RxCheckUp
Anti-α4 integrin monoclonal antibody

Tysabri (natalizumab) Letter of Medical Necessity

Tysabri (natalizumab) carries PML risk and requires JCV antibody monitoring under the TOUCH program. PAs require comprehensive risk documentation.

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FDA-Approved Indications

  • ● relapsing forms of multiple sclerosis
  • ● Crohn's disease (TOUCH program)

Why Tysabri Prior Authorization Gets Denied

The most common denial reasons across major payers:

  1. 1. JCV antibody status not documented
  2. 2. TOUCH enrollment missing
  3. 3. Step therapy through other DMTs

What to Include in a Tysabri Letter of Medical Necessity

Document MS diagnosis, MRI findings, EDSS, prior DMTs and outcomes, JCV antibody status and index, TOUCH enrollment, and benefit-risk discussion.

Key clinical evidence to cite:

  • ✓ AFFIRM, SENTINEL trials

Relevant guidelines:

  • 📖 AAN MS Guidelines
  • 📖 NMSS Treatment Guidelines

Tysabri Prior Authorization Criteria

Standard criteria across major US payers for Tysabri. Specific criteria vary by plan — RxCheckUp tailors each LMN to your patient's exact payer policy.

Typical step therapy requirements:

  • → Step therapy through other DMTs

Required documentation:

  • ✓ ICD-10 diagnosis code with specificity
  • ✓ Prior therapy history with dates, doses, and discontinuation reasons
  • ✓ Specialist evaluation (where applicable)
  • ✓ Baseline disease activity or biomarker results
  • ✓ Clinical rationale citing FDA labeling or guidelines

Approval details:

Initial approval: typically 6 months. Renewal: 12 months with documented clinical response.

Payers Covering Tysabri

RxCheckUp tailors each LMN to the specific payer's medical policy and step therapy requirements:

UnitedHealthcareAetnaCignaBCBSMedicare Part B

Tysabri Prior Authorization FAQ

Why was my Tysabri prior authorization denied?

The most common denial reasons for Tysabri are: JCV antibody status not documented; TOUCH enrollment missing; Step therapy through other DMTs.

What should a Tysabri Letter of Medical Necessity include?

Document MS diagnosis, MRI findings, EDSS, prior DMTs and outcomes, JCV antibody status and index, TOUCH enrollment, and benefit-risk discussion.

Which payers cover Tysabri?

Tysabri is covered by major US payers including UnitedHealthcare, Aetna, Cigna, BCBS, Medicare Part B, though formulary tier and prior authorization criteria vary.

Prior Authorization Guides