appear in the chart to support M48.31.

Source · Editorial brief grounded in 4 cited references ↓

• Document the inciting traumatic event explicitly — date, mechanism (e.g., MVA, fall from height), and how it relates to the current structural findings.
• Record imaging modality and findings: CT or MRI evidence of structural change at the occiput–C1–C2 complex (subluxation, ligamentous laxity, bony remodeling, os odontoideum) that supports a spondylopathic diagnosis rather than acute fracture.
• Distinguish the encounter phase: M48.31 applies to the chronic/residual phase of traumatic spondylopathy, not the initial acute injury — note in the record that the acute injury has been previously addressed and the current visit addresses ongoing spondylopathic disease.
• Capture neurologic status: document presence or absence of myelopathy, radiculopathy, or instability symptoms, as these may warrant additional codes and affect medical necessity for advanced imaging or surgical intervention.
• If conservative care has been attempted, document type, duration, and response — this supports surgical authorization and payer medical-necessity review.

Related CPT procedures

Procedure codes commonly billed with M48.31. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M48.31 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Using M48.31 during the initial acute injury encounter — acute traumatic injuries to this region should be coded with the appropriate S13.x or S14.x codes with the 7th character 'A'; M48.31 is for the post-acute spondylopathic sequela.
• Confusing M48.31 with M48.30 (site unspecified) when the level is clearly documented in imaging or operative notes — always code to the highest specificity.
• Appending a 7th-character extension to M48.31 — the M48.3x traumatic spondylopathy subcategory does not use 7th characters; only M48.4x and M48.5x fracture codes require them.
• Failing to sequence external cause codes when the payer or trauma registry requires them — while not mandatory for all payers, documenting the mechanism of injury supports claims processing and coordination of benefits.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

Sibling codes

Other billable codes under M48.3 (laterality / anatomic variants).