DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M45 Ankylosing spondylitis

  • Header · not billable

M45 is not billable. The category heads 20 billable codes in FY2027, grouped under 11 subdivisions.

Index → code

  • Spondylitis (chronic)ankylosing (chronic) → M45.9
  • Spondyloarthritisaxialnon-radiographic → M45.A0
  • Iridocyclitisin (due to)ankylosing spondylitis → M45.9

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M45-M49 Spondylopathies (M45-M49)
  3. M45 Ankylosing spondylitis
Billable codes
20
Subdivisions
11
CC / MCC codes
0 / 0
HCC V28 codes
20
New FY2027
0
Index entries
22

Codes in M45

  1. M45.0
    Ankylosing spondylitis of multiple sites in spine
    Billable93
  2. M45.1
    Ankylosing spondylitis of occipito-atlanto-axial region
    Billable93
  3. M45.2
    Ankylosing spondylitis of cervical region
    Billable93
  4. M45.3
    Ankylosing spondylitis of cervicothoracic region
    Billable93
  5. M45.4
    Ankylosing spondylitis of thoracic region
    Billable93
  6. M45.5
    Ankylosing spondylitis of thoracolumbar region
    Billable93
  7. M45.6
    Ankylosing spondylitis lumbar region
    Billable93
  8. M45.7
    Ankylosing spondylitis of lumbosacral region
    Billable93
  9. M45.8
    Ankylosing spondylitis sacral and sacrococcygeal region
    Billable93
  10. M45.9
    Ankylosing spondylitis of unspecified sites in spine
    Billable93
  11. M45.A
    Non-radiographic axial spondyloarthritis
    Header
  12. M45.A0
    Non-radiographic axial spondyloarthritis of unspecified sites in spine
    Billable93
  13. M45.A1
    Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region
    Billable93
  14. M45.A2
    Non-radiographic axial spondyloarthritis of cervical region
    Billable93
  15. M45.A3
    Non-radiographic axial spondyloarthritis of cervicothoracic region
    Billable93
  16. M45.A4
    Non-radiographic axial spondyloarthritis of thoracic region
    Billable93
  17. M45.A5
    Non-radiographic axial spondyloarthritis of thoracolumbar region
    Billable93
  18. M45.A6
    Non-radiographic axial spondyloarthritis of lumbar region
    Billable93
  19. M45.A7
    Non-radiographic axial spondyloarthritis of lumbosacral region
    Billable93
  20. M45.A8
    Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region
    Billable93
  21. M45.AB
    Non-radiographic axial spondyloarthritis of multiple sites in spine
    Billable93

Sources of each column.

Instructions

At M45

Inclusion terms

  • Rheumatoid arthritis of spine

Excludes1

  • arthropathy in Reiter's disease (M02.3-) M02.3
  • juvenile (ankylosing) spondylitis (M08.1) M08.1

Excludes2

  • Behçet's disease (M35.2) M35.2

Notes that also apply

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

Index entries

  • Spondylitis (chronic)ankylosing (chronic) → M45.9
  • Spondylitis (chronic)ankylosing (chronic)multiple sites → M45.0
  • Spondylitis (chronic)ankylosing (chronic)occipito-atlanto-axial region → M45.1
  • Spondylitis (chronic)ankylosing (chronic)cervical region → M45.2
  • Spondylitis (chronic)ankylosing (chronic)cervicothoracic region → M45.3
  • Spondylitis (chronic)ankylosing (chronic)thoracic region → M45.4
  • Spondylitis (chronic)ankylosing (chronic)thoracolumbar region → M45.5
  • Spondylitis (chronic)ankylosing (chronic)lumbar region → M45.6
  • Spondylitis (chronic)ankylosing (chronic)lumbosacral region → M45.7
  • Spondylitis (chronic)ankylosing (chronic)sacrococcygeal region → M45.8
  • Iridocyclitisin (due to)ankylosing spondylitis → M45.9
  • Spondylitis (chronic)ankylosing (chronic)with lung involvement → M45.9 [J99]
  • Spondyloarthritisaxialnon-radiographic → M45.A0
  • Spondyloarthritisaxialnon-radiographicoccipito-atlanto-axial region → M45.A1
  • Spondyloarthritisaxialnon-radiographiccervical → M45.A2
  • Spondyloarthritisaxialnon-radiographiccervicothoracic → M45.A3
  • Spondyloarthritisaxialnon-radiographicthoracic → M45.A4
  • Spondyloarthritisaxialnon-radiographicthoracolumbar → M45.A5
  • Spondyloarthritisaxialnon-radiographiclumbar → M45.A6
  • Spondyloarthritisaxialnon-radiographiclumbosacral → M45.A7
  • Spondyloarthritisaxialnon-radiographicsacral and sacrococcygeal → M45.A8
  • Spondyloarthritisaxialnon-radiographicmultiple sites → M45.AB

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

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