Quick answers
- Where does Seth Y. Flagg see patients?
- Medicare's clinician data lists 1 practice location in Largo, MD. Call before your visit to confirm the address.
- What is Seth Y. Flagg's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Seth Y. Flagg accept Medicare assignment?
- Yes. Medicare's clinician data says Seth Y. Flagg accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Seth Y. Flagg offer telehealth?
- Medicare's clinician data says Seth Y. Flagg offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Seth Y. Flagg?
- (301) 618-5700, as listed in official Medicare / NPI Registry data.
- What is Seth Y. Flagg's NPI number?
- 1548305451. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Seth Y. Flagg is enrolled with Medicare (CMS data updated 2026-10-02).
- 1221 Mercantile LnLargo, MD 20774 (301) 618‑5700
Group practices
Medicare enrollment lists Seth Y. Flagg as a member of this group (CMS data updated 2026-10-02).
- Kaiser Foundation Health Plan of the Mid Atlantic States, Inc1,899 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Largo
Clinicians with the same Medicare primary specialty in Largo, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548305451 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians