Frederick Greiner Barr, M.D.
Hematology & Oncology Physician · Chevy Chase, MD
Frederick Greiner Barr, M.D. is a hematology & oncology physician with a practice address in Chevy Chase, Maryland, and NPI 1184620122, issued on Jun 23, 2005. Check the license (Maryland D22775, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Frederick Greiner Barr
- Credential
- M.D.
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- D22775 MD
Self-reported in NPPES; status is on the state search - Practice location
- 5454 Wisconsin Ave, Chevy Chase, MD 20815
- Phone
- (301) 657-8587
- Enumerated
- Jun 23, 2005
- Record last updated
- Nov 23, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (301) 654-3958
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 317 in Maryland → Look up another NPI →
Also registered at 5454 Wisconsin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Edison Au, PTSpecialist1104922509
Verify Frederick Greiner Barr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D22775Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
629 Medicare Part D claims for 100 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. 29 claims were for opioids.
Most prescribed
- Anastrozole60 claims
- Jakafi48 claims
- Levothyroxine Sodium22 claims
- Revlimid21 claims
- Xarelto19 claims
- Diazepam18 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 89 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $4,017.73
157 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Frederick Greiner Barr among 317 hematology & oncology physician records in Maryland
Frederick Greiner Barr, 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. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2010 · 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.
All 317 in Maryland → Every provider in Chevy Chase → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Gregory Frykman, M.D.Bethesda, MD 208161154647683
- Zachariah Hamidi, MDBethesda, MD 208141225623929
- Arjun Kalra, MDBethesda, MD 208141538624861
- Ralph Boccia, M.D.Bethesda, MD 208171881663284
- Henry Chang, M.D.Bethesda, MD 208171760709489
- Shreya Desai, MDBethesda, MD 208171871157123
- Richard Pazdur, M.D.Bethesda, MD 208171619107596
- Chitra Rajagopal, MDBethesda, MD 208171467544312
Common questions
What is Frederick Greiner Barr, M.D.'s NPI number?
Frederick Greiner Barr, M.D.'s National Provider Identifier (NPI) is 1184620122, issued on Jun 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Frederick Greiner Barr, M.D. located?
The NPPES record lists a practice address at 5454 Wisconsin Ave, Chevy Chase, MD, 20815. Phone: (301) 657-8587. Providers update this record themselves, so call before visiting.
How can I verify Frederick Greiner Barr, M.D.'s license?
NPPES lists Maryland license number D22775, 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.
How much does Frederick Greiner Barr, M.D. prescribe under Medicare Part D?
In 2024, Frederick Greiner Barr, M.D. had 629 Medicare Part D claims for 100 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Frederick Greiner Barr, M.D.'s MIPS final score?
The 2023 MIPS final score is 89 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it 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.