All ICD10 Codes

M45

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Ankylosing spondylitis

Use a more specific code (10 billable, 1 non-billable)
M45.0Ankylosing spondylitis of multiple sites in spineM45.1Ankylosing spondylitis of occipito-atlanto-axial regionM45.2Ankylosing spondylitis of cervical regionM45.3Ankylosing spondylitis of cervicothoracic regionM45.4Ankylosing spondylitis of thoracic regionM45.5Ankylosing spondylitis of thoracolumbar regionM45.6Ankylosing spondylitis lumbar regionM45.7Ankylosing spondylitis of lumbosacral regionM45.8Ankylosing spondylitis sacral and sacrococcygeal regionM45.9Ankylosing spondylitis of unspecified sites in spineM45.ANon-radiographic axial spondyloarthritishas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Includes
  • Rheumatoid arthritis of spine
Excludes1(Not coded here. Use a different code.)
  • arthropathy in Reiter's disease (M02.3-)
  • juvenile (ankylosing) spondylitis (M08.1)
Excludes2(Not included here. Code separately if applicable.)
  • Behçet's disease (M35.2)

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M45-M49Spondylopathies (M45-M49)
M45Ankylosing spondylitisNot billable
M45.0Ankylosing spondylitis of multiple sites in spineBillable
M45.1Ankylosing spondylitis of occipito-atlanto-axial regionBillable
M45.2Ankylosing spondylitis of cervical regionBillable
M45.3Ankylosing spondylitis of cervicothoracic regionBillable
M45.4Ankylosing spondylitis of thoracic regionBillable
M45.5Ankylosing spondylitis of thoracolumbar regionBillable
M45.6Ankylosing spondylitis lumbar regionBillable
M45.7Ankylosing spondylitis of lumbosacral regionBillable
M45.8Ankylosing spondylitis sacral and sacrococcygeal regionBillable
M45.9Ankylosing spondylitis of unspecified sites in spineBillable
M45.ANon-radiographic axial spondyloarthritisSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M45:

chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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