NPI registry status
Active
2026 NPPES data Medical Oncology Physician NPI 1043292246 MD
Verify on CMS → Peter Westervelt, MD
Medical Oncology Physician in Brunswick, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,815 in Medical 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 · 116 beneficiaries · Medical Oncology Physician avg: 689
MIPS score
79.3/100
▼ 4 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Peter Westervelt, MD reported a CMS MIPS final score of 79.3/100 - below the 83.1 national average - and filed 1,436 Medicare Part D claims in 2023.
- 79.3/100
- MIPS score · -4 vs avg
- 1K
- 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.
Peter Westervelt, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
79 30th percentile higher than 30% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Peter Westervelt, MD sits
This provider among medical oncology physician peers
Across the 1,527 medical oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Peter Westervelt, MD writes more Part D claims than 85% of them and scores higher on MIPS quality than 28% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one medical oncology physician peer from a representative sample of 60; the gold marker is Peter Westervelt, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Peter Westervelt, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - 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 Peter Westervelt, MD?
Near national averagePrimary specialty
Medical Oncology Physician
Medicare Part D claims
1,436 108% vs specialty avg
MIPS final score
79.3/100 3.8 pts vs avg
Specialty distribution in Maine
How Medical Oncology Physician compares to other specialties among Maine providers
Medicare quality performance, MIPS
Peter Westervelt, MD's 2023 MIPS final score plotted against the Medical Oncology Physician national average
- MIPS Final Score
- 79.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Medical Oncology Physician) - 79.3/100 vs national avg 83.1
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).
Peter Westervelt, MD appears in the CMS NPPES registry as a Medical Oncology Physician provider holding MD credentials at 329 MAINE ST, Brunswick, ME, 04011, with a listed phone of (207) 373-2266. NPI 1043292246 was issued on 11/15/2005.
Medicare Part D records for calendar year 2023 show 1,436 prescription claims written by this provider, covering 116 Medicare beneficiaries and totaling roughly $3.6 million in drug spend, with an opioid prescribing rate of 2.0%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 79.3/100 for the 2023 performance year (Quality 71.5, Cost 59.5), compared with the national average of 83.1.
Medical Oncology Physician is a narrow specialty nationwide, with 3,815 enrolled providers across 53 states and an average of 689 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 | 1043292246 |
|---|---|
| Specialty | Medical Oncology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/15/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.292
Final Score
Avg: 83.1
71.46
Quality
59.5132
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Peter Westervelt, 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.
Mainehealth
Brunswick, ME
Massachusetts General Physicians Organization Inc
Boston, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,436
Total Claims
$3.6M
Total Drug Cost
116
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,819
- Total Day Supply
- 50,744
- Generic Drug Cost
- $155K
- Opioid Claims
- 29 (2.0% rate)
- Antibiotic Claims
- 213
Patient Demographics
- Average Patient Age
- 72.2 years
- Avg HCC Risk Score
- 3.65
- Gender Split
- 44% female / 56% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Peter Westervelt, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Acyclovir
Acyclovir
143 claims
- Valacyclovir
Valacyclovir
128 claims
- Ciprofloxacin Hcl
Ciprofloxacin Hcl
90 claims
- Fluconazole
Fluconazole
83 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
77 claims
- Jakafi
Jakafi
60 claims
- Imatinib Mesylate 46
Imatinib Mesylate
46 claims
- Allopurinol 42
Allopurinol
42 claims
| Drug | Claims |
|---|---|
| Acyclovir | 143 |
| Valacyclovir Valacyclovir Hcl | 128 |
| Ciprofloxacin Hcl | 90 |
| Fluconazole | 83 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 77 |
| Jakafi Ruxolitinib Phosphate | 60 |
| Imatinib Mesylate | 46 |
| Allopurinol | 42 |
| Venclexta Venetoclax | 42 |
| Gabapentin | 35 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Oncology Physician Overview
How Peter Westervelt, MD fits within the Medical Oncology Physician landscape nationally.
3,815
Medical Oncology Physician Providers in US
53
States with Medical Oncology Physician
689
Avg Claims per Provider
Peter Westervelt, MD's 1,436 claims are above the specialty average of 689.
Nearby Medical Oncology Physician Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Westervelt.
Dr. Alan Boone
M.D.
Bangor, ME
Dr. Judit Gellen
M.D.
South Portland, ME
Dr. Ronald Hart
MD
Augusta, ME
Dr. Daniel Hayes
MD
Scarborough, ME
Dr. Andrew Hertler
MD
Augusta, ME
Compare Medical Oncology 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 Maine medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Medical 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.
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Frequently Asked Questions
What is Peter Westervelt, MD's specialty? ▼
Peter Westervelt, MD specializes in Medical Oncology Physician and practices in Brunswick, Maine. Credentials: MD.
How much does Peter Westervelt, MD prescribe under Medicare Part D? ▼
In 2023, Peter Westervelt, MD wrote 1,436 Medicare Part D claims totaling $3.6M in drug costs for 116 beneficiaries.
What is Peter Westervelt, MD's Medicare quality score? ▼
Peter Westervelt, MD has a CMS MIPS Final Score of 79.3/100 (Quality: 71.5, Cost: 59.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Peter Westervelt, MD located? ▼
Peter Westervelt, MD is located at 329 MAINE ST, Brunswick, ME, 04011. Phone: (207) 373-2266.
What is Peter Westervelt, MD's NPI number? ▼
Peter Westervelt, MD's National Provider Identifier (NPI) is 1043292246, issued on 11/15/2005.
Does Peter Westervelt, MD prescribe opioids? ▼
Yes, Peter Westervelt, MD had 29 opioid claims in 2023 with an opioid prescribing rate of 2.0%.
How many Medical Oncology Physician providers are there in the US? ▼
There are 3,815 Medical Oncology Physician providers across 53 states in the US. The average Medical Oncology Physician provider writes 689 Medicare Part D claims per year.
What drugs does Peter Westervelt, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Peter Westervelt, MD's most frequently prescribed drugs include Acyclovir, Valacyclovir, Ciprofloxacin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Peter Westervelt, MD accept Medicare? ▼
Peter Westervelt, MD appears in CMS Medicare data with 1,436 Part D claims and 116 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Peter Westervelt, MD's credentials? ▼
Peter Westervelt, MD's NPI is 1043292246 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.