NPI registry status
Active
2026 NPPES data Pediatric Hematology & Oncology Physician NPI 1659398329 MD
Verify on CMS → Nathan Kobrinsky, MD
Pediatric Hematology & Oncology Physician in Fargo, North Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 2,568 in Pediatric Hematology & Oncology 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
1K
Medicare Part D claims · 147 beneficiaries · Pediatric Hematology & Oncology Physician avg: 92
Generic prescribing
73%
generic claims · 26% 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
Nathan Kobrinsky, MD filed 1,315 Medicare Part D claims in 2023 as a Pediatric Hematology & Oncology Physician in Fargo, North Dakota, prescribing 73% generic.
- 1K
- Part D claims, 2023
- 73%
- 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.
Nathan Kobrinsky, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,315 Top 21% higher than 79% 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)
Nathan Kobrinsky, 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 Nathan Kobrinsky, MD?
Quality data not reportedPrimary specialty
Pediatric Hematology & Oncology Physician
Medicare Part D claims
1,315 14× vs specialty avg
Specialty distribution in North Dakota
How Pediatric Hematology & Oncology Physician compares to other specialties among North Dakota 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 Pediatric Hematology & Oncology 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).
Nathan Kobrinsky, MD appears in the CMS NPPES registry as a Pediatric Hematology & Oncology Physician provider holding MD credentials at 2101 ELM STREET N, Fargo, ND, 58102, with a listed phone of (701) 239-3700. NPI 1659398329 was issued on 07/17/2006.
Medicare Part D records for calendar year 2023 show 1,315 prescription claims written by this provider, covering 147 Medicare beneficiaries and totaling roughly $983K in drug spend, split 26% brand-name and 73% generic by claim count, with an opioid prescribing rate of 5.0%.
Pediatric Hematology & Oncology Physician is a narrow specialty nationwide, with 2,568 enrolled providers across 52 states and an average of 92 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 | 1659398329 |
|---|---|
| Specialty | Pediatric Hematology & Oncology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/17/2006 |
Brand vs generic prescribing mix · Above average
Nathan Kobrinsky, MD - brand share 26.0%
Pediatric Hematology & Oncology Physician average
26% brand-name claims vs 73% generic, on 1,315 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.
1,315
Total Claims
$983K
Total Drug Cost
147
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,856
- Total Day Supply
- 52,393
- Brand vs Generic
- 26% brand / 73% generic
- Brand Drug Cost
- $952K
- Generic Drug Cost
- $29K
- Opioid Claims
- 66 (5.0% rate)
- Antibiotic Claims
- 37
Patient Demographics
- Average Patient Age
- 66.7 years
- Avg HCC Risk Score
- 1.73
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 36, 65-74: 74, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nathan Kobrinsky, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
181 claims
- Amlodipine Besylate
Amlodipine Besylate
74 claims
- Xarelto 52
Xarelto
52 claims
- Celecoxib 48
Celecoxib
48 claims
- Rosuvastatin Calcium 45
Rosuvastatin Calcium
45 claims
- Hydrochlorothiazide 37
Hydrochlorothiazide
37 claims
- Hydrocodone-Acetam… 31
Hydrocodone-Acetaminophen
31 claims
- Prednisone 28
Prednisone
28 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 181 |
| Amlodipine Besylate | 74 |
| Xarelto Rivaroxaban | 52 |
| Celecoxib | 48 |
| Rosuvastatin Calcium | 45 |
| Hydrochlorothiazide | 37 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 31 |
| Prednisone | 28 |
| Atorvastatin Calcium | 26 |
| Clopidogrel Clopidogrel Bisulfate | 25 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pediatric Hematology & Oncology Physician in ND →
All providers in North Dakota →
Compare specialties →
Pediatric Hematology & Oncology Physician Overview
How Nathan Kobrinsky, MD fits within the Pediatric Hematology & Oncology Physician landscape nationally.
2,568
Pediatric Hematology & Oncology Physician Providers in US
52
States with Pediatric Hematology & Oncology Physician
92
Avg Claims per Provider
Nathan Kobrinsky, MD's 1,315 claims are above the specialty average of 92.
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 North Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Pediatric Hematology & Oncology 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore North Dakota
Frequently Asked Questions
What is Nathan Kobrinsky, MD's specialty? ▼
Nathan Kobrinsky, MD specializes in Pediatric Hematology & Oncology Physician and practices in Fargo, North Dakota. Credentials: MD.
How much does Nathan Kobrinsky, MD prescribe under Medicare Part D? ▼
In 2023, Nathan Kobrinsky, MD wrote 1,315 Medicare Part D claims totaling $983K in drug costs for 147 beneficiaries.
Where is Nathan Kobrinsky, MD located? ▼
Nathan Kobrinsky, MD is located at 2101 ELM STREET N, Fargo, ND, 58102. Phone: (701) 239-3700.
What is Nathan Kobrinsky, MD's NPI number? ▼
Nathan Kobrinsky, MD's National Provider Identifier (NPI) is 1659398329, issued on 07/17/2006.
Does Nathan Kobrinsky, MD prescribe more brand-name or generic drugs? ▼
Nathan Kobrinsky, MD's prescribing is 26% brand-name and 73% generic drugs by claim count, with $952K in brand drug costs.
Does Nathan Kobrinsky, MD prescribe opioids? ▼
Yes, Nathan Kobrinsky, MD had 66 opioid claims in 2023 with an opioid prescribing rate of 5.0%.
How many Pediatric Hematology & Oncology Physician providers are there in the US? ▼
There are 2,568 Pediatric Hematology & Oncology Physician providers across 52 states in the US. The average Pediatric Hematology & Oncology Physician provider writes 92 Medicare Part D claims per year.
What drugs does Nathan Kobrinsky, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Nathan Kobrinsky, MD's most frequently prescribed drugs include Eliquis, Amlodipine Besylate, Xarelto. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nathan Kobrinsky, MD accept Medicare? ▼
Nathan Kobrinsky, MD appears in CMS Medicare data with 1,315 Part D claims and 147 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nathan Kobrinsky, MD's credentials? ▼
Nathan Kobrinsky, MD's NPI is 1659398329 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 (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.