2026 ICD-10-CM Diagnosis Code M48.51XSCollapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture

ICD-10-CM Codes›M00–M99›M45-M49›M48

ICD-10-CM M48.51XS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M48.51XS is a billable ICD-10-CM diagnosis code for collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 551 through 552. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological, stress and atypical fractures, sequela.

Code Identity

ICD-10-CM Code
M48.51XS
Billable Status
Yes — Valid for Submission
Code Describes
Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture
Short Description
Collapsed vertebra, NEC, occipt-atlan-ax region, sqla
Parent Code
M48.51
Collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM45-M49Spondylopathies
CategoryM48Other spondylopathies
This CodeM48.51XSCollapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS020
Pathological, stress and atypical fractures, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Fractures

A fracture is a break in a bone. Fractures are usually caused by injuries. Since they can sometimes be serious, it's important to get medical care right away if you think you have a fracture.

The full article covers:

  • What is a fracture?
  • What are the different types of fractures?
  • What causes fractures?
  • What are the symptoms of a fracture?
  • How are fractures diagnosed?
  • What are the treatments for fractures?
  • Can fractures be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M48.51XS to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
905.1 Late eff spine/trunk fx
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M48.51XSOverview

Is M48.51XS a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in M48.51XS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region itself has resolved, not the original event.

What MS-DRG does M48.51XS group to?

When collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture is the principal diagnosis on an inpatient stay, it groups to MS-DRG 551, 552, with relative weights from 0.9613 to 1.6761 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M48.51XS?

Under the General Equivalence Mappings, collapsed vertebra, not elsewhere classified, occipito-atlanto-axial region, sequela of fracture converts to ICD-9-CM 905.1 (late eff spine/trunk fx). The mapping is approximate, so confirm the match fits the documentation.