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M45Non-billableSave

M45 - Ankylosing spondylitis

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M45-M49 Spondylopathies (M45-M49) · Top-level category · FY2027

Coding Guidance

M45 is a non-billable heading. Report one of the 11 more specific codes below.

Applicable To

Inclusion terms listed under M45 in the ICD-10-CM tabular list.

  • Rheumatoid arthritis of spine

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom M45

Mutually exclusive: these conditions are never reported together with this code.

  • arthropathy in Reiter's disease (M02.3-)
  • juvenile (ankylosing) spondylitis (M08.1)
Excludes 2 — Not Included HereFrom M45

Not part of this code; report both codes when the patient has both conditions.

  • Behçet's disease (M35.2)
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • 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)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More Specific Codes (11)

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→M45.8Ankylosing spondylitis sacral and sacrococcygeal region→M45.9Ankylosing spondylitis of unspecified sites in spine→M45.ANon-radiographic axial spondyloarthritis→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M45.