Kyphosis and lordosis
In Deforming dorsopathies (M40-M43), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue
31 billable codes under M40: none are a CC or MCC; none map to an HCC.
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Instructional notes
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.
- Site and laterality (page 60)
- Acute traumatic versus chronic or recurrent musculoskeletal conditions (page 61)
- Coding of Pathologic Fractures (page 61)
- Osteoporosis (page 61)
- Multisystem Inflammatory Syndrome (page 62)
All codes under M40
M40 can't be used on a claim. Pick a billable code below; grey headings group them.
- M40.0Postural kyphosis
- M40.00Postural kyphosis, site unspecified
- M40.03Postural kyphosis, cervicothoracic region
- M40.04Postural kyphosis, thoracic region
- M40.05Postural kyphosis, thoracolumbar region
- M40.1Other secondary kyphosis
- M40.10Other secondary kyphosis, site unspecified
- M40.12Other secondary kyphosis, cervical region
- M40.13Other secondary kyphosis, cervicothoracic region
- M40.14Other secondary kyphosis, thoracic region
- M40.15Other secondary kyphosis, thoracolumbar region
- M40.2Other and unspecified kyphosis
- M40.20Unspecified kyphosis
- M40.202Unspecified kyphosis, cervical region
- M40.203Unspecified kyphosis, cervicothoracic region
- M40.204Unspecified kyphosis, thoracic region
- M40.205Unspecified kyphosis, thoracolumbar region
- M40.209Unspecified kyphosis, site unspecified
- M40.29Other kyphosis
- M40.292Other kyphosis, cervical region
- M40.293Other kyphosis, cervicothoracic region
- M40.294Other kyphosis, thoracic region
- M40.295Other kyphosis, thoracolumbar region
- M40.299Other kyphosis, site unspecified
- M40.3Flatback syndrome
- M40.30Flatback syndrome, site unspecified
- M40.35Flatback syndrome, thoracolumbar region
- M40.36Flatback syndrome, lumbar region
- M40.37Flatback syndrome, lumbosacral region
- M40.4Postural lordosis
- M40.40Postural lordosis, site unspecified
- M40.45Postural lordosis, thoracolumbar region
- M40.46Postural lordosis, lumbar region
- M40.47Postural lordosis, lumbosacral region
- M40.5Lordosis, unspecified
- M40.50Lordosis, unspecified, site unspecified
- M40.55Lordosis, unspecified, thoracolumbar region
- M40.56Lordosis, unspecified, lumbar region
- M40.57Lordosis, unspecified, lumbosacral region
M40 MS-DRGs
As the principal diagnosis, the billable codes under M40 group to MS-DRG 551, 552, 456, 457, or 458 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 551 Medical Back Problems with MCC (31 of 31 codes)
- DRG 552 Medical Back Problems without MCC (31 of 31 codes)
- DRG 456 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with MCC (24 of 31 codes)
- DRG 457 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection with CC (24 of 31 codes)
- DRG 458 Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, or Infection without CC/MCC (24 of 31 codes)
Other codes that refer to M40
Notes on these codes point to M40.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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 more about spine injuries and disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.