In 2024, 56 clinical laboratories billed Medicare for laboratory testing in Maryland: 4,583,340 services and an estimated $84.2M 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 | Quest Diagnostics Incorporated MD | Clinical Laboratory | Baltimore | 2,143,825 | $25.0M |
| 2 | Diamond Medical Laboratories, Llc. | Clinical Laboratory | Owings Mills | 444,430 | $3.3M |
| 3 | Capital Diagnostics LLC | Clinical Laboratory | Laurel | 351,156 | $1.3M |
| 4 | Cirrus Dx, Inc. | Clinical Laboratory | Rockville | 328,574 | $11.6M |
| 5 | Meritus Medical Laboratory LLC | Clinical Laboratory | Hagerstown | 274,089 | $3.2M |
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 Maryland by est. Medicare paid was Baltimore: 14 clinical laboratories billed 2,559,478 services for an estimated $32.5M, led by Quest Diagnostics Incorporated MD, with 2,143,825 services (est. $25.0M Medicare paid).
| # | City | Laboratories | Services | Est. Medicare paid | City leader (2024) |
|---|---|---|---|---|---|
| 1 | Baltimore | 14 | 2,559,478 | $32.5M | Quest Diagnostics Incorporated MD · 2,143,825 services · est. $25.0M |
| 2 | Rockville | 5 | 383,119 | $12.4M | Cirrus Dx, Inc. · 328,574 services · est. $11.6M |
| 3 | Gaithersburg | 3 | 9,563 | $3.9M | Genedx LLC · 5,649 services · est. $3.6M |
| 4 | Silver Spring | 2 | 56,635 | $3.6M | — |
| 5 | Frederick | 5 | 7,852 | $1.1M | Biogenics Medical Labs LLC · 2,968 services · est. $428K |
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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