William Pfeffer, M.D.
NPI 1770589459 · Reproductive Endocrinology Physician · Bryn Mawr, PA
William Pfeffer, M.D. is a Reproductive Endocrinology Physician provider in Bryn Mawr, PA (NPI 1770589459).
Provider details
- NPI number
- 1770589459
- Entity type
- Individual
- Primary specialty
- Reproductive Endocrinology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD16837E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2005-06-27
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Pfeffer's NPI number?
- William Pfeffer's National Provider Identifier (NPI) is 1770589459, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Pfeffer's specialty?
- William Pfeffer is listed in the NPPES registry with a primary specialty of Reproductive Endocrinology Physician (Allopathic & Osteopathic Physicians).
- Where is William Pfeffer located?
- William Pfeffer's practice location on file with NPPES is 130 S Bryn Mawr Ave, Bryn Mawr, PA 19010-3121.
- What is William Pfeffer's phone number?
- The practice phone number listed in the NPPES registry for William Pfeffer is (610) 527-0800.
- Is William Pfeffer's NPI active?
- Yes — William Pfeffer's NPI (1770589459) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.