Gill R. Alderfer, MD
Gynecology Physician · Ridley Park, PA
Gill R. Alderfer, MD is a gynecology physician with a practice address in Ridley Park, Pennsylvania, and NPI 1104903608, issued on Nov 1, 2006. Check the license (Pennsylvania MD016127E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Gill R. Alderfer
- Credential
- MD
- Primary taxonomy
- Gynecology Physician 207VG0400X
- License number
- MD016127E PA
Self-reported in NPPES; status is on the state search - Practice location
- 100 E Chester Pike, Ridley Park, PA 19078
- Phone
- (610) 521-4311
- Enumerated
- Nov 1, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (610) 521-5995
- Entity
- Type 1 · individual
8 nearest gynecology physician records → All 169 in Pennsylvania → Look up another NPI →
Also registered at 100 E Chester Pike
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachel Bernard, PA-CMedical Physician Assistant1578335469
- Andreea Cadar, M.D.Obstetrics & Gynecology Physician1689873135
- Kevin Connor, D.O.Internal Medicine Physician1821018953
- David Ginsburg, MDObstetrics & Gynecology Physician1922185420
- Timothy Gobrecht, PA-CPhysician Assistant1578964821
- Barry Holms, D.O.Internal Medicine Physician1346267507
Verify Gill R. Alderfer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD016127ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average gynecology physician in 2024
50 Medicare Part D claims, against an average of 299 among the 1,919 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of 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.
Gill R. Alderfer among 169 gynecology physician records in Pennsylvania
Gill R. Alderfer, MD is one of 169 gynecology physician records with a practice address in Pennsylvania. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 33% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileNo · 33% of these records are
- Record last updated2007 · 80% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VG0400X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gynecology Physician providers in Pennsylvania
There are 169 gynecology physician records in Pennsylvania.
All 169 in Pennsylvania → Every provider in Ridley Park → Gynecology Physician nationwide →
The 8 gynecology physician records with the nearest ZIP codes
- Katherine Chaves, MDNewtown Square, PA 190731104211077
- Jordan KlebanoffNewtown Square, PA 190731437578655
- Caroline Kwon, MDNewtown Square, PA 190731306405527
- Sherry Blumenthal, M.D.Willow Grove, PA 190901003809815
- Leslie Frankel, MDWillow Grove, PA 190901972579423
- Vivian Greenberg, M.D.Willow Grove, PA 190901689667487
- Frank Sandsorum, MDWillow Grove, PA 190901003882556
- David Toub, MDWyncote, PA 190951649528548
Common questions
What is Gill R. Alderfer, MD's NPI number?
Gill R. Alderfer, MD's National Provider Identifier (NPI) is 1104903608, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gill R. Alderfer, MD located?
The NPPES record lists a practice address at 100 E Chester Pike, Ridley Park, PA, 19078. Phone: (610) 521-4311. Providers update this record themselves, so call before visiting.
How can I verify Gill R. Alderfer, MD's license?
NPPES lists Pennsylvania license number MD016127E, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gill R. Alderfer, MD prescribe under Medicare Part D?
In 2024, Gill R. Alderfer, MD had 50 Medicare Part D claims; the average among gynecology physician prescribers was 299. 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.