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Statute of limitations — Illinois
Illinois imposes a 2-year statute of limitations for product liability claims (735 ILCS 5/13-213). The discovery rule applies — the clock starts when the plaintiff knew or should have known that Tepezza caused their hearing injury, not from the date of the last infusion. Illinois also has a statute of repose that generally bars claims filed more than 12 years after the first sale of the product.
2 years from discovery of Tepezza-related hearing injury
Filing venue
Where to File in Illinois
The Tepezza hearing loss MDL (No. 3079) is centralized in the U.S. District Court for the Northern District of Illinois before Judge Thomas M. Durkin. All federal Tepezza cases nationwide are transferred here for pretrial proceedings. Illinois state court cases may proceed separately in Cook County Circuit Court or other Illinois venues. The Northern District of Illinois is experienced with pharmaceutical mass tort litigation and has established efficient case management procedures for the Tepezza docket.
Illinois data
Exposure in Illinois
Estimated number of Americans diagnosed with thyroid eye disease (TED) annually — Illinois accounts for approximately 4% based on population share
~16,000
Source: American Thyroid Association
Total Tepezza hearing loss cases pending in the N.D. Illinois MDL as of January 2026
273
Source: JPML MDL Statistics
Percentage of Tepezza patients who experienced measurable audiometric changes in a prospective Endocrine Society study — far exceeding the 10% rate disclosed in clinical trials
65%
Source: American Journal of Ophthalmology (2022)
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