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Hematology (Internal Medicine) Providers in the United States

Data updated monthly · Last refresh September 2026

1,474 Hematology (Internal Medicine) providers practice across all 50 states and Washington DC, and 51% received drug or device company payments in 2025. California has the most at 179. Listings are drawn from federal public records and are not endorsements.

1,474providers
39states
51%with industry payments

Industry payment share ranges from 65% in Ohio to 30% in Maryland, among states with 25 or more providers.

Hematology (Internal Medicine) providers by state

StateProvidersReceived payments
Hematology (Internal Medicine) in California17959%
Hematology (Internal Medicine) in New York16345%
Hematology (Internal Medicine) in Minnesota12737%
Hematology (Internal Medicine) in Massachusetts11945%
Hematology (Internal Medicine) in Ohio8965%
Hematology (Internal Medicine) in North Carolina7261%
Hematology (Internal Medicine) in Texas7261%
Hematology (Internal Medicine) in Florida6763%
Hematology (Internal Medicine) in Pennsylvania6648%
Hematology (Internal Medicine) in Michigan5746%
Hematology (Internal Medicine) in Illinois4846%
Hematology (Internal Medicine) in New Jersey3863%
Hematology (Internal Medicine) in Washington3450%
Hematology (Internal Medicine) in Maryland3330%
Hematology (Internal Medicine) in Oregon3155%
Hematology (Internal Medicine) in Georgia2654%
Hematology (Internal Medicine) in Tennessee23not reported
Hematology (Internal Medicine) in Missouri21not reported
Hematology (Internal Medicine) in Connecticut21not reported
Hematology (Internal Medicine) in Virginia21not reported
Hematology (Internal Medicine) in Wisconsin18not reported
Hematology (Internal Medicine) in Indiana16not reported
Hematology (Internal Medicine) in Kentucky13not reported
Hematology (Internal Medicine) in Utah11not reported
Hematology (Internal Medicine) in Iowa10not reported
Hematology (Internal Medicine) in Arizona10not reported
Hematology (Internal Medicine) in Kansas10not reported
Hematology (Internal Medicine) in Washington DC9not reported
Hematology (Internal Medicine) in South Carolina9not reported
Hematology (Internal Medicine) in Delaware8not reported
Hematology (Internal Medicine) in Colorado8not reported
Hematology (Internal Medicine) in New Hampshire7not reported
Hematology (Internal Medicine) in Mississippi7not reported
Hematology (Internal Medicine) in Maine6not reported
Hematology (Internal Medicine) in Arkansas6not reported
Hematology (Internal Medicine) in Vermont6not reported
Hematology (Internal Medicine) in Nebraska5not reported
Hematology (Internal Medicine) in West Virginia4not reported
Hematology (Internal Medicine) in Rhode Island4not reported

Common questions

How many Hematology (Internal Medicine) providers are there in the United States?

There are 1,474 Hematology (Internal Medicine) providers with active NPI records across all 50 states and Washington DC, according to federal NPPES data refreshed monthly. California has the most at 179.

What share of Hematology (Internal Medicine) providers received drug or device company payments?

757 of 1,474 Hematology (Internal Medicine) providers nationally (51%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program. The share is highest in Ohio at 65% and lowest in Maryland at 30%.

Where does this data come from?

Provider counts come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

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Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.