First-Party vs Third-Party Data in Healthcare Marketing

The Assumption That Gets Healthcare Marketers in Trouble

"We only use first-party data" has become the default compliance talking point for healthcare marketing teams. When questioned about tracking practices, data collection, or advertising strategy, the response is almost reflexive: we collect our own data directly from our own website visitors. We do not buy third-party data lists. We are not doing anything risky.

This assumption is wrong in a way that matters enormously.

First-party data is not inherently safe. Third-party data is not inherently dangerous. The compliance risk in healthcare marketing is not determined by who collected the data. It is determined by how the data is collected, where it is processed, who can access it, and whether the patient consented to each step in the pipeline.

A hospital that collects first-party data through a Meta Pixel on its website is sending that data directly to Meta's servers. The data may be "first-party" in the sense that the hospital's website generated it, but it is being processed by a third party that has no BAA, no HIPAA obligation, and no reason to protect it. This is the exact pattern behind $193M+ in enforcement actions.

What "First-Party Data" Actually Means

In marketing, first-party data refers to information collected directly from your audience through your own channels. Website analytics, form submissions, email engagement, app usage, CRM records, call center logs. You collected it. You own the relationship with the individual. It is "yours."

Third-party data refers to information collected by an entity that has no direct relationship with the individual. Data brokers aggregate browsing behavior, purchase history, demographic information, and interest signals from across the internet and sell them to advertisers. When you buy a list of "people interested in orthopedic surgery" from a data broker, that is third-party data.

Second-party data sits in between: it is another organization's first-party data that they share with you directly. A health insurance company sharing member data with a hospital network for care coordination is an example.

These definitions are straightforward. The problem is that healthcare marketers use "first-party data" to describe data that is first-party in origin but third-party in processing.

The Collection vs Processing Distinction

Here is where the misconception creates real risk.

Your hospital website collects a pageview when a patient visits the "Bariatric Surgery" service line page. That is a first-party interaction. But if the pageview is captured by a Google Analytics tag, the data is processed on Google's servers. If a Meta Pixel fires on the same page, the data is processed on Meta's servers. If a Hotjar session replay script is running, the patient's entire browsing session is recorded and stored on Hotjar's infrastructure.

The data originated on your website. But it was immediately transmitted to third-party systems that you do not control, cannot audit, and that do not sign BAAs for marketing data. The "first-party" label obscures the reality: patient health information left your environment the moment the page loaded.

Advocate Aurora Health ($12.25M class action, 2024). Advocate Aurora installed Meta Pixel and Google Analytics on its website, app, and patient portal to "better understand patient needs." The tools exposed data of approximately 3 million patients to Meta and Google without consent, running from 2017 to 2022. Source

Advocate Aurora was collecting first-party data. Visitors were on Advocate Aurora's own website, using their own patient portal. The data was generated by direct interactions between patients and the health system. But because the collection mechanism was client-side tracking (Meta Pixel and Google Analytics), the "first-party" data was immediately shared with third parties. The first-party label provided zero protection.

Henry Ford Health ($12.2M class action, 2025). Henry Ford used Meta Pixel and Google tracking technologies on its website and MyChart patient portal between January 2020 and December 2023, impermissibly disclosing PHI to Meta and Google. Over 819,000 consumers were affected. Source

Henry Ford's case follows the identical pattern. First-party data collection. Third-party data processing. The result is a multimillion-dollar settlement.

Why the Third-Party Cookie Decline Does Not Solve This

The marketing industry's shift away from third-party cookies is often framed as a privacy win that makes first-party data more important than ever. Google's Privacy Sandbox, Apple's tracking restrictions, and the deprecation of third-party cookies are forcing marketers to rely on their own data.

Healthcare marketers hear this narrative and assume the problem is solving itself. Third-party cookies are going away, we rely on first-party data, so we are becoming more compliant by default.

This reasoning misses the point entirely.

Third-party cookies are one mechanism for tracking users across websites. Their decline does not eliminate the fundamental issue: client-side tracking scripts that send data from patient browsers to vendor servers. Google Analytics does not need third-party cookies to transmit pageview data to Google. Meta's Conversions API sends server-to-server data that never touches a cookie. The advertising ecosystem is adapting to cookie deprecation by finding other pathways for data collection, many of which are just as problematic for healthcare compliance.

The decline of third-party cookies changes the mechanism. It does not change the risk. A first-party cookie set by a Google Analytics script still sends data to Google. A server-to-server API call to Meta still shares conversion data with an advertising platform. The question remains: is the data being processed by a third party that has a BAA and HIPAA-compliant infrastructure?

What Truly First-Party Data Architecture Looks Like

For first-party data to be genuinely compliant in healthcare, the entire pipeline must be first-party: collection, processing, storage, and controlled downstream distribution.

First-party collection domains. Data collection endpoints should live on your domain, not on google-analytics.com or connect.facebook.net. Custom collection domains mean the patient's browser communicates only with your infrastructure. No requests leave the patient's device for third-party servers.

Server-set cookies. Cookies set by your server (not by JavaScript from a third-party domain) are truly first-party. They are immune to Safari's ITP restrictions, resistant to ad blockers, and controlled entirely by your infrastructure. The cookie values, lifetimes, and scopes are yours to define.

Server-side processing. Behavioral data collected on your infrastructure stays on your infrastructure until you make a deliberate decision to send specific data elements to specific destinations. You strip PHI before sending conversion signals to ad platforms. You verify consent before routing data to email tools. You maintain an auditable log of every downstream transmission.

BAA-covered vendors for any processing. When data does leave your infrastructure (for analytics dashboards, campaign optimization, email delivery), every recipient must be covered by a BAA that addresses the specific data they receive. The BAA must cover marketing data, not just clinical data.

This architecture makes "first-party data" more than a label. It makes it a structural reality.

Consent and the Future of First-Party Data

The regulatory landscape is moving toward explicit consent requirements for data collection and use, not just data sharing. Washington's My Health My Data Act, for example, requires consent before collecting health data, not just before sharing it with third parties.

This means that even truly first-party data collection (on your servers, on your domain, with no third-party involvement) may require patient consent. The first-party label does not exempt healthcare organizations from consent requirements.

Organizations that build consent-gated data flows, where data is only collected and processed after server-side consent verification, are positioned for this regulatory future. Those that assume first-party collection automatically equals compliant collection will face increasing friction as state laws expand and patient privacy expectations evolve.

A web scanner provides continuous visibility into your actual data collection practices. It identifies every script, cookie, and tracking technology on your site and flags which ones send data to third-party servers, regardless of whether the data originated as "first-party." This ongoing monitoring catches the gap between what your team thinks is happening and what is actually happening on every page.

FAQ

Is first-party data automatically HIPAA compliant?

No. First-party data that is collected through client-side tracking scripts (Google Analytics, Meta Pixel, Hotjar) is transmitted to third-party servers at the moment of collection. The "first-party" label refers to the data's origin, not its processing. HIPAA compliance depends on whether every entity that processes the data has a BAA and appropriate safeguards, regardless of who originally collected it.

Can healthcare organizations use third-party data for advertising?

Using third-party data (purchased audience lists, data broker segments) for healthcare advertising creates significant compliance risk. If the third-party data includes health information, using it for targeting likely violates HIPAA and potentially the FTC Health Breach Notification Rule. Even non-health third-party data used to target healthcare ads can create problems if the targeting itself reveals health interests when combined with the ad content.

Does Google's first-party mode in GA4 make it HIPAA compliant?

Google's first-party mode changes how cookies are set but does not change the fundamental architecture. Data still flows from the visitor's browser to Google's servers. Google does not sign BAAs for Google Analytics. First-party cookie mode is a privacy-law improvement, not a HIPAA compliance solution.

What is the difference between first-party data and first-party infrastructure?

First-party data describes who collected the data. First-party infrastructure describes where the data is processed. Healthcare compliance requires both: data collected directly from your audience and processed on infrastructure you control (or infrastructure covered by a BAA). Most "first-party data" strategies fail the infrastructure test because they use third-party tools to collect and process the data.

How do I know if my "first-party data" is actually being processed by third parties?

Audit your website's tracking technologies. Open your browser's developer tools and look at the network requests your site makes when a page loads. Every request to a domain you do not own (google-analytics.com, facebook.com, hotjar.com) represents data leaving your environment. A comprehensive web scanner automates this process across every page and alerts you when new third-party connections appear.

The label on your data matters less than the infrastructure it flows through. Ours Privacy provides truly first-party data collection, server-side processing, and compliant downstream distribution, making first-party data a structural reality rather than a marketing label.

Related reading:

• Client-Side vs Server-Side Analytics: The Healthcare Decision

• What Is Server-Side Tracking? A Guide for Healthcare Marketers

• First-Party Data Architecture for Healthcare Marketing

• HIPAA-Compliant Tools