2026 ICD-10-CM Diagnosis Code M47.9Spondylosis, unspecified

ICD-10-CM Codes›M00–M99›M45-M49›M47

ICD-10-CM M47.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M47.9 is a billable ICD-10-CM diagnosis code for spondylosis, unspecified. 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
M47.9
Billable Status
Yes — Valid for Submission
Code Describes
Spondylosis, unspecified
Short Description
Spondylosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
M47
Spondylosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM45-M49Spondylopathies
CategoryM47Spondylosis
This CodeM47.9Spondylosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis of facet joint of lumbar spine
  • Arthritis of facet joint of thoracic spine
  • Arthropathy of lumbar facet joint
  • Bony swelling of cervical spine
  • Bony swelling of finger
  • Bony swelling of thumb
  • Bony swelling of toe joint
  • Cervical spine - swollen
  • Degeneration of spine
  • Degenerative kyphosis
  • Foot joint swelling
  • Instability of spine due to degeneration of spine
  • Neck swelling
  • Osteoarthritis of facet joint of thoracic spine
  • Osteoarthritis of lumbar spinal facet joint
  • Osteoarthritis of lumbar spine
  • Osteoarthritis of spinal facet joint
  • Osteoarthritis of spine
  • Osteoarthritis of thoracic spine
  • Secondary kyphosis
  • Spondylosis
  • Spondylosis and allied disorders
  • Spondylosis due to another disorder
  • Swelling of toe joint
  • Swollen thumb

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Spondylosis

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

Spine Injuries and Disorders

Your backbone, or spine, is made up of 26 bone discs called vertebrae. The vertebrae protect your spinal cord and allow you to stand and bend. A number of problems can change the structure of the spine or damage the vertebrae and surrounding tissue. They include:

Read the full article at MedlinePlus

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

Convert M47.9 to ICD-9-CMHistory

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

ICD-9-CM
721.90 Spondylos NOS w/o myelop
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 M47.9Overview

Is M47.9 (Spondylosis) a billable code?

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

What MS-DRG does M47.9 group to?

When spondylosis, unspecified 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 M47.9?

Under the General Equivalence Mappings, spondylosis, unspecified converts to ICD-9-CM 721.90 (spondylos NOS w/o myelop). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.