ICD-10-CM › M00-M99 › M45-M49 › M45 Ankylosing spondylitis › M45.4
Ankylosing spondylitis of thoracic region
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Ankylosing spondylitis of thoracic region
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from M45 Ankylosing spondylitis
Excludes1 - never coded here
- arthropathy in Reiter's disease (M02.3-)
- juvenile (ankylosing) spondylitis (M08.1)
Excludes2 - not included here
- Behçet's disease (M35.2)
Also known as
- Rheumatoid arthritis of spine
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Poker spine
- Fixation > joint
- Caplan's syndrome
- Rheumatism > gout
- Syndrome > Felty's
- Bony block of joint
- Bechterev's syndrome
- Bekhterev's syndrome
- Still-Felty syndrome
- Arthrofibrosis, joint
- Carditis > rheumatoid
- Fusion, fused > joint
- Strümpell-Marie spine
- Rheumatoid > arthritis
- Spondylitis > atrophic
- Syndrome > Still-Felty
- Vasculitis > rheumatoid
- Myocarditis > rheumatoid
- Rheumatoid > myocarditis
- Spondylitis > rheumatoid
- Endocarditis > rheumatoid
- Pericarditis > rheumatoid
- Rheumatoid > endocarditis
- Rheumatoid > pericarditis
- Spondylitis > rhizomelica
- Spondyloarthritis > axial
- Rheumatoid > polyarthritis
- Adhesions, adhesive > joint
- Felty's syndrome > vertebra
- Pneumoconiosis > rheumatoid
- Rheumatoid > lung > vertebra
- Spondylitis > ankylopoietica
- Spondylitis > Marie-Strümpell
- Disease, diseased > rheumatoid
- Ankylosis > spine > spondylitic
- Derangement > joint > ankylosis
- Arthritis, arthritic > rheumatic
- Rheumatoid > carditis > vertebra
- Rheumatoid > myopathy > vertebra
- Stiffness, joint NEC > ankylosis
Showing 40 of 69 index phrases.
Codes in the same group
| Code | Description | Status |
|---|---|---|
| M45.0 | Ankylosing spondylitis of multiple sites in spine | Valid |
| M45.1 | Ankylosing spondylitis of occipito-atlanto-axial region | Valid |
| M45.2 | Ankylosing spondylitis of cervical region | Valid |
| M45.3 | Ankylosing spondylitis of cervicothoracic region | Valid |
| M45.5 | Ankylosing spondylitis of thoracolumbar region | Valid |
| M45.6 | Ankylosing spondylitis lumbar region | Valid |
| M45.7 | Ankylosing spondylitis of lumbosacral region | Valid |
| M45.8 | Ankylosing spondylitis sacral and sacrococcygeal region | Valid |
| M45.9 | Ankylosing spondylitis of unspecified sites in spine | Valid |
| M45.A | Non-radiographic axial spondyloarthritis | Not billable |