NPPES file of Aug 9, 2026

Gideon Michael Blumenthal, M.D.

Hematology & Oncology Physician · Bethesda, MD

Gideon Michael Blumenthal, M.D. is a hematology & oncology physician with a practice address in Bethesda, Maryland, and NPI 1427242635, issued on Aug 30, 2007. Check the license (Maryland 937448, as entered in NPPES) on the Maryland Board of Physicians; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1427242635
Name
Gideon Michael Blumenthal
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
937448 MD
Self-reported in NPPES; status is on the state search
Practice location
8901 Wisconsin Ave, Bethesda, MD 20889
Phone
(301) 435-5868
Enumerated
Aug 30, 2007
Record last updated
Jun 27, 2008 (not updated in 18 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest hematology & oncology physician records → All 317 in Maryland → Look up another NPI →

Also registered at 8901 Wisconsin Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

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  5. Jennifer Ackerman Helfand, LCSW-CSocial Worker1912658659
  6. Barry Adams, M.S.S.W.Clinical Social Worker1033242730

Verify Gideon Michael Blumenthal in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMaryland Board of Physicians
    Search for license 937448    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Maryland license search

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Gideon Michael Blumenthal among 317 hematology & oncology physician records in Maryland

Gideon Michael Blumenthal, M.D. is one of 317 hematology & oncology physician records with a practice address in Maryland. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 42% of them.

  • NPI issued2007 · 42% of these records are older, 44% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 58% of these records are
  • Record last updated2008 · 57% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in Maryland

There are 317 hematology & oncology physician records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 317 in Maryland → Every provider in Bethesda → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. Wendy Bernstein, MDBethesda, MD 208891679548432
  2. Corey Carter, M.D.Bethesda, MD 208891831162833
  3. Alden Chiu, MDBethesda, MD 208891992894067
  4. James Driscoll, MDBethesda, MD 208891801081096
  5. J. Hamilton, M.D.Bethesda, MD 208891649386129
  6. Erin Larkins, MDBethesda, MD 208891386724532
  7. Dean Park, MDBethesda, MD 208891205983004
  8. Jeremy Perkins, M.D.Bethesda, MD 208891376573055

Common questions

What is Gideon Michael Blumenthal, M.D.'s NPI number?

Gideon Michael Blumenthal, M.D.'s National Provider Identifier (NPI) is 1427242635, issued on Aug 30, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gideon Michael Blumenthal, M.D. located?

The NPPES record lists a practice address at 8901 Wisconsin Ave, Bethesda, MD, 20889. Phone: (301) 435-5868. Providers update this record themselves, so call before visiting.

How can I verify Gideon Michael Blumenthal, M.D.'s license?

NPPES lists Maryland license number 937448, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

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

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.