DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M40 Kyphosis and lordosis

  • Header · not billable

M40 is not billable. The category heads 31 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M40-M43 Deforming dorsopathies (M40-M43)
  3. M40 Kyphosis and lordosis
Billable codes
31
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
31

Codes in M40

  1. M40.0
    Postural kyphosis
    Header
    Excludes1 1

    Excludes1

    • osteochondrosis of spine (M42.-) M42
  2. M40.00
    Postural kyphosis, site unspecified
    Billable
  3. M40.03
    Postural kyphosis, cervicothoracic region
    Billable
  4. M40.04
    Postural kyphosis, thoracic region
    Billable
  5. M40.05
    Postural kyphosis, thoracolumbar region
    Billable
  6. M40.1
    Other secondary kyphosis
    Header
  7. M40.10
    Other secondary kyphosis, site unspecified
    Billable
  8. M40.12
    Other secondary kyphosis, cervical region
    Billable
  9. M40.13
    Other secondary kyphosis, cervicothoracic region
    Billable
  10. M40.14
    Other secondary kyphosis, thoracic region
    Billable
  11. M40.15
    Other secondary kyphosis, thoracolumbar region
    Billable
  12. M40.2
    Other and unspecified kyphosis
    Header
  13. M40.20
    Unspecified kyphosis
    Header
  14. M40.202
    Unspecified kyphosis, cervical region
    Billable
  15. M40.203
    Unspecified kyphosis, cervicothoracic region
    Billable
  16. M40.204
    Unspecified kyphosis, thoracic region
    Billable
  17. M40.205
    Unspecified kyphosis, thoracolumbar region
    Billable
  18. M40.209
    Unspecified kyphosis, site unspecified
    Billable
  19. M40.29
    Other kyphosis
    Header
  20. M40.292
    Other kyphosis, cervical region
    Billable
  21. M40.293
    Other kyphosis, cervicothoracic region
    Billable
  22. M40.294
    Other kyphosis, thoracic region
    Billable
  23. M40.295
    Other kyphosis, thoracolumbar region
    Billable
  24. M40.299
    Other kyphosis, site unspecified
    Billable
  25. M40.3
    Flatback syndrome
    Header
  26. M40.30
    Flatback syndrome, site unspecified
    Billable
  27. M40.35
    Flatback syndrome, thoracolumbar region
    Billable
  28. M40.36
    Flatback syndrome, lumbar region
    Billable
  29. M40.37
    Flatback syndrome, lumbosacral region
    Billable
  30. M40.4
    Postural lordosis
    Header
    Inclusion terms 1

    Inclusion terms

    • Acquired lordosis
  31. M40.40
    Postural lordosis, site unspecified
    Billable
  32. M40.45
    Postural lordosis, thoracolumbar region
    Billable
  33. M40.46
    Postural lordosis, lumbar region
    Billable
  34. M40.47
    Postural lordosis, lumbosacral region
    Billable
  35. M40.5
    Lordosis, unspecified
    Header
  36. M40.50
    Lordosis, unspecified, site unspecified
    Billable
  37. M40.55
    Lordosis, unspecified, thoracolumbar region
    Billable
  38. M40.56
    Lordosis, unspecified, lumbar region
    Billable
  39. M40.57
    Lordosis, unspecified, lumbosacral region
    Billable

Sources of each column.

Instructions

At M40

Excludes1

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

Code first

  • underlying disease

Notes that also apply

Chapter 13 instructions (Notes 1, Excludes2 10): printed on the chapter 13 page.

Index entries

  • Kyphosis, kyphotic (acquired) → M40.209
  • Flatback syndrome → M40.30
  • Lordosis → M40.50
  • Kyphosis, kyphotic (acquired)postural (adolescent) → M40.00
  • Kyphosis, kyphotic (acquired)secondary NEC → M40.10
  • Kyphosis, kyphotic (acquired)cervical region → M40.202
  • Kyphosis, kyphotic (acquired)cervicothoracic region → M40.203
  • Kyphosis, kyphotic (acquired)thoracic region → M40.204
  • Kyphosis, kyphotic (acquired)thoracolumbar region → M40.205
  • Kyphosis, kyphotic (acquired)specified type NEC → M40.299
  • Flatback syndromethoracolumbar region → M40.35
  • Flatback syndromelumbar region → M40.36
  • Flatback syndromelumbosacral region → M40.37
  • Lordosisspecified type NEC → M40.40
  • Lordosisthoracolumbar region → M40.55
  • Lordosislumbar region → M40.56
  • Lordosislumbosacral region → M40.57
  • Kyphosis, kyphotic (acquired)postural (adolescent)cervicothoracic region → M40.03
  • Kyphosis, kyphotic (acquired)postural (adolescent)thoracic region → M40.04
  • Kyphosis, kyphotic (acquired)postural (adolescent)thoracolumbar region → M40.05
  • Kyphosis, kyphotic (acquired)secondary NECcervical region → M40.12
  • Kyphosis, kyphotic (acquired)secondary NECcervicothoracic region → M40.13
  • Kyphosis, kyphotic (acquired)secondary NECthoracic region → M40.14
  • Kyphosis, kyphotic (acquired)secondary NECthoracolumbar region → M40.15
  • Kyphosis, kyphotic (acquired)specified type NECcervical region → M40.292
  • Kyphosis, kyphotic (acquired)specified type NECcervicothoracic region → M40.293
  • Kyphosis, kyphotic (acquired)specified type NECthoracic region → M40.294
  • Kyphosis, kyphotic (acquired)specified type NECthoracolumbar region → M40.295
  • Lordosisspecified type NECthoracolumbar region → M40.45
  • Lordosisspecified type NEClumbar region → M40.46
  • Lordosisspecified type NEClumbosacral region → M40.47

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy