2026 ICD-10-CM Diagnosis Code M43.9Deforming dorsopathy, unspecified
ICD-10-CM Codes›M00–M99›M40-M43›M43
- Billable — Valid for Submission
- Chronic Condition
M43.9 is a billable ICD-10-CM diagnosis code for deforming dorsopathy, 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 Spondylopathies/spondyloarthropathy (including infective).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired curvature of spine
- Acquired deformity of spine
- Cervical spine deformity
- Curvature of spine
- Deformity of cervical vertebra
- Deformity of joint of thoracic spine
- Deformity of lumbar spine
- Deformity of spine
- Deformity of spine due to injury
- Deformity of thoracic spine
- Deformity of thoracic vertebra
- Effect of movement on spine deformity - finding
- Movement corrects spinal deformity
- Movement does not correct spinal deformity
- Movement does not reduce spinal deformity
- Movement reduces spinal deformity
- Spinal curvature convex to the left
- Spinal curvature convex to the right
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Curvature of spine NOS
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Dorsopathy - M53.9
- deforming - M43.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Dorsopathy
- deforming
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 M43.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M43.9Overview
Is M43.9 (Other deforming dorsopathies) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report deforming dorsopathy, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does M43.9 group to?
When deforming dorsopathy, 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 M43.9?
Under the General Equivalence Mappings, deforming dorsopathy, unspecified converts to ICD-9-CM 737.8 (curvature of spine 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.
