2026 ICD-10-CM Diagnosis Code M99.03Segmental and somatic dysfunction of lumbar region

ICD-10-CM Codes›M00–M99›M99›M99

ICD-10-CM M99.03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M99.03 is a billable ICD-10-CM diagnosis code for segmental and somatic dysfunction of lumbar 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. Coders also document this condition as ERS-extended, rotated, and sidebent vertebral position. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Biomechanical lesions.

Code Identity

ICD-10-CM Code
M99.03
Billable Status
Yes — Valid for Submission
Code Describes
Segmental and somatic dysfunction of lumbar region
Short Description
Segmental and somatic dysfunction of lumbar region
Same as the full description in the CMS dataset.
Parent Code
M99.0
Segmental and somatic dysfunction

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM99Biomechanical lesions, not elsewhere classified
CategoryM99Biomechanical lesions, not elsewhere classified
This CodeM99.03Segmental and somatic dysfunction of lumbar region

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • ERS-extended, rotated, and sidebent vertebral position
  • FRS - flexed, rotated, and sidebent vertebral position
  • Lumbar segmental dysfunction
  • NSR-neutral, sidebent, and rotated vertebral position
  • Psoas syndrome
  • Somatic dysfunction of lumbar region
  • Somatic dysfunction of lumbosacral region
  • Somatic dysfunction of thoracic region
  • Somatic dysfunction of thoracolumbar region

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.

    • Dysfunction
      • somatic
        • lumbar region
    • Dysfunction
      • somatic
        • lumbosacral

Clinical ClassificationClinical

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

CCSR MUS012
Biomechanical lesions
Default principal diagnosis: inpatient Yes · outpatient Yes

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 M99.03 to ICD-9-CMHistory

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

ICD-9-CM
739.3 Somat dysfunc lumbar reg
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 M99.03Overview

Is M99.03 (Segmental and somatic dysfunction) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report segmental and somatic dysfunction of lumbar region on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M99.03 group to?

When segmental and somatic dysfunction of lumbar 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 M99.03?

Under the General Equivalence Mappings, segmental and somatic dysfunction of lumbar region converts to ICD-9-CM 739.3 (somat dysfunc lumbar reg). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.