Zocdoc is a middleman for healthcare scheduling because it bundles four broken layers we still haven’t fixed: provider discovery, directory and insurance normalization, appointment inventory access, and conversion tooling.

It makes booking feel consumer-grade by aggregating high-intent patient demand and integrating (or syncing) into messy EHR scheduling so availability is actually bookable.

The business model follows the incentives: per-new-patient booking fees, sponsored placements, infrastructure/API products, and enterprise partnerships, which pushes the platform to optimize completed bookings more than clinical appropriateness.

Net: patients get speed and convenience, while physicians and health systems gain acquisition and backfill, but everyone risks more fragmentation and growing dependency on the marketplace toll.

I had to schedule a primary care appointment. Where did I go? Zocdoc.

I could have dug through a health system website for recommendations, but those interfaces feel archaic. A lot of systems now embed Zocdoc into their own sites to make scheduling easier, which made me ask the obvious question: is Zocdoc a middleman?

Zocdoc and similar companies are scheduling marketplaces. They exist because healthcare still behaves like a pre-internet consumer market: fragmented, full of unreliable directories, high-friction booking, and expensive demand generation for clinicians and health systems. Middlemen like Zocdoc showed up to bundle the inefficiencies around scheduling.

This includes:

But should a scheduling click require a venture-backed company to translate insurance networks, directory data, and EHR availability into something a patient can use?

Those four layers are what Zocdoc bundles and controls to make scheduling seamless for patients. Zocdoc is where patients book doctors. But it’s also where demand aggregation happens. Patients search by specialty, location, insurance, availability, and ratings. The platform captures high-intent traffic and routes it to bookable supply. When I searched for a PCP in my area, it surfaced a list of local physicians who accept my insurance, which is exactly what patients want.

But determining who is actually in-network is its own problem. I wrote about Ghost Networks several months ago. Insurers do not reliably update provider directories. A physician in Ohio can stay listed even after closing shop and moving to Texas. Patients end up trying to schedule with a ghost (spooky). Scheduling platforms can become a better source of truth for who is really in network. They answer the questions:

Then there’s appointment inventory access, which is the hard part. A directory is easy. A list of open slots is not. These marketplaces only feel magical when you can actually book—right now—without picking up the phone.

To pull that off, they need a bridge into the scheduling system. Either they integrate directly with an EHR’s calendar, or they build a sync layer that can read availability and write back confirmed appointments across a messy mix of scheduling tools. Zocdoc’s Sync framework is their bet on being that interoperability layer.

Once booking works, everything downstream becomes conversion: reminders, rescheduling, cancellation handling, and backfilling last-minute gaps. Waitlists fit here too. It’s the same hidden inventory problem—just packaged into a consumer-grade flow.

These platforms don’t fit a neat middleman sandwich. They sit on top of payers, directories, and EHR scheduling and translate the whole stack into a booking flow:

These scheduling marketplaces basically say, “We will translate this fragmented mess into a consumer-grade booking experience and charge providers for the privilege of access to our demand.” It’s a clean consumer experience. That’s the point. And that’s why it’s powerful. Once a platform owns discovery, it also controls ranking—and ranking becomes an ad product. At that moment, Zocdoc is selling demand with attribution—new patients you can measure. Scheduling turns into performance marketing, and the price drifts toward whatever a specialty can afford to pay per acquired patient.

These marketplaces show up when:

Zocdoc was a first mover in the space. They were founded in 2007 with the pitch that finding an in-network doctor with availability is painful. It still is, but it’s a little less painful now. The hardest parts for these marketplaces have been integration, distribution, and unit economics.

Once you solve booking at scale, the business becomes a toll on new-patient demand.

There are four ways scheduling marketplaces make money.

We can live without Zocdoc the company. We can’t live without what it does until payers, health systems, and EHRs make scheduling inventory truly interoperable and directories reliably accurate. This means addressing ghost networks and inadequate physician supply.

In summary, scheduling marketplaces exist because the system hasn’t earned the right to be self-serve. Until directories are accurate and appointment inventory is interoperable, this middleman stays valuable—and expensive.

Read more from The Middlemen Series here.