2026 ICD-10-CM Diagnosis Code M41.9Scoliosis, unspecified

ICD-10-CM Codes›M00–M99›M40-M43›M41

ICD-10-CM M41.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M41.9 is a billable ICD-10-CM diagnosis code for scoliosis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 456 through 458, 551 through 552. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Scoliosis and other postural dorsopathic deformities.

Code Identity

ICD-10-CM Code
M41.9
Billable Status
Yes — Valid for Submission
Code Describes
Scoliosis, unspecified
Short Description
Scoliosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
M41
Scoliosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM40-M43Deforming dorsopathies
CategoryM41Scoliosis
This CodeM41.9Scoliosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired scoliosis
  • Blindness, scoliosis, arachnodactyly syndrome
  • Corkscrewing
  • Deformity of chest due to kyphoscoliosis
  • Dextroscoliosis
  • Early-onset scoliosis deformity of spine
  • Horizontal gaze palsy
  • Horizontal gaze palsy with progressive scoliosis
  • Kyphoscoliosis, lateral tongue atrophy, hereditary spastic paraplegia syndrome
  • Lordosis and scoliosis deformity of spine
  • Postural scoliosis
  • Restrictive lung disease
  • Restrictive lung disease due to kyphoscoliosis
  • Scoliosis deformity of spine
  • Scoliosis due to and following infection
  • Scoliosis of cervical spine

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.

    • Kyphoscoliosis, kyphoscoliotic(acquired)
    • Scoliosis(acquired) (postural)

Clinical ClassificationClinical

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

CCSR MUS022
Scoliosis and other postural dorsopathic deformities
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Scoliosis

    an appreciable lateral deviation in the normally straight vertical line of the spine. (dorland, 27th ed)

  • Congenital Postural Scoliosis

    abnormal sideways curvature of the spine that is present at birth.

  • Postural Scoliosis

    usually mild scoliosis that disappears when the person bends forward or sideways. the spine is structurally normal.

  • Restrictive Lung Disease

    decreased lung volume and inadequate ventilation due to parenchymal lung disorders (e.g., interstitial pulmonary fibrosis) or extrapulmonary disorders (e.g., scoliosis). patients present with shortness of breath and cough.

Patient EducationClinical

Scoliosis

Scoliosis causes a sideways curve of your backbone, or spine. These curves are often S- or C-shaped. Scoliosis is most common in late childhood and the early teens, when children grow fast. Girls are more likely to have it than boys. It can run in families. Symptoms include leaning to one side and having uneven shoulders and hips.

Read the full article at MedlinePlus

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

Convert M41.9 to ICD-9-CMHistory

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

ICD-9-CM
737.39 Scoliosis NEC
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 M41.9Overview

Is M41.9 (Scoliosis) a billable code?

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

What MS-DRG does M41.9 group to?

When scoliosis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 456, 457, 458, 551, 552, with relative weights from 0.9613 to 8.4034 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M41.9?

Under the General Equivalence Mappings, scoliosis, unspecified converts to ICD-9-CM 737.39 (scoliosis NEC). 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.