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  6. 2026 ICD-10-CM Code M40

2026 ICD-10-CM Diagnosis Code M40

Kyphosis and lordosis

ICD-10-CM Code:
M40
ICD-10 Code for:
Kyphosis and lordosis
Is Billable?
Not Valid for Submission
Code Navigator:

M40 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity from the list below for a diagnosis of kyphosis and lordosis. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Kyphosis and lordosis

Non-specific codes like M40 require more digits to indicate the appropriate level of specificity. Consider using any of the following billable codes with a higher level of specificity when coding for kyphosis and lordosis:

  • 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

Code Classification

  • Diseases of the musculoskeletal system and connective tissue
    M00–M99
    • Deforming dorsopathies
      M40-M43
      • Kyphosis and lordosis
        M40

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • underlying disease

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • congenital kyphosis and lordosis Q76.4
  • kyphoscoliosis M41
  • postprocedural kyphosis and lordosis M96

Patient Education


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:

  • Infections
  • Injuries
  • Tumors
  • Conditions, such as ankylosing spondylitis and scoliosis
  • Bone changes that come with age, such as spinal stenosis and herniated disks

Spinal diseases often cause pain when bone changes put pressure on the spinal cord or nerves. They can also limit movement. Treatments differ by disease, but sometimes they include back braces and surgery.


[Learn More in MedlinePlus]

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.