NPI registry status
Active
2026 NPPES data Gynecology Physician NPI 1104903608 MD
Verify on CMS → Gill Alderfer, MD
Gynecology Physician in Ridley Park, Pennsylvania.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,912 in Gynecology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
50
Medicare Part D claims · Gynecology Physician avg: 319
Generic prescribing
74%
generic claims · 26% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Gill Alderfer, MD filed 50 Medicare Part D claims in 2024 as a Gynecology Physician in Ridley Park, Pennsylvania, prescribing 74% generic.
- 50
- Part D claims, 2024
- 74%
- generic prescribing
- ≥0th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Gill Alderfer, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1104903608), first enumerated 11/01/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 50 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
Pennsylvania statewide board action statistics are published annually — these figures describe aggregate state activity, not Gill Alderfer, MD's individual license status. Verify directly with the state medical board.
Source: PA-BOM annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1104903608 · Gynecology Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1104903608
- ENUM-LEGACY 2006
- TAX-NARROW 3,912
- RX-TRACE 50
- BOOK-THIN 167 in Pennsylvania
- PHOTO-ENUM Philip Schoenfeld · 2006
Gill Alderfer, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
50 ≥ 0th percentile 0% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
◑
Board-eligible specialty (heuristic, not verified)
Gill Alderfer, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Gill Alderfer, MD?
Quality data not reportedPrimary specialty
Gynecology Physician
Medicare Part D claims
50 84% vs specialty avg
Specialty distribution in Pennsylvania
How Gynecology Physician compares to other specialties among Pennsylvania providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Gynecology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1104903608 |
|---|---|
| Specialty | Gynecology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/01/2006 |
License & disciplinary context - Pennsylvania PA-BOM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~45K Pennsylvania medical licensees in 2023 - they are NOT specific to Gill Alderfer, MD. To verify Gill Alderfer, MD's current license status, search the PA-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
133
Total board actions, Pennsylvania 2023
Across 129 cases
2.96
Actions per 1,000 licensees
Pennsylvania statewide rate
probation
Most common action type
48 cases
PA-BOM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Pennsylvania disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Gill Alderfer, MD - brand share 26.0%
Gynecology Physician average
26% brand-name claims vs 74% generic, on 50 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
50
Total Claims
$24K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 142
- Total Day Supply
- 4,186
- Brand vs Generic
- 26% brand / 74% generic
- Brand Drug Cost
- $18K
- Generic Drug Cost
- $6K
Patient Demographics
- Average Patient Age
- 81.5 years
- Avg HCC Risk Score
- 0.75
Gynecology Physician Overview
How Gill Alderfer, MD fits within the Gynecology Physician landscape nationally.
3,912
Gynecology Physician Providers in US
53
States with Gynecology Physician
319
Avg Claims per Provider
Gill Alderfer, MD's 50 claims are below the specialty average of 319.
Nationwide Gynecology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Alderfer, both outside Pennsylvania so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gynecology Physician Providers in Pennsylvania
Other clinicians with the same primary specialty enrolled in Pennsylvania, drawn from the same CMS NPPES roster as Alderfer.
One of 167 Gynecology Physician providers enrolled in Pennsylvania, 5 are shown here.
Dr. Sharan Abdul-Rahman
MD, MBA
Philadelphia, PA
Dr. Alexi Achenbach
MD
Lebanon, PA
Dr. Donald Adams
M.D.
Lemoyne, PA
Dr. Taffy Anderson
MD
Hershey, PA
Dr. Eugene Andruczyk
D.O.
Philadelphia, PA
Compare Gynecology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gill Alderfer, MD's specialty? ▼
Gill Alderfer, MD specializes in Gynecology Physician and practices in Ridley Park, Pennsylvania. Credentials: MD.
How much does Gill Alderfer, MD prescribe under Medicare Part D? ▼
In 2024, Gill Alderfer, MD wrote 50 Medicare Part D claims totaling $24K in drug costs for N/A beneficiaries.
Where is Gill Alderfer, MD located? ▼
Gill Alderfer, MD is located at 100 E CHESTER PIKE, Ridley Park, PA, 19078. Phone: (610) 521-4311.
What is Gill Alderfer, MD's NPI number? ▼
Gill Alderfer, MD's National Provider Identifier (NPI) is 1104903608, issued on 11/01/2006.
Does Gill Alderfer, MD prescribe more brand-name or generic drugs? ▼
Gill Alderfer, MD's prescribing is 26% brand-name and 74% generic drugs by claim count, with $18K in brand drug costs.
How many Gynecology Physician providers are there in the US? ▼
There are 3,912 Gynecology Physician providers across 53 states in the US. The average Gynecology Physician provider writes 319 Medicare Part D claims per year.
Does Gill Alderfer, MD accept Medicare? ▼
Gill Alderfer, MD appears in CMS Medicare data with 50 Part D claims and N/A Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gill Alderfer, MD's credentials? ▼
Gill Alderfer, MD's NPI is 1104903608 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.