Douglas Flagg, MD
Rheumatology Physician · South Euclid, OH
Douglas Flagg, MD is a rheumatology physician with a practice address in South Euclid, Ohio, and NPI 1821178013, issued on Oct 16, 2006. Check the license (Ohio 35-056239, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Douglas Flagg
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 35-056239 OH
Self-reported in NPPES; status is on the state search - Practice location
- 1611 S Green RD # 65, South Euclid, OH 44121
- Phone
- (216) 291-4050
- Enumerated
- Oct 16, 2006
- Record last updated
- Nov 16, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (216) 691-3524
- Medicaid ID
- 0818075 OH
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 289 in Ohio → Look up another NPI →
Verify Douglas Flagg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35-056239Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average rheumatology physician in 2024
14 Medicare Part D claims, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Douglas Flagg among 289 rheumatology physician records in Ohio
Douglas Flagg, MD is one of 289 rheumatology physician records with a practice address in Ohio. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 52% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2010 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Ohio
There are 289 rheumatology physician records in Ohio.
All 289 in Ohio → Every provider in South Euclid → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Lawrence Kent, M.D.South Euclid, OH 441211346284296
- Allen Segal, D.O.South Euclid, OH 441211497730220
- Frederic Bishko, M.D.Shaker Heights, OH 441221639317696
- David Blumenthal, MDBeachwood, OH 441221639243223
- Scott Burg, DOMayfield Hts, OH 441241093808123
- Robert Rzewnicki, MDCleveland, OH 441151831123256
- Giuseppe Antonelli, M.D.Parma, OH 441291912976473
- William Crowe, M.D.Parma, OH 441291154373975
Common questions
What is Douglas Flagg, MD's NPI number?
Douglas Flagg, MD's National Provider Identifier (NPI) is 1821178013, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Douglas Flagg, MD located?
The NPPES record lists a practice address at 1611 S Green RD # 65, South Euclid, OH, 44121. Phone: (216) 291-4050. Providers update this record themselves, so call before visiting.
How can I verify Douglas Flagg, MD's license?
NPPES lists Ohio license number 35-056239, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Douglas Flagg, MD prescribe under Medicare Part D?
In 2024, Douglas Flagg, MD had 14 Medicare Part D claims; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
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.