NPI registry status
Active
2026 NPPES data Allergy Physician NPI 1639170871 MD
Verify on CMS → John Oppenheimer, MD
Allergy Physician in Cedar Knolls, 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 1,019 in Allergy 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
900
Medicare Part D claims · 209 beneficiaries · Allergy Physician avg: 755
Industry payments
$120.0K
133 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
John Oppenheimer, MD filed 900 Medicare Part D claims in 2023 as a Allergy Physician in Cedar Knolls, New Jersey.
- 900
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
John Oppenheimer, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
900 Top 25% higher than 75% 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 certification likely (heuristic, not verified)
John Oppenheimer, MD 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 John Oppenheimer, MD?
Quality data not reportedPrimary specialty
Allergy Physician
Medicare Part D claims
900 19% vs specialty avg
Specialty distribution in New Jersey
How Allergy 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 Allergy 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).
John Oppenheimer, MD appears in the CMS NPPES registry as a Allergy Physician provider holding MD credentials at 8 SADDLE RD, Cedar Knolls, NJ, 07927, with a listed phone of (908) 934-0555. NPI 1639170871 was issued on 08/10/2005.
Medicare Part D records for calendar year 2023 show 900 prescription claims written by this provider, covering 209 Medicare beneficiaries and totaling roughly $336K in drug spend.
Allergy Physician is a narrow specialty nationwide, with 1,019 enrolled providers across 49 states and an average of 755 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 | 1639170871 |
|---|---|
| Specialty | Allergy Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/10/2005 |
Hospital and facility affiliations
Facilities where John Oppenheimer, MD 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.
Jeffrey Weiss, M.D., P.A.
Morristown, 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 John Oppenheimer, MD. Source: openpaymentsdata.cms.gov.
Total received
$120.0K
Largest payer
GlaxoSmithKline, LLC.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
900
Total Claims
$336K
Total Drug Cost
209
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,649
- Total Day Supply
- 48,364
- Generic Drug Cost
- $21K
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 1.07
- Gender Split
- 66% female / 34% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Oppenheimer, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Fluticasone Propio…
Fluticasone Propionate
145 claims
- Montelukast Sodium
Montelukast Sodium
127 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
70 claims
- Ipratropium Bromide
Ipratropium Bromide
59 claims
- Trelegy Ellipta 55
Trelegy Ellipta
55 claims
- Breo Ellipta 52
Breo Ellipta
52 claims
- Azelastine Hcl 51
Azelastine Hcl
51 claims
- Epinephrine 39
Epinephrine
39 claims
| Drug | Claims |
|---|---|
| Fluticasone Propionate | 145 |
| Montelukast Sodium | 127 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 70 |
| Ipratropium Bromide | 59 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 55 |
| Breo Ellipta Fluticasone/Vilanterol | 52 |
| Azelastine Hcl | 51 |
| Epinephrine | 39 |
| Doxepin Hcl | 34 |
| Arnuity Ellipta Fluticasone Furoate | 32 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy Physician Overview
How John Oppenheimer, MD fits within the Allergy Physician landscape nationally.
1,019
Allergy Physician Providers in US
49
States with Allergy Physician
755
Avg Claims per Provider
John Oppenheimer, MD's 900 claims are above the specialty average of 755.
Nearby Allergy Physician Providers in New Jersey
Other clinicians with the same primary specialty enrolled in New Jersey, drawn from the same CMS NPPES roster as Oppenheimer.
Dr. Eric Applebaum
M.D.
Parsippany, NJ
Dr. Sandra Applebaum
M.D.
Parsippany, NJ
Dr. Thu Aung
M.D.
Brick, NJ
Dr. Eric Bantz
M.D.
Medford, NJ
Dr. Kenneth Better
M.D.
Linwood, NJ
Compare Allergy 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 Allergy 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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Frequently Asked Questions
What is John Oppenheimer, MD's specialty? ▼
John Oppenheimer, MD specializes in Allergy Physician and practices in Cedar Knolls, New Jersey. Credentials: MD.
How much does John Oppenheimer, MD prescribe under Medicare Part D? ▼
In 2023, John Oppenheimer, MD wrote 900 Medicare Part D claims totaling $336K in drug costs for 209 beneficiaries.
Where is John Oppenheimer, MD located? ▼
John Oppenheimer, MD is located at 8 SADDLE RD, Cedar Knolls, NJ, 07927. Phone: (908) 934-0555.
What is John Oppenheimer, MD's NPI number? ▼
John Oppenheimer, MD's National Provider Identifier (NPI) is 1639170871, issued on 08/10/2005.
How many Allergy Physician providers are there in the US? ▼
There are 1,019 Allergy Physician providers across 49 states in the US. The average Allergy Physician provider writes 755 Medicare Part D claims per year.
What drugs does John Oppenheimer, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Oppenheimer, MD's most frequently prescribed drugs include Fluticasone Propionate, Montelukast Sodium, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Oppenheimer, MD accept Medicare? ▼
John Oppenheimer, MD appears in CMS Medicare data with 900 Part D claims and 209 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Oppenheimer, MD's credentials? ▼
John Oppenheimer, MD's NPI is 1639170871 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.