IVIG for PANDAS: What Parents Need to Know in 2026
Intravenous immunoglobulin (IVIG) is one of the most discussed and hardest-to-access interventions in PANDAS care. Here is what it does, what the evidence shows, and how to navigate the insurance landscape.
What IVIG Is and Why It's Used
IVIG is a concentrated preparation of IgG antibodies pooled from thousands of donors. In PANDAS, it is used to address the autoantibodies believed to cross-react with brain tissue — potentially by diluting them, providing anti-idiotype antibodies, and modulating immune activity. The landmark 1999 Swedo study showed IVIG was significantly more effective than placebo in severe PANDAS. Subsequent studies have been more mixed; practice patterns vary by institution.
The Insurance Landscape in 2026
Most insurers classify IVIG for PANDAS as "investigational" and deny initial requests routinely. Virginia enacted legislation (HB1641) requiring health insurers to cover IVIG when prescribed for autoimmune conditions in pediatric patients meeting specified clinical criteria. Families outside Virginia are navigating a patchwork of coverage policies. Prior authorization is nearly universal.
Prior Authorization Documentation
Prior authorization typically requires: letter of medical necessity from the prescribing specialist, documentation of the PANDAS diagnosis and clinical course, evidence of prior treatment attempts and response, and objective evidence of functional impairment. Every one of these items is substantially easier to produce with a complete symptom history and treatment log.
Tracking IVIG Response
Many families report a brief symptom exacerbation in the days following infusion — this is well-documented and reflects immune activation. Improvement, when it occurs, often becomes apparent 2–4 weeks post-infusion. Daily symptom tracking through the infusion period gives you and your medical team the data to evaluate response and make treatment decisions.
PANDAS Tracker documents IVIG timelines and the symptom trajectory before, during, and after infusion. Free on iOS and Android.