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Ankylosing Spondylitis

Affects approximately 0.2–0.5% of the U.S. population — roughly 600,000–1.6 million people·8 treatments

Ankylosing spondylitis (AS) is a chronic inflammatory disease that primarily affects the spine and sacroiliac joints, causing pain, stiffness, and progressive fusion of the vertebrae. It typically begins in early adulthood and can lead to a hunched-forward posture if untreated. AS is part of the broader category of axial spondyloarthritis.

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Standard step therapy requires failure of at least 2 NSAIDs (each for ≥2–4 weeks at maximum tolerated dose) before biologic therapy. Conventional DMARDs (methotrexate, sulfasalazine) are only appropriate for peripheral joint involvement — not axial disease. TNF inhibitors are the established first-line biologics, with IL-17 inhibitors (Cosentyx, Taltz) as alternatives.

Must fail at least 2 NSAIDs before biologic therapy

Very Common

HLA-B27 testing or imaging not submitted

Common

Conventional DMARD trial required (inappropriate for axial disease)

Common

Biosimilar preferred over brand biologic

Occasional

IL-17 inhibitor denied without TNF inhibitor failure

Occasional

  1. 1.Document failure of ≥2 NSAIDs with specific drugs, doses, duration, and reasons for failure
  2. 2.Include imaging: sacroiliac joint X-ray or MRI showing sacroiliitis
  3. 3.Document BASDAI or ASDAS disease activity scores
  4. 4.Emphasize that conventional DMARDs are NOT effective for axial disease — if insurer requires them, challenge with guidelines
  5. 5.Cite ACR/SAA/SPARTAN 2019 guidelines supporting biologic therapy after NSAID failure

Active clinical trials that may provide treatment at no cost.

Copay cards, patient assistance programs, and foundation grants for this condition's treatments.

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