David Seifer, M.D.
NPI 1336252659 · Reproductive Endocrinology Physician · Westport, CT
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Seifer, M.D. is a Reproductive Endocrinology Physician provider in Westport, CT (NPI 1336252659).
Provider details
- NPI number
- 1336252659
- Entity type
- Individual
- Primary specialty
- Reproductive Endocrinology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 169526 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-17
- Last updated
- 2022-07-21
Frequently asked questions
- What is David Seifer's NPI number?
- David Seifer's National Provider Identifier (NPI) is 1336252659, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Seifer's specialty?
- David Seifer is listed in the NPPES registry with a primary specialty of Reproductive Endocrinology Physician (Allopathic & Osteopathic Physicians).
- Where is David Seifer located?
- David Seifer's practice location on file with NPPES is 125a Kings Highway N, Westport, CT 06880.
- What is David Seifer's phone number?
- The practice phone number listed in the NPPES registry for David Seifer is (203) 341-8899.
- Does David Seifer accept Medicare?
- David Seifer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Seifer's NPI active?
- Yes — David Seifer's NPI (1336252659) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.