The Healthcare Citation Share Index 2026: Mayo Clinic Leads AI Answers
Mayo Clinic leads all healthcare brands in AI citation share at 9.4, ahead of Cleveland Clinic (7.1) and Johns Hopkins Medicine (6.8), according to Everything-PR’s Healthcare Citation Share Index 2026. The study scored 75+ queries across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews using a five-component formula weighted toward citation frequency (40%) and cross-engine breadth (20%). The top three hospital systems alone capture 23.3% of total healthcare citation share — more than the entire pharma category combined. Consumer health platforms like WebMD and Healthline also outrank every individual pharma brand, while Epic Systems holds a 6x citation lead over Oracle Health among EHR vendors.
For multi-site health systems and specialty groups, this confirms that owning both clinical authority and consumer-facing editorial content — not ad spend or network size — is what AI engines reward with citation share.
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Which healthcare brand has the highest AI citation share in 2026?
Mayo Clinic leads the category at a citation share of 9.4, according to Everything-PR’s Healthcare Citation Share Index 2026. Cleveland Clinic (7.1) and Johns Hopkins Medicine (6.8) follow, with the top three hospital systems together capturing 23.3% of total healthcare citation share — more than the entire pharma category combined.
How is healthcare AI citation share measured?
Everything-PR scores brands using a five-component formula: Citation Frequency (40%), Cross-Engine Breadth (20%), Query-Type Breadth (20%), Extractability (15%), and Crawl Access (5%), tested across more than 75 queries on ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews.
Which EHR vendor wins in AI search visibility?
Epic Systems ranks #10 overall with a citation share of 3.4, more than six times higher than Oracle Health (Cerner) at #21 with 1.5 — the widest gap of any vendor pairing in the index.