NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1477085660 DO
Verify on CMS → James Kostek, DO
Family Medicine Physician in Summit, 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 147,760 in Family Medicine 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
2K
Medicare Part D claims · 139 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
78%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$64.66
4 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
James Kostek, DO filed 1,686 Medicare Part D claims in 2023 as a Family Medicine Physician in Summit, New Jersey, prescribing 78% generic.
- 2K
- Part D claims, 2023
- 78%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥82nd
- 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.
CMS NPPES provider registry desk
NPI 1477085660 · Family Medicine Physician
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1477085660
- ENUM-RECENT 2017
- TAX-MEGA 148K Family Medicine
- RX-MID 1,686
- BOOK-LIGHT 2,653 in New Jersey
- PHOTO-ENUM Rajaa Mourabet · 2017
James Kostek, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,686 ≥ 82nd percentile 82% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
James Kostek, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about James Kostek, DO?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
1,686 51% vs specialty avg
Specialty distribution in New Jersey
How Family Medicine 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 Family Medicine 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 | 1477085660 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 03/28/2017 |
Hospital and facility affiliations
Facilities where James Kostek, DO bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Rwjbh Primary Care Services
Somerville, NJ
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for James Kostek, DO. Source: openpaymentsdata.cms.gov.
Total received
$65
Largest payer
Gilead Sciences, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
James Kostek, DO - brand share 20.0%
Family Medicine Physician average
20% brand-name claims vs 78% generic, on 1,686 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.
1,686
Total Claims
$289K
Total Drug Cost
139
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,278
- Total Day Supply
- 95,329
- Brand vs Generic
- 20% brand / 78% generic
- Brand Drug Cost
- $258K
- Generic Drug Cost
- $29K
- Opioid Claims
- 18 (1.1% rate)
- Antibiotic Claims
- 23
Patient Demographics
- Average Patient Age
- 70.2 years
- Avg HCC Risk Score
- 1.26
- Gender Split
- 58% female / 42% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What James Kostek, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
164 claims
- Amlodipine Besylate
Amlodipine Besylate
95 claims
- Levothyroxine Sodium
Levothyroxine Sodium
72 claims
- Hydrochlorothiazide 60
Hydrochlorothiazide
60 claims
- Metformin Hcl 57
Metformin Hcl
57 claims
- Jardiance 49
Jardiance
49 claims
- Ozempic 49
Ozempic
49 claims
- Losartan Potassium 42
Losartan Potassium
42 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 164 |
| Amlodipine Besylate | 95 |
| Levothyroxine Sodium | 72 |
| Hydrochlorothiazide | 60 |
| Metformin Hcl | 57 |
| Jardiance Empagliflozin | 49 |
| Ozempic Semaglutide | 49 |
| Losartan Potassium | 42 |
| Gabapentin | 39 |
| Pantoprazole Sodium | 39 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How James Kostek, DO fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
James Kostek, DO's 1,686 claims are below the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Kostek, both outside New Jersey so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as Kostek.
One of 2,653 Family Medicine Physician providers enrolled in New Jersey, 5 are shown here.
Dr. Aleksandr Abakulov
DO
Morristown, NJ
Dr. Siu-Han Abate
MD
Freehold, NJ
Dr. Frishta Abawi
DO
Midland Park, NJ
Dr. Mai Abd Alqader
MD
Camden, NJ
Dr. Hend Abdelwahab
MD
Princeton, NJ
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is James Kostek, DO's specialty? ▼
James Kostek, DO specializes in Family Medicine Physician and practices in Summit, New Jersey. Credentials: DO.
How much does James Kostek, DO prescribe under Medicare Part D? ▼
In 2023, James Kostek, DO wrote 1,686 Medicare Part D claims totaling $289K in drug costs for 139 beneficiaries.
Where is James Kostek, DO located? ▼
James Kostek, DO is located at 99 BEAUVOIR AVE, Summit, NJ, 07901. Phone: (908) 522-2000.
What is James Kostek, DO's NPI number? ▼
James Kostek, DO's National Provider Identifier (NPI) is 1477085660, issued on 03/28/2017.
Does James Kostek, DO prescribe more brand-name or generic drugs? ▼
James Kostek, DO's prescribing is 20% brand-name and 78% generic drugs by claim count, with $258K in brand drug costs.
Does James Kostek, DO prescribe opioids? ▼
Yes, James Kostek, DO had 18 opioid claims in 2023 with an opioid prescribing rate of 1.1%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does James Kostek, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, James Kostek, DO's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does James Kostek, DO accept Medicare? ▼
James Kostek, DO appears in CMS Medicare data with 1,686 Part D claims and 139 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Kostek, DO's credentials? ▼
James Kostek, DO's NPI is 1477085660 with credentials DO. 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
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.