2026 ICD-10-CM Diagnosis Code M47.891Other spondylosis, occipito-atlanto-axial region

ICD-10-CM Codes›M00–M99›M45-M49›M47

ICD-10-CM M47.891
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M47.891 is a billable ICD-10-CM diagnosis code for other spondylosis, occipito-atlanto-axial region. 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 Spondylopathies/spondyloarthropathy (including infective).

Code Identity

ICD-10-CM Code
M47.891
Billable Status
Yes — Valid for Submission
Code Describes
Other spondylosis, occipito-atlanto-axial region
Short Description
Other spondylosis, occipito-atlanto-axial region
Same as the full description in the CMS dataset.
Parent Code
M47.89
Other spondylosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM45-M49Spondylopathies
CategoryM47Spondylosis
This CodeM47.891Other spondylosis, occipito-atlanto-axial region

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR MUS011
Spondylopathies/spondyloarthropathy (including infective)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Spondylosis

    a degenerative spinal disease that can involve any part of the vertebra, the intervertebral disk, and the surrounding soft tissue.

Patient EducationClinical

Neck Injuries and Disorders

Any part of your neck - muscles, bones, joints, tendons, ligaments, or nerves - can cause neck problems. Neck pain is very common. Pain may also come from your shoulder, jaw, head, or upper arms.

Read the full article at MedlinePlus

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

Convert M47.891 to ICD-9-CMHistory

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

ICD-9-CM
721.0 Cervical spondylosis
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 M47.891Overview

What is the ICD-10 code for other spondylosis, occipito-atlanto-axial region?

The ICD-10-CM code for other spondylosis, occipito-atlanto-axial region is M47.891 (sometimes written as M47891). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is M47.891 (Other spondylosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other spondylosis, occipito-atlanto-axial region on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M47.891 group to?

When other spondylosis, occipito-atlanto-axial region 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 M47.891?

Under the General Equivalence Mappings, other spondylosis, occipito-atlanto-axial region converts to ICD-9-CM 721.0 (cervical spondylosis). The mapping is approximate, so confirm the match fits the documentation.