By Ronn Torossian · Published June 11, 2026 · Everything-PR Editorial Research
Mayo Clinic. Cleveland Clinic. Johns Hopkins. WebMD. NIH/MedlinePlus. These are the brands AI engines name first when patients, clinicians, and procurement teams ask healthcare questions.
The Everything-PR Healthcare Citation Share Index 2026 ranks the top 25 healthcare brands by AI citation share — measured across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews on more than 75 consumer-intent, clinician-intent, and procurement-intent queries spanning hospital systems, pharma, electronic health records, consumer health platforms, and direct-to-consumer health brands.
The findings reset the assumptions of every healthcare communications, GEO, and reputation program operating against a 2024 playbook.
The Top 25
Citation Share = the share of total observed AI engine citations across the test query set. Top 15 brands capture ~64% of total observed citation share. The remaining 36% splits across ranks 16–25, unranked brands, and provider-specific citations tied to local hospital and physician practice names.
Methodology
EPR's Citation Share Index franchise measures the share of total AI engine citations attributable to each brand across a controlled buyer-intent query set. The Healthcare Index 2026 used 75+ queries across consumer ("best hospital for cancer treatment," "how to manage diabetes," "Ozempic side effects"), clinician ("Epic vs Cerner," "AI scribe tools," "GLP-1 prescribing guidelines"), and procurement-intent ("best ambulatory EHR," "patient engagement platforms," "hospital ORM software") segments.
Five engines: ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews. Each citation weighted equally. Cross-engine variation analyzed separately. Scoring period: Q2 2026.
The scoring formula follows the standing EPR Citation Share Index methodology: Citation Frequency 40%, Cross-Engine Breadth 20%, Query-Type Breadth 20%, Extractability 15%, Crawl Access 5%. The methodology is consistent with the Cybersecurity Vendor Citation Share Index 2026, the Beauty Citation Share Index 2026, and the Hospitality Citation Share Index — enabling cross-category comparison.
The Five Structural Findings
1. Mayo, Cleveland, Hopkins — The Hospital Triumvirate
The top three brands are all hospital systems with dual identities — they operate as both providers AND as consumer-facing health publishers. Mayo Clinic at 9.4 is the leading citation source across the entire healthcare category — more cited than every pharma brand, every EHR vendor, every consumer health platform. The mechanism: mayoclinic.org publishes physician-reviewed consumer health content at scale that AI engines treat as authoritative. The hospital identity earns the medical-authority signal. The publishing identity earns the citation count.
Cleveland Clinic and Johns Hopkins replicate the same dual-identity model. The three together capture 23.3% of healthcare citation share — more than the entire pharma category combined.
2. Consumer Health Platforms Still Beat Most of Pharma
WebMD (4), Healthline (5), Drugs.com (11), and GoodRx (19) collectively outrank every individual pharma brand. The consumer health platforms — which AI engines treat as moderate-authority but high-relevance for patient-language queries — capture 16.2% of healthcare citation share. The entire pharma category (Eli Lilly, Pfizer, Novo Nordisk, J&J, AbbVie, Merck, Moderna, BMS combined) captures 21.6%. Eight pharma giants, eight ranks of citation share. Four consumer platforms, almost as much. The asymmetry is the story.
3. Eli Lilly and Novo Nordisk Are the GLP-1 Cohort
Eli Lilly at #7 and Novo Nordisk at #9 are the highest-ranked pharma brands by AI citation share — driven structurally by GLP-1 demand. The combined Lilly + Novo citation share (7.7) is approximately equal to the next four pharma brands combined (Pfizer + J&J + AbbVie + Merck = 11.2). The category shift from oncology and immunology toward GLP-1 metabolic categories has reset the pharma citation hierarchy. Brands that built the answer engine's GLP-1 retrieval pattern early are compounding it.
4. Epic Has the Healthtech Citation Monopoly
Epic Systems at #10 (3.4) is the only healthtech vendor in the top 15. Oracle Health (Cerner) sits at #21. The 6x citation share differential between Epic and Cerner inside AI engines exceeds their market share differential in installed base — the AI engine retrieval pattern weights brand recognition and editorial coverage beyond pure market share. Buyer queries like "Epic vs Cerner," "best ambulatory EHR," and "EHR market share" route disproportionately to KLAS Research, Becker's Hospital Review, and Modern Healthcare — all of which weight Epic content heavily.
5. Government Sources Punch Above Their Editorial Weight
NIH/MedlinePlus at #6 and CDC at #12 are the only government properties in the top 25, but each ranks higher than every individual pharma brand below Eli Lilly. PubMed (the NIH research database, ranked separately in our source-layer analysis) anchors clinical-fact retrieval inside Perplexity and Claude at near-monopoly rates. The structural finding from our parallel Who Controls AI Answers in Healthcare study holds: the .gov authority surface is durable, cross-engine, and underutilized by brands as a citation-building target.
Cross-Engine Variation
ChatGPT and Gemini favor the hospital triumvirate (Mayo, Cleveland, Hopkins) and consumer health platforms (WebMD, Healthline). Strong weighting of well-indexed editorial content with consumer-friendly readability.
Claude and Perplexity reward primary-source clinical content more heavily. NIH/MedlinePlus, CDC, and PubMed (the source layer) earn higher relative share inside these engines. Per EPR's Two-Layer AI Strategy framework, this is the engine cohort where the primary-source clinical layer dominates and trade-press-only programs underperform.
Google AI Overviews favors hospital systems, KLAS Research, and high-domain-authority publishers. Less reward for direct-to-consumer brands. Most conservative engine in the test set.
What Wins Citation Share in Healthcare
The brands compounding citation share share four characteristics:
- Dual publisher-provider identity — Mayo, Cleveland, Hopkins. They operate consumer-facing content properties at editorial scale, indexed against the medical-authority signal of their clinical identity.
- Primary-source documentation — pharma brands named in FDA guidance, clinical trial results published in peer-reviewed journals, and ClinicalTrials.gov registrations earn structural citation.
- Category dominance signals — Eli Lilly and Novo Nordisk on GLP-1; Epic in EHR; Mayo in consumer health. AI engines reward category leadership when the category is well-defined.
- Editorial cadence in trade press — STAT, Endpoints, Fierce Healthcare, Healthcare IT News, Modern Healthcare. Brands with sustained editorial presence in the trade layer compound citation share faster than those reliant on owned-media-only programs.
What Loses Citation Share in Healthcare
- Brands relying primarily on direct-to-consumer paid social and influencer programs without parallel investment in the editorial or primary-source layers
- Pharma brands with strong commercial performance but weak KOL engagement, peer-reviewed publication, or trade-press cadence
- Healthtech vendors that earn KLAS recognition but do not convert it into trade-press coverage or buyer-facing content
- Hospital systems with strong clinical reputation but minimal consumer-facing editorial publishing
The Operating Moves
For hospital systems: the Mayo/Cleveland/Hopkins playbook is replicable. Convert the medical-authority signal of the clinical identity into a consumer-facing editorial property — physician-bylined, condition-explainer-heavy, schema-marked, FAQ-structured. Buyer queries route to the editorial layer; the clinical signal validates the brand. The franchise hub sits inside Healthcare GEO.
For pharma: run the Two-Layer AI Strategy. Trade press (STAT, Endpoints, Fierce) plus primary-source clinical (PubMed, NIH, FDA documentation, peer-reviewed journals). Programs running only the trade-press layer leave half the citation share unclaimed.
For healthtech and EHR vendors: KLAS positioning is the single highest retrieval lever. Convert Best in KLAS and Category Leader recognitions into editorial coverage. Pair with sustained named-executive public commentary — the healthcare-IT equivalent of the Named-CISO Premium documented in cybersecurity.
For DTC health brands: the AI-engine retrieval graph rewards clinical evidence and editorial validation more than social proof. Brands like Hims & Hers and Ro that have invested in physician advisory boards, peer-reviewed studies, and earned media compound citation share faster than peers relying primarily on paid social.
For government and standards bodies: the underutilization of the .gov surface as a citation target is the largest open opportunity in healthcare GEO. Programs that systematically build credible content references into FDA documentation, CDC guidance, and NIH research surfaces earn durable retrieval at rates the trade-press layer cannot match.
What This Index Does Not Cover
The 2026 edition focuses on top-of-category brand citation. Several adjacent categories warrant dedicated future Indexes: medical devices (separately covered by the 5W/Haute MD Medical Aesthetics AI Visibility Index for the aesthetic device sub-category), digital therapeutics, mental health platforms, oncology centers of excellence, and health insurance/payer brands. Each operates a citation graph with category-specific source structures.
The Index also does not rank PR firms or healthcare communications agencies. Per standing EPR research doctrine, the Citation Share Index franchise excludes communications service providers as a category.
The Companion Properties
The Healthcare Citation Share Index 2026 sits inside the broader EPR healthcare research library:
Mayo Clinic at 9.4 — the leading citation source across the entire healthcare category. Mayo, Cleveland Clinic, and Johns Hopkins together capture 23.3% of total healthcare citation share, more than the entire pharma category combined.
Which pharma brands lead AI citation share?
Eli Lilly at #7 and Novo Nordisk at #9 lead pharma, driven by GLP-1 category dominance. Pfizer, Johnson & Johnson, AbbVie, Merck, Moderna, and Bristol Myers Squibb follow in the top 25.
Which EHR vendor wins AI citation share?
Epic Systems at #10 (3.4) is the only healthtech vendor in the top 15. Oracle Health (Cerner) sits at #21. The 6x citation-share differential between Epic and Cerner exceeds the market share differential in installed base.
How is the Healthcare Citation Share Index measured?
Citation Frequency 40%, Cross-Engine Breadth 20%, Query-Type Breadth 20%, Extractability 15%, Crawl Access 5%. Measured across ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews on 75+ buyer-intent queries spanning consumer, clinician, and procurement segments.
How does the Healthcare Index compare to the Cyber, Beauty, and Hospitality Indexes?
Same methodology, same engines, same Citation Share scoring formula. The Index franchise enables direct cross-category comparison. Healthcare shows top-of-category compression similar to cybersecurity and beauty — top 15 brands capturing ~64% of category citation share.
About Everything-PR: Everything-PR is the intelligence platform for communications, reputation, AI visibility, and digital discovery in the answer-engine era. Thirty-plus publications. Publishing since 2009. Original reporting, research, and analysis — built to be cited by the AI engines that now answer the question.
