2026 ICD-10-CM Diagnosis Code M41.03Infantile idiopathic scoliosis, cervicothoracic region

ICD-10-CM Codes›M00–M99›M40-M43›M41

ICD-10-CM M41.03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M41.03 is a billable ICD-10-CM diagnosis code for infantile idiopathic scoliosis, cervicothoracic 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 idiopathic scoliosis of thoracic spine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Scoliosis and other postural dorsopathic deformities.

Code Identity

ICD-10-CM Code
M41.03
Billable Status
Yes — Valid for Submission
Code Describes
Infantile idiopathic scoliosis, cervicothoracic region
Short Description
Infantile idiopathic scoliosis, cervicothoracic region
Same as the full description in the CMS dataset.
Parent Code
M41.0
Infantile idiopathic scoliosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM40-M43Deforming dorsopathies
CategoryM41Scoliosis
This CodeM41.03Infantile idiopathic scoliosis, cervicothoracic region

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Idiopathic scoliosis of thoracic spine
  • Infantile idiopathic scoliosis of cervical spine
  • Infantile idiopathic scoliosis of cervicothoracic spine
  • Infantile idiopathic scoliosis of thoracic spine
  • 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.

    • Scoliosis(acquired) (postural)
      • idiopathic
        • infantile
          • cervicothoracic region

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

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 M41.03 to ICD-9-CMHistory

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

ICD-9-CM
737.31 Resolv idiopath scolios
Approximate The match is approximate rather than exact.
ICD-9-CM
737.32 Progr idiopath scoliosis
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 M41.03Overview

Is M41.03 (Infantile idiopathic scoliosis) a billable code?

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

What MS-DRG does M41.03 group to?

When infantile idiopathic scoliosis, cervicothoracic 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 M41.03?

Under the General Equivalence Mappings, infantile idiopathic scoliosis, cervicothoracic region converts to ICD-9-CM 737.31 (resolv idiopath scolios) and 737.32 (progr idiopath scoliosis). 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.