In 2024, 322 clinical laboratories billed Medicare for laboratory testing in California: 38,614,721 services and an estimated $1.6B in Medicare payments. Below: the top 5 by service volume, straight from CMS's public billing data.
Ranked by 2024 Medicare service volume across the family's codes.
| # | Provider | Specialty | City | Services | Est. Medicare paid |
|---|---|---|---|---|---|
| 1 | Unilab Corporation | Clinical Laboratory | West Hills | 7,761,695 | $95.8M |
| 2 | Laboratory Corporation Of America | Clinical Laboratory | San Diego | 5,873,896 | $66.7M |
| 3 | Unilab Corporation | Clinical Laboratory | Sacramento | 3,912,577 | $47.4M |
| 4 | Myonsite Diagnostic Lab | Clinical Laboratory | Rancho Santa Margarita | 1,506,998 | $1.7M |
| 5 | Scripps Health | Clinical Laboratory | San Diego | 864,161 | $10.5M |
The same 2024 Medicare data, sliced by city: the biggest laboratory testing cities by number of laboratories, in est.-Medicare-paid order.
In 2024 the top city for laboratory testing in California by est. Medicare paid was San Diego: 33 clinical laboratories billed 7,377,191 services for an estimated $265.2M, led by Laboratory Corporation Of America, with 5,873,896 services (est. $66.7M Medicare paid).
| # | City | Laboratories | Services | Est. Medicare paid | City leader (2024) |
|---|---|---|---|---|---|
| 1 | San Diego | 33 | 7,377,191 | $265.2M | Laboratory Corporation Of America · 5,873,896 services · est. $66.7M |
| 2 | Irvine | 15 | 893,400 | $56.0M | International Medical Laboratory · 626,643 services · est. $5.9M |
| 3 | North Hollywood | 11 | 706,454 | $24.3M | Lifeline Medical Laboratory Incorporated · 101,480 services · est. $5.0M |
| 4 | Burbank | 10 | 1,263,043 | $20.7M | Nbio Lab Inc · 319,921 services · est. $6.2M |
| 5 | Los Angeles | 14 | 611,885 | $11.5M | Abacus Business Corporation Group Inc. · 514,893 services · est. $5.1M |
City totals are cut from the same public CMS data as everything above: Medicare fee-for-service only, after CMS's under-11-beneficiary suppression, dollars always est. Medicare paid. Where a city shows fewer than 3 laboratories, we show the totals and name no one. Naming is capped by design: up to 5 ranked laboratories above plus at most one leader per city here, and no one else on this page.
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