2026 ICD-10-CM Diagnosis Code M41.124Adolescent idiopathic scoliosis, thoracic region

ICD-10-CM Codes›M00–M99›M40-M43›M41

ICD-10-CM M41.124
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M41.124 is a billable ICD-10-CM diagnosis code for adolescent idiopathic scoliosis, thoracic region. 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. Coders also document this condition as adolescent idiopathic scoliosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Scoliosis and other postural dorsopathic deformities.

Code Identity

ICD-10-CM Code
M41.124
Billable Status
Yes — Valid for Submission
Code Describes
Adolescent idiopathic scoliosis, thoracic region
Short Description
Adolescent idiopathic scoliosis, thoracic region
Same as the full description in the CMS dataset.
Parent Code
M41.12
Adolescent idiopathic scoliosis

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM40-M43Deforming dorsopathies
CategoryM41Scoliosis
This CodeM41.124Adolescent idiopathic scoliosis, thoracic region

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adolescent idiopathic scoliosis
  • Adolescent idiopathic scoliosis of thoracic spine
  • Idiopathic scoliosis of thoracic spine

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 M41.124 to ICD-9-CMHistory

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

ICD-9-CM
737.30 Idiopathic 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 M41.124Overview

What is the ICD-10 code for adolescent idiopathic scoliosis, thoracic region?

The ICD-10-CM code for adolescent idiopathic scoliosis, thoracic region is M41.124 (sometimes written as M41124). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is M41.124 (Adolescent idiopathic scoliosis) a billable code?

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

What MS-DRG does M41.124 group to?

When adolescent idiopathic scoliosis, thoracic region 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 M41.124?

Under the General Equivalence Mappings, adolescent idiopathic scoliosis, thoracic region converts to ICD-9-CM 737.30 (idiopathic scoliosis). The mapping is approximate, so confirm the match fits the documentation.