2026 ICD-10-CM Diagnosis Code M46Other inflammatory spondylopathies

ICD-10-CM Codes›M00–M99›M45-M49›M46

ICD-10-CM M46
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M46 is a non-billable ICD-10-CM category code for other inflammatory spondylopathies, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M46.00, M46.01, M46.02, and M46.03.

Code Identity

ICD-10-CM Code
M46
Billable Status
No — Non-Billable Category
Code Describes
Other inflammatory spondylopathies
Short Description
Other inflammatory spondylopathies
Same as the full description in the CMS dataset.
Chapter
M45-M49
Spondylopathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM45-M49Spondylopathies
CategoryM46Other inflammatory spondylopathies
This CodeM46Other inflammatory spondylopathies

Specific Coding for Other inflammatory spondylopathiesOverview

Non-specific codes like M46 require more characters. Use one of these billable codes instead:

  • M46.0 for Spinal enthesopathy

  • Use M46.00 for Spinal enthesopathy, site unspecified

  • Use M46.01 for Spinal enthesopathy, occipito-atlanto-axial region

  • Use M46.02 for Spinal enthesopathy, cervical region

  • Use M46.03 for Spinal enthesopathy, cervicothoracic region

  • Use M46.04 for Spinal enthesopathy, thoracic region

  • Use M46.05 for Spinal enthesopathy, thoracolumbar region

  • Use M46.06 for Spinal enthesopathy, lumbar region

  • Use M46.07 for Spinal enthesopathy, lumbosacral region

  • Use M46.08 for Spinal enthesopathy, sacral and sacrococcygeal region

  • Use M46.09 for Spinal enthesopathy, multiple sites in spine

  • Use M46.1 for Sacroiliitis, not elsewhere classified

  • M46.2 for Osteomyelitis of vertebra

  • Use M46.20 for Osteomyelitis of vertebra, site unspecified

  • Use M46.21 for Osteomyelitis of vertebra, occipito-atlanto-axial region

  • Use M46.22 for Osteomyelitis of vertebra, cervical region

  • Use M46.23 for Osteomyelitis of vertebra, cervicothoracic region

  • Use M46.24 for Osteomyelitis of vertebra, thoracic region

  • Use M46.25 for Osteomyelitis of vertebra, thoracolumbar region

  • Use M46.26 for Osteomyelitis of vertebra, lumbar region

  • Use M46.27 for Osteomyelitis of vertebra, lumbosacral region

  • Use M46.28 for Osteomyelitis of vertebra, sacral and sacrococcygeal region

  • M46.3 for Infection of intervertebral disc (pyogenic)

  • Use M46.30 for Infection of intervertebral disc (pyogenic), site unspecified

  • Use M46.31 for Infection of intervertebral disc (pyogenic), occipito-atlanto-axial region

  • Use M46.32 for Infection of intervertebral disc (pyogenic), cervical region

  • Use M46.33 for Infection of intervertebral disc (pyogenic), cervicothoracic region

  • Use M46.34 for Infection of intervertebral disc (pyogenic), thoracic region

  • Use M46.35 for Infection of intervertebral disc (pyogenic), thoracolumbar region

  • Use M46.36 for Infection of intervertebral disc (pyogenic), lumbar region

  • Use M46.37 for Infection of intervertebral disc (pyogenic), lumbosacral region

  • Use M46.38 for Infection of intervertebral disc (pyogenic), sacral and sacrococcygeal region

  • Use M46.39 for Infection of intervertebral disc (pyogenic), multiple sites in spine

  • M46.4 for Discitis, unspecified

  • Use M46.40 for Discitis, unspecified, site unspecified

  • Use M46.41 for Discitis, unspecified, occipito-atlanto-axial region

  • Use M46.42 for Discitis, unspecified, cervical region

  • Use M46.43 for Discitis, unspecified, cervicothoracic region

  • Use M46.44 for Discitis, unspecified, thoracic region

  • Use M46.45 for Discitis, unspecified, thoracolumbar region

  • Use M46.46 for Discitis, unspecified, lumbar region

  • Use M46.47 for Discitis, unspecified, lumbosacral region

  • Use M46.48 for Discitis, unspecified, sacral and sacrococcygeal region

  • Use M46.49 for Discitis, unspecified, multiple sites in spine

  • M46.5 for Other infective spondylopathies

  • Use M46.50 for Other infective spondylopathies, site unspecified

  • Use M46.51 for Other infective spondylopathies, occipito-atlanto-axial region

  • Use M46.52 for Other infective spondylopathies, cervical region

  • Use M46.53 for Other infective spondylopathies, cervicothoracic region

  • Use M46.54 for Other infective spondylopathies, thoracic region

  • Use M46.55 for Other infective spondylopathies, thoracolumbar region

  • Use M46.56 for Other infective spondylopathies, lumbar region

  • Use M46.57 for Other infective spondylopathies, lumbosacral region

  • Use M46.58 for Other infective spondylopathies, sacral and sacrococcygeal region

  • Use M46.59 for Other infective spondylopathies, multiple sites in spine

  • M46.8 for Other specified inflammatory spondylopathies

  • Use M46.80 for Other specified inflammatory spondylopathies, site unspecified

  • Use M46.81 for Other specified inflammatory spondylopathies, occipito-atlanto-axial region

  • Use M46.82 for Other specified inflammatory spondylopathies, cervical region

  • Use M46.83 for Other specified inflammatory spondylopathies, cervicothoracic region

  • Use M46.84 for Other specified inflammatory spondylopathies, thoracic region

  • Use M46.85 for Other specified inflammatory spondylopathies, thoracolumbar region

  • Use M46.86 for Other specified inflammatory spondylopathies, lumbar region

  • Use M46.87 for Other specified inflammatory spondylopathies, lumbosacral region

  • Use M46.88 for Other specified inflammatory spondylopathies, sacral and sacrococcygeal region

  • Use M46.89 for Other specified inflammatory spondylopathies, multiple sites in spine

  • M46.9 for Unspecified inflammatory spondylopathy

  • Use M46.90 for Unspecified inflammatory spondylopathy, site unspecified

  • Use M46.91 for Unspecified inflammatory spondylopathy, occipito-atlanto-axial region

  • Use M46.92 for Unspecified inflammatory spondylopathy, cervical region

  • Use M46.93 for Unspecified inflammatory spondylopathy, cervicothoracic region

  • Use M46.94 for Unspecified inflammatory spondylopathy, thoracic region

  • Use M46.95 for Unspecified inflammatory spondylopathy, thoracolumbar region

  • Use M46.96 for Unspecified inflammatory spondylopathy, lumbar region

  • Use M46.97 for Unspecified inflammatory spondylopathy, lumbosacral region

  • Use M46.98 for Unspecified inflammatory spondylopathy, sacral and sacrococcygeal region

  • Use M46.99 for Unspecified inflammatory spondylopathy, multiple sites in spine

Patient EducationClinical

Ankylosing Spondylitis

Ankylosing spondylitis (AS) is a type of arthritis of the spine. It causes inflammation (swelling) between your vertebrae (the bones that make up your spine) and the joints between your spine and pelvis. AS inflammation can cause stiffness and make it difficult to move and bend.

The full article covers:

  • What is ankylosing spondylitis?
  • Who is more likely to get ankylosing spondylitis?
  • What causes ankylosing spondylitis?
  • What are the symptoms of ankylosing spondylitis?
  • How is ankylosing spondylitis diagnosed?
  • What are the treatments for ankylosing spondylitis?

Read the full article at MedlinePlus

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

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 M46Overview

Is M46 (Other inflammatory spondylopathies) a billable code?

No. This is a category header that groups the codes for other inflammatory spondylopathies, and headers cannot be submitted on claims. Claims for other inflammatory spondylopathies need a more specific code from this category, such as M46.00, M46.01, and M46.02.