ICD-10-CM M45: Ankylosing spondylitis

ICD-10-CM Diagnosis Code (2025)

Official Description for M45

Ankylosing spondylitis

Coding Notes & Guidelines for M45

Excludes1: Not Coded Here
  • arthropathy in Reiter's disease (M02.3-)
  • juvenile (ankylosing) spondylitis (M08.1)
Excludes2: Not Included Here

Behçet's disease (M35.2)

Inclusion Terms

Rheumatoid arthritis of spine

Child Codes (More Specific Codes for M45):

M45.0 - Ankylosing spondylitis of multiple sites in spine M45.1 - Ankylosing spondylitis of occipito-atlanto-axial region M45.2 - Ankylosing spondylitis of cervical region M45.3 - Ankylosing spondylitis of cervicothoracic region M45.4 - Ankylosing spondylitis of thoracic region M45.5 - Ankylosing spondylitis of thoracolumbar region M45.6 - Ankylosing spondylitis lumbar region M45.7 - Ankylosing spondylitis of lumbosacral region M45.8 - Ankylosing spondylitis sacral and sacrococcygeal region M45.9 - Ankylosing spondylitis of unspecified sites in spine M45.A - Non-radiographic axial spondyloarthritis M45.A0 - Non-radiographic axial spondyloarthritis of unspecified sites in spine M45.A1 - Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region M45.A2 - Non-radiographic axial spondyloarthritis of cervical region M45.A3 - Non-radiographic axial spondyloarthritis of cervicothoracic region M45.A4 - Non-radiographic axial spondyloarthritis of thoracic region M45.A5 - Non-radiographic axial spondyloarthritis of thoracolumbar region M45.A6 - Non-radiographic axial spondyloarthritis of lumbar region M45.A7 - Non-radiographic axial spondyloarthritis of lumbosacral region M45.A8 - Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region M45.AB - Non-radiographic axial spondyloarthritis of multiple sites in spine

About ICD-10-CM Code M45 (Ankylosing spondylitis)

ICD-10-CM code M45 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM M45 became effective on October 1, 2024.

This page provides detailed information about M45 - Ankylosing spondylitis. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Ankylosing spondylitis.