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Blood Banking & Transfusion Medicine Doctors in Maryland

Data updated monthly · Last refresh October 2026

16 Blood Banking & Transfusion Medicine providers practice in Maryland. The largest concentration is in Bethesda. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.

16providers

Bethesdatop city

Blood Banking & Transfusion Medicine by city in Maryland

Choose a city to see providers there.

Blood Banking & Transfusion Medicine in Bethesda	9 providers
Blood Banking & Transfusion Medicine in Baltimore	4 providers
Blood Banking & Transfusion Medicine in Rockville	2 providers
Blood Banking & Transfusion Medicine in Silver Spring	1 providers

Where Blood Banking & Transfusion Medicine Doctors in Maryland practice

From CMS Medicare enrollment records covering 2 of the 16 providers listed here (13%). Providers who do not bill Medicare are not included in these figures.

Largest practice groups

Group (as registered with Medicare)	Blood Banking & Transfusion Medicine Doctors	All clinicians in group	Main city
Johns Hopkins University	2	2,886	Baltimore

Hospitals where they hold privileges

Hospital	City	Ownership	CMS star rating	Blood Banking & Transfusion Medicine Doctors affiliated
Johns Hopkins Hospital, the	Baltimore	Nonprofit	5 of 5	2

Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.

Blood Banking & Transfusion Medicine providers in Maryland

Listed by city, largest first. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Aaron Tobian, M.D., PH.D.

Baltimore, MD · No drug or device payments recorded (2025) · (443) 287-0527

Dr. David Daniel, MD

Baltimore, MD · No drug or device payments recorded (2025) · (410) 502-2037

Dr. James Sorace, MD

Baltimore, MD · No drug or device payments recorded (2025) · (410) 786-2127

Dr. Paul Ness, M.D.

Baltimore, MD · No drug or device payments recorded (2025) · (410) 955-2660

Dr. Clayton Simon, MD

Bethesda, MD · No drug or device payments recorded (2025) · (301) 295-4000

Dr. Harvey Alter, MD

Bethesda, MD · No drug or device payments recorded (2025) · (301) 496-8393

Dr. Ion Chiosea, M.D.

Bethesda, MD · No drug or device payments recorded (2025) · (301) 451-8612

Dr. James Long, M.D.

Bethesda, MD · $116 in drug and device payments (2025) · (301) 295-4000

Dr. Kathleen Conry-cantilena, M.D.

Bethesda, MD · No drug or device payments recorded (2025) · (301) 496-4506

Dr. Leonard Chen, M.D.

Bethesda, MD · No drug or device payments recorded (2025) · (301) 451-8186

Dr. Roya Zarpak, MD, MS

Bethesda, MD · No drug or device payments recorded (2025) · (000) 000-0000

Dr. Viviana Johnson

Bethesda, MD · No drug or device payments recorded (2025) · (301) 319-4073

Dr. Willy Flegel, MD

Bethesda, MD · No drug or device payments recorded (2025) · (301) 594-7401

Dr. Anne Eder, M.D.

Rockville, MD · No drug or device payments recorded (2025) · (240) 314-3408

Dr. Linda Griffith, MD, PHD

Rockville, MD · No drug or device payments recorded (2025) · (301) 897-8037

Dr. Salim Haddad, M.D.

Silver Spring, MD · No drug or device payments recorded (2025) · (240) 402-9313

Common questions

How many Blood Banking & Transfusion Medicine providers are in Maryland?

There are 16 Blood Banking & Transfusion Medicine providers with active NPI records practicing in Maryland, according to federal NPPES data refreshed monthly.

Which cities in Maryland have the most Blood Banking & Transfusion Medicine providers?

Bethesda (9), Baltimore (4), Rockville (2) have the highest concentration of Blood Banking & Transfusion Medicine providers in Maryland.

Where does this data come from?

Provider counts and profiles 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.

Which hospitals do Blood Banking & Transfusion Medicine Doctors in Maryland work at?

According to CMS facility affiliation records, the Maryland hospitals where the most Blood Banking & Transfusion Medicine Doctors hold privileges are Johns Hopkins Hospital, the in Baltimore.