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ICD-10 diagnosis code

M45 Ankylosing spondylitis

This page in Swedish

M45 is the ICD-10 code for Ankylosing spondylitis. It is a three-character category. WHO defines its fourth-character subdivisions once for the whole group of categories; the national editions below list them in full. It belongs to the block M45–M49 (Spondylopathies) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.

Code type
Category (3 characters)
Chapter
XIII · M00–M99
Classification
WHO ICD-10, 2019 version

What M45 includes

Conditions and terms that are coded here.

  • Rheumatoid arthritis of spine

What M45 excludes

Conditions that look similar but belong under another code.

  • arthropathy in Reiter disease M02.3
  • Behçet disease M35.2
  • juvenile (ankylosing) spondylitis M08.1

M45 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

M45Ankyloserande spondylit [Bechterews sjukdom]

  • M45.9Ankyloserande spondylit [Bechterews sjukdom]
NorwayICD-10-NO

M45Ankyloserende spondylitt

DenmarkICD-10-DK

DM45Spondylitis ankylopoietica

  • DM459Ankyloserende spondylitis
FinlandICD-10-FI

M45Selkärankareuma

GermanyICD-10-GM

M45Spondylitis ankylosans

  • M45.0Spondylitis ankylosans
FranceICD-10-FR

M45Spondylarthrite ankylosante

NetherlandsICD-10-NL

M45spondylitis ankylopoetica [Bechterew]

United StatesICD-10-CM

Listed through more specific codes:

  • M45.0Ankylosing spondylitis of multiple sites in spine
  • M45.1Ankylosing spondylitis of occipito-atlanto-axial region
  • M45.2Ankylosing spondylitis of cervical region
  • M45.3Ankylosing spondylitis of cervicothoracic region
  • M45.4Ankylosing spondylitis of thoracic region
  • M45.5Ankylosing spondylitis of thoracolumbar region
  • M45.6Ankylosing spondylitis lumbar region
  • M45.7Ankylosing spondylitis of lumbosacral region
  • and 2 more national subcodes

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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