NPPES file of Aug 9, 2026

Blood Banking & Transfusion Medicine Physician in Maryland

16 NPPES records list blood banking & transfusion medicine physician with a practice address in Maryland, 0.3 per 100,000 residents, the 7th highest rate of 41. Bethesda and Baltimore have the most; each record links to the provider's NPI and the Maryland license search.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207ZB0001X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Bethesda has the most, 9

  1. Bethesda9
  2. Baltimore4
  3. Rockville2
  4. Silver Spring1

Blood Banking & Transfusion Medicine Physician records in Maryland

  1. Harvey Alter, MDBethesda, MD 208921376847335
  2. Leonard Chen, M.D.Bethesda, MD 208921548688336
  3. Ion Chiosea, M.D.Bethesda, MD 208921811288947
  4. Kathleen Conry-Cantilena, M.D.Bethesda, MD 208921083041099
  5. David Daniel, MDBaltimore, MD 212641033563036
  6. Anne Eder, M.D.Rockville, MD 208551477810448
  7. Willy Flegel, MDBethesda, MD 208921093174369
  8. Linda Griffith, MD, PHDRockville, MD 208521649564857
  9. Salim Haddad, M.D.Silver Spring, MD 209931942758016
  10. Viviana JohnsonBethesda, MD 200891922195734
  11. James Long, M.D.Bethesda, MD 208891295147270
  12. Paul Ness, M.D.Baltimore, MD 212871548213309
  13. Clayton Simon, MDBethesda, MD 208891740240407
  14. James Sorace, MDBaltimore, MD 212441598978207
  15. Aaron Tobian, M.D., PH.D.Baltimore, MD 212871255481263
  16. Roya Zarpak, MD, MSBethesda, MD 208921083242937

Source: CMS NPPES, primary taxonomy 207ZB0001X: records by practice city and the list of records, file of Aug 9, 2026.

Maryland ranks 7 of 41 per resident

  1. Massachusetts0.4
  2. Rhode Island0.3
  3. Wisconsin0.3
  4. Maryland0.3
  5. Missouri0.2
  6. New York0.2
  7. 50 states and D.C.0.1

Source: CMS NPPES, primary taxonomy 207ZB0001X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

37.5% of these records appear in a Medicare file, against 53.7% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. Maryland37.5%
  2. United States53.7%

Blood Banking & Transfusion Medicine Physician records in Maryland, measured

  • In a Medicare file6 of 16 · 37.5% here, 53.7% nationally
  • In the CMS Doctors and Clinicians file4 · 25.0% here, 41.8% nationally
  • Not updated in five years or more10 · 62.5% here, 60.5% nationally

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207ZB0001X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

16 NPPES records list blood banking & transfusion medicine physician (207ZB0001X) as their primary taxonomy with a practice address in Maryland: 0.3 per 100,000 residents against 0.1 nationally (50 states and D.C.). Bethesda has 9 of them (56%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Wisconsin16
  2. Illinois15
  3. Missouri14
  4. Pennsylvania19

States with a similar rate per 100,000

  1. New York0.2
  2. Ohio0.2
  3. Arizona0.1
  4. Massachusetts0.4

The largest states

  1. California54
  2. New York44
  3. Massachusetts26
  4. Minnesota22
  5. Ohio22

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.