Seth Y. Flagg, MD
Family Medicine Physician · Upper Marlboro, MD
Seth Y. Flagg, MD is a family medicine physician with a practice address in Upper Marlboro, Maryland, and NPI 1548305451, issued on Feb 20, 2007. Check the license (Maryland 0082488, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Seth Y. Flagg
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 0082488 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1221 Mercantile LN, Upper Marlboro, MD 20774
- Phone
- (240) 672-3190
- Enumerated
- Feb 20, 2007
- Record last updated
- Jun 26, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110301000259); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,912 in Maryland → Look up another NPI →
Also registered at 1221 Mercantile LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Isabella Ahanogbe, M.D.Family Medicine Physician1821381849
- Folabomi Ajanaku, M.D.Gastroenterology Physician1851719777
- Jacqueline Arthur-Baidoo, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1235810276
- David Auh, MDFamily Medicine Physician1356752588
- Olufemi Balogun, MDFamily Medicine Physician1194010678
- Folasade Bangali, DPTPhysical Therapist1811394091
Verify Seth Y. Flagg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license 0082488Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average family medicine physician in 2024
2,268 Medicare Part D claims for 212 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 79 claims were for opioids.
Most prescribed
- Atorvastatin Calcium143 claims
- Pantoprazole Sodium112 claims
- Albuterol Sulfate Hfa84 claims
- Furosemide81 claims
- Gabapentin75 claims
- Amlodipine Besylate69 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.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The Mid Atlantic States, IncLargo, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Seth Y. Flagg among 1,912 family medicine physician records in Maryland
Seth Y. Flagg, MD is one of 1,912 family medicine physician records with a practice address in Maryland. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 42% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2006 · median 2004 among the 1,141 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 family medicine physician records list a practice address in Upper Marlboro
They are 22 of the 1,638 NPPES records with a practice address in Upper Marlboro, and 1,912 family medicine physician records in Maryland.
All 1,912 in Maryland → Every provider in Upper Marlboro → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Isabella Ahanogbe, M.D.Upper Marlboro, MD 207741821381849
- Olufemi Balogun, MDUpper Marlboro, MD 207741194010678
- Jericho De Mata, D.O.Upper Marlboro, MD 207741275950396
- Surendra Kumar, M.D.Largo, MD 207741073616652
- Papia Nasiri, M.D.Upper Marlboro, MD 207741912263534
- Uchemadu Nwaononiwu, M.DUpper Marlboro, MD 207741770710451
- Nwamaka Oluwato, M.D.Upper Marlboro, MD 207741649513904
- Ibukunolu Oni, MDUpper Marlboro, MD 207741609216894
Common questions
What is Seth Y. Flagg, MD's NPI number?
Seth Y. Flagg, MD's National Provider Identifier (NPI) is 1548305451, issued on Feb 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Seth Y. Flagg, MD located?
The NPPES record lists a practice address at 1221 Mercantile LN, Upper Marlboro, MD, 20774. Phone: (240) 672-3190. Providers update this record themselves, so call before visiting.
How can I verify Seth Y. Flagg, MD's license?
NPPES lists Maryland license number 0082488, 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 Seth Y. Flagg, MD prescribe under Medicare Part D?
In 2024, Seth Y. Flagg, MD had 2,268 Medicare Part D claims for 212 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.