NPI registry status
Active
2026 NPPES data Gynecology Physician NPI 1659350189 M.D.
Verify on CMS → Pieter Ketelaar, M.D.
Gynecology Physician in Brick, New Jersey.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,906 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
42
Medicare Part D claims · Gynecology Physician avg: 295
Generic prescribing
57%
generic claims · 43% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Pieter Ketelaar, M.D. filed 42 Medicare Part D claims in 2023 as a Gynecology Physician in Brick, New Jersey, prescribing 57% generic.
- 42
- Part D claims, 2023
- 57%
- generic prescribing
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.
Pieter Ketelaar, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
42 0th percentile higher than 0% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Pieter Ketelaar, M.D. 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 Pieter Ketelaar, M.D.?
Quality data not reportedPrimary specialty
Gynecology Physician
Medicare Part D claims
42 86% vs specialty avg
Specialty distribution in New Jersey
How Gynecology Physician compares to other specialties among New Jersey 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).
Pieter Ketelaar, M.D. appears in the CMS NPPES registry as a Gynecology Physician provider holding M.D. credentials at 1608 HIGHWAY 88, Brick, NJ, 08724, with a listed phone of (732) 458-7878. NPI 1659350189 was issued on 01/12/2006.
Medicare Part D records for calendar year 2023 show 42 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $11K in drug spend, split 43% brand-name and 57% generic by claim count.
Gynecology Physician is a narrow specialty nationwide, with 3,906 enrolled providers across 53 states and an average of 295 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1659350189 |
|---|---|
| Specialty | Gynecology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/12/2006 |
Brand vs generic prescribing mix · Above average
Pieter Ketelaar, M.D. - brand share 43.0%
Gynecology Physician average
43% brand-name claims vs 57% generic, on 42 2023 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 2023.
42
Total Claims
$11K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 77
- Total Day Supply
- 2,291
- Brand vs Generic
- 43% brand / 57% generic
- Brand Drug Cost
- $11K
- Generic Drug Cost
- $870
Patient Demographics
- Average Patient Age
- 80.0 years
- Avg HCC Risk Score
- 0.71
Gynecology Physician Overview
How Pieter Ketelaar, M.D. fits within the Gynecology Physician landscape nationally.
3,906
Gynecology Physician Providers in US
53
States with Gynecology Physician
295
Avg Claims per Provider
Pieter Ketelaar, M.D.'s 42 claims are below the specialty average of 295.
Nearby Gynecology Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as Ketelaar.
Dr. Lisa Abeshaus
M.D.
Summit, NJ
Dr. Richard Akawie
M.D.
East Brunswick, NJ
Dr. Joseph Alvaro
MD
Somerset, NJ
Dr. Jewel Naakarley Amui-Bellon
MD
Camden, NJ
Dr. Anthony Anzalone
M.D.
Clifton, NJ
Compare Gynecology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the New Jersey medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gynecology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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How insurance networks affect your costs
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Frequently Asked Questions
What is Pieter Ketelaar, M.D.'s specialty? ▼
Pieter Ketelaar, M.D. specializes in Gynecology Physician and practices in Brick, New Jersey. Credentials: M.D..
How much does Pieter Ketelaar, M.D. prescribe under Medicare Part D? ▼
In 2023, Pieter Ketelaar, M.D. wrote 42 Medicare Part D claims totaling $11K in drug costs for N/A beneficiaries.
Where is Pieter Ketelaar, M.D. located? ▼
Pieter Ketelaar, M.D. is located at 1608 HIGHWAY 88, Brick, NJ, 08724. Phone: (732) 458-7878.
What is Pieter Ketelaar, M.D.'s NPI number? ▼
Pieter Ketelaar, M.D.'s National Provider Identifier (NPI) is 1659350189, issued on 01/12/2006.
Does Pieter Ketelaar, M.D. prescribe more brand-name or generic drugs? ▼
Pieter Ketelaar, M.D.'s prescribing is 43% brand-name and 57% generic drugs by claim count, with $11K in brand drug costs.
How many Gynecology Physician providers are there in the US? ▼
There are 3,906 Gynecology Physician providers across 53 states in the US. The average Gynecology Physician provider writes 295 Medicare Part D claims per year.
Does Pieter Ketelaar, M.D. accept Medicare? ▼
Pieter Ketelaar, M.D. appears in CMS Medicare data with 42 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Pieter Ketelaar, M.D.'s credentials? ▼
Pieter Ketelaar, M.D.'s NPI is 1659350189 with credentials M.D.. 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.