2027 ICD-10-CM Diagnosis Code M40Kyphosis and lordosis

ICD-10-CM Codes›M00–M99›M40-M43›M40

ICD-10-CM M40
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M40 is a non-billable ICD-10-CM category code for kyphosis and lordosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M40.00, M40.03, M40.04, and M40.05.

Code Identity

ICD-10-CM Code
M40
Billable Status
No — Non-Billable Category
Code Describes
Kyphosis and lordosis
Short Description
Kyphosis and lordosis
Same as the full description in the CMS dataset.
Chapter
M40-M43
Deforming dorsopathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM40-M43Deforming dorsopathies
CategoryM40Kyphosis and lordosis
This CodeM40Kyphosis and lordosis

Specific Coding for Kyphosis and lordosisOverview

Non-specific codes like M40 require more characters. Use one of these billable codes instead:

  • M40.0 for Postural kyphosis

  • Use M40.00 for Postural kyphosis, site unspecified

  • Use M40.03 for Postural kyphosis, cervicothoracic region

  • Use M40.04 for Postural kyphosis, thoracic region

  • Use M40.05 for Postural kyphosis, thoracolumbar region

  • M40.1 for Other secondary kyphosis

  • Use M40.10 for Other secondary kyphosis, site unspecified

  • Use M40.12 for Other secondary kyphosis, cervical region

  • Use M40.13 for Other secondary kyphosis, cervicothoracic region

  • Use M40.14 for Other secondary kyphosis, thoracic region

  • Use M40.15 for Other secondary kyphosis, thoracolumbar region

  • M40.2 for Other and unspecified kyphosis

  • M40.20 for Unspecified kyphosis

  • M40.29 for Other kyphosis

  • M40.3 for Flatback syndrome

  • Use M40.30 for Flatback syndrome, site unspecified

  • Use M40.35 for Flatback syndrome, thoracolumbar region

  • Use M40.36 for Flatback syndrome, lumbar region

  • Use M40.37 for Flatback syndrome, lumbosacral region

  • M40.4 for Postural lordosis

  • Use M40.40 for Postural lordosis, site unspecified

  • Use M40.45 for Postural lordosis, thoracolumbar region

  • Use M40.46 for Postural lordosis, lumbar region

  • Use M40.47 for Postural lordosis, lumbosacral region

  • M40.5 for Lordosis, unspecified

  • Use M40.50 for Lordosis, unspecified, site unspecified

  • Use M40.55 for Lordosis, unspecified, thoracolumbar region

  • Use M40.56 for Lordosis, unspecified, lumbar region

  • Use M40.57 for Lordosis, unspecified, lumbosacral region

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M40: its own notes plus those printed at Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • congenital kyphosis and lordosis (Q76.4)
  • kyphoscoliosis (M41.-)
  • postprocedural kyphosis and lordosis (M96.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying disease

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M40, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming M40: its condition is not part of those codes, and both may be reported when the patient has both.

  • M43.8 Other specified deforming dorsopathies
    kyphosis and lordosis (M40.-)

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M40Overview

What is the ICD-10 code for kyphosis and lordosis?

M40 is the ICD-10-CM category for kyphosis and lordosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is M40 (Kyphosis and lordosis) a billable code?

No. This is a category header that groups the codes for kyphosis and lordosis, and headers cannot be submitted on claims. Claims for kyphosis and lordosis need a more specific code from this category, such as M40.00, M40.03, and M40.04.

Can M40 be reported with Q76.4?

Not as a rule. The Excludes1 note on M40 lists "congenital kyphosis and lordosis (Q76.4)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is coded first with M40?

The Code First note reads: underlying disease. When one of these applies, it is sequenced before M40.