Top billers · Surgical Pathology · Washington, D.C.

Who bills surgical pathology in Washington, D.C.?

In 2024, 48 providers billed Medicare for surgical pathology, special stains, and immunohistochemistry in Washington, D.C.: 69,654 services and an estimated $2.2M in Medicare payments. Below: the top 5 by service volume, straight from CMS's public billing data.

The list

The top 5 surgical pathology billers in Washington, D.C..

Ranked by 2024 Medicare service volume across the family's codes.

#	Provider	Specialty	City	Services	Est. Medicare paid
1	Joseph Zahn, M.D.	Dermatology	Washington	10,235	$322K
2	Catharine Kauffman, M.D.	Pathology	Washington	4,829	$149K
3	William Winecoff, M.D.	Pathology	Washington	4,155	$227K
4	Peter Derosa, M.D.	Pathology	Washington, Dc	3,192	$77K
5	Jeffrey Tefft, M.D.	Pathology	Nw Washington	3,113	$84K

That's the top 5. 43 more providers billed surgical pathology in Washington, D.C. in 2024. The full ranked list, with year-over-year history, group affiliations, and phone numbers, is one search in Prospect 811.

See the full list →

The breakdown

What's behind the number.

Top codes in Washington, D.C.

88305Pathology examination of tissue using a microscope, intermediate complexity35,207

88341Special stained specimen slides to examine tissue, each additional procedure14,342

88342Special stained specimen slides to examine tissue, initial procedure8,592

88307Pathology examination of tissue using a microscope, moderately high complexity4,231

88313Special stained specimen slides to examine tissue including interpretation and report3,739

88312Special stained specimen slides to identify organisms including interpretation and report1,796

Top specialties billing it

Pathology45 providers

Dermatology2 providers

Gastroenterology1 providers

Where the billers are

Washington46 providers

Nw Washington1 providers

Washington, Dc1 providers

City breakdown

The top surgical pathology cities in Washington, D.C.

The same 2024 Medicare data, sliced by city: the biggest surgical pathology cities by number of billers, in est.-Medicare-paid order.

In 2024 the top city for surgical pathology in Washington, D.C. by est. Medicare paid was Washington: 46 providers billed 63,349 services for an estimated $2.0M, led by Joseph Zahn, M.D., with 10,235 services (est. $322K Medicare paid).

#	City	Billers	Services	Est. Medicare paid	City leader (2024)
1	Washington	46	63,349	$2.0M	Joseph Zahn, M.D. · 10,235 services · est. $322K
2	Nw Washington	1	3,113	$84K	—
3	Washington, Dc	1	3,192	$77K	—

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 billers, we show the totals and name no one. Naming is capped by design: up to 5 ranked billers above plus at most one leader per city here, and no one else on this page.

Where these numbers come from. Everything on this page is computed from CMS's public Medicare Provider Utilization & Payment data for 2024, the most recent year CMS has released. It covers traditional Medicare fee-for-service only (no commercial insurance, no Medicare Advantage). CMS suppresses any provider-and-code line with fewer than 11 beneficiaries before publishing, so low-volume billers don't appear at all. "Est. Medicare paid" is each billing line's average Medicare payment multiplied by its service count, summed. One service is one specimen exam or stain as billed to Medicare. Prospect 811 organizes public data; it doesn't add to or alter it. Not affiliated with or endorsed by CMS. Full detail on the data page.

This is one code family, one state, one year.

Prospect 811 searches all 535 million Medicare billing records on any code you sell, maps your exact territory, and hands you the phone numbers. $79/month, no contract, 14-day refund.

Start prospecting →