Who Bills for the Most Patients?
Some Medicaid providers bill for hundreds of thousands — even millions — of beneficiaries. These aren't individual doctors. They're pharmacy benefit managers, transportation brokers, and managed care organizations processing claims at massive scale. Individual physicians typically see only a few hundred patients.
108.2M
Top bene count
$47.88B
Combined spending
1.1
Median claims / bene
100
1M+ beneficiaries
The Medicaid billing data reveals an enormous range in how many patients a single provider serves. At the top of the list, the largest provider billed for over 108.2M beneficiaries — more than the population of most countries. These aren't medical practices in the traditional sense. They're large organizations that process claims on behalf of networks of individual providers.
The #1 provider: 108.2M beneficiaries
Unilab Corporation in West Hills, CA processed 111.6M claims totaling $668.5M. With 708 different procedure codes, this is clearly a large organizational biller — not an individual practitioner.
The most common state among the top 100 is California (11 providers). Large states with major Medicaid populations — California, New York, Texas, Florida — dominate the list, reflecting both population size and the scope of their Medicaid programs.
Scale vs. individual care
100 providers serve over 1 million beneficiaries each. Most have a claims-per-beneficiary ratio near 1.0–1.2, suggesting they process standardized, high-volume transactions. By contrast, providers with ratios above 5.0 are likely providing ongoing care to smaller populations — 2 providers in this list have a ratio of 5.0+.
The combined spending of the top 100 providers by beneficiary count is $47.88B. The largest single biller by spending in this group processed $7.18B.
Context: Organizational vs. individual providers
High beneficiary counts don't indicate fraud — they indicate organizational scale. Pharmacy benefit managers, managed care organizations, and transportation brokers legitimately process millions of claims. The interesting anomalies are providers with both high beneficiary counts and unusual spending patterns or claims-per-beneficiary ratios.
Top 20 Providers by Beneficiary Count
All 100 Providers by Beneficiary Count
Key Takeaways
- ▸The top provider bills for 108.2M beneficiaries — organizational-scale billing, not individual practice.
- ▸The median claims-per-beneficiary ratio is 1.1 — most top providers process standardized, high-volume transactions.
- ▸100 providers each serve over 1 million beneficiaries, combining for $47.88B in total spending.
- ▸The most common state is California (11 providers) among the top 100.
Source: HHS Medicaid Provider Spending Data (2018–2024) · 227M records