2026 NPPES data Gynecology Physician NPI 1659350189 M.D.
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PIETER KETELAAR, M.D.

Gynecology Physician in BRICK, New Jersey. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
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

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

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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 reported

NPI registry status

Active

Issued 01/12/2006

NPI 1659350189

Primary specialty

Gynecology Physician

Niche

3,902 US NPIs in this specialty

Medicare Part D claims

42 86% vs specialty avg

2023 prescription claims

Specialty avg: 295

Specialty distribution in New Jersey

How Gynecology Physician compares to other specialties among New Jersey providers

New Jersey providers

Gynecology Physician share within New Jersey

1. Gynecology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Gynecology Physician share within New Jersey

Specialty board-certification context

Estimated specialty board-certified rate — Gynecology Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Gynecology Physician ABMS/AOA estimate

Est. board-certified rate (Gynecology Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Gynecology Physician) — ABMS / AOA estimate

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. is a Gynecology Physician provider practicing in BRICK, New Jersey, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1659350189. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

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. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what KETELAAR most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

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. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Gynecology Physician is a narrow specialty nationwide, with 3,902 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

1608 HIGHWAY 88
BRICK, NJ 08724

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%
Specialty average (est.)

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.

3,902
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.

Compare Gynecology Physician nationally: see state-by-state distribution →

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 3,902 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

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