Seth Flagg, MD
NPI 1548305451 · Family Medicine Physician · Upper Marlboro, MD
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Seth Flagg, MD is a Family Medicine Physician provider in Upper Marlboro, MD (NPI 1548305451).
Provider details
- NPI number
- 1548305451
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0082488 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
60 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 34 | $188 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 26 | $142 |
Typical Medicare-allowed amounts for these services range $142–$188 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 60 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 143 | 55 |
| Pantoprazole Sodium | 112 | 33 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 84 | 33 |
| Furosemide | 81 | 29 |
| Gabapentin | 75 | 29 |
| Amlodipine Besylate | 69 | 25 |
| Metoprolol Tartrate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-20
- Last updated
- 2021-06-26
- Certified
- 2021-06-26
Frequently asked questions
- What is Seth Flagg's NPI number?
- Seth Flagg's National Provider Identifier (NPI) is 1548305451, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Seth Flagg's specialty?
- Seth Flagg is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Seth Flagg located?
- Seth Flagg's practice location on file with NPPES is 1221 Mercantile Ln, Upper Marlboro, MD 20774-5374.
- What is Seth Flagg's phone number?
- The practice phone number listed in the NPPES registry for Seth Flagg is (240) 672-3190.
- Does Seth Flagg accept Medicare?
- Seth Flagg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Seth Flagg's NPI active?
- Yes — Seth Flagg's NPI (1548305451) is active in the NPPES registry as of the last update on 2021-06-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.