NPI registry status
Active
2026 NPPES data Medical Oncology Physician NPI 1114157195 DO
Verify on CMS → Dennis Buck, DO
Medical Oncology Physician in Show Low, Arizona.
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
159
Medicare Part D claims · 48 beneficiaries · Medical Oncology Physician avg: 689
Generic prescribing
68%
generic claims · 32% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
85.4/100
▲ 2 pts above national avg 83.1 · Above neutral
Industry payments
$170.7
3 payments · CMS Open Payments (Sunshine Act)
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
Dennis Buck, DO reported a CMS MIPS final score of 85.4/100 - above the 83.1 national average - and filed 159 Medicare Part D claims in 2023.
- 85.4/100
- MIPS score · +2 vs avg
- 159
- Part D claims, 2023
- 68%
- generic prescribing
- 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.
Dennis Buck, DO's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
85 49th percentile higher than 49% 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 Dennis Buck, DO 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, Dennis Buck, DO writes more Part D claims than 21% of them and scores higher on MIPS quality than 47% - placing this provider in the lower-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 Dennis Buck, DO. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Dennis Buck, DO 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 Dennis Buck, DO?
High performer (top quartile)Primary specialty
Medical Oncology Physician
Medicare Part D claims
159 77% vs specialty avg
MIPS final score
85.4/100 2.3 pts vs avg
Specialty distribution in Arizona
How Medical Oncology Physician compares to other specialties among Arizona providers
Medicare quality performance, MIPS
Dennis Buck, DO's 2023 MIPS final score plotted against the Medical Oncology Physician national average
- MIPS Final Score
- 85.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Medical Oncology Physician) - 85.4/100 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).
Dennis Buck, DO appears in the CMS NPPES registry as a Medical Oncology Physician provider holding DO credentials at 2500 E HUNT DR STE H-J, Show Low, AZ, 85901, with a listed phone of (928) 537-6937. NPI 1114157195 was issued on 07/23/2009.
Medicare Part D records for calendar year 2023 show 159 prescription claims written by this provider, covering 48 Medicare beneficiaries and totaling roughly $420K in drug spend, split 32% brand-name and 68% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 85.4/100 for the 2023 performance year (Quality 74), 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 | 1114157195 |
|---|---|
| Specialty | Medical Oncology Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 07/23/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
85.4075
Final Score
Avg: 83.1
74.0136
Quality
99
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Dennis Buck, 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.
Carris Health LLC
Willmar, MN
Summit Healthcare Association
Show Low, AZ
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 Dennis Buck, DO. Source: openpaymentsdata.cms.gov.
Total received
$171
Largest payer
ABBVIE 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 · Above average
Dennis Buck, DO - brand share 32.0%
Medical Oncology Physician average
32% brand-name claims vs 68% generic, on 159 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.
159
Total Claims
$420K
Total Drug Cost
48
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 252
- Total Day Supply
- 7,082
- Brand vs Generic
- 32% brand / 68% generic
- Brand Drug Cost
- $414K
- Generic Drug Cost
- $6K
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 1.75
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Dennis Buck, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
26 claims
- Anastrozole
Anastrozole
17 claims
- Erleada
Erleada
12 claims
- Tamoxifen Citrate
Tamoxifen Citrate
11 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 26 |
| Anastrozole | 17 |
| Erleada Apalutamide | 12 |
| Tamoxifen Citrate | 11 |
* 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 Dennis Buck, DO 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
Dennis Buck, DO's 159 claims are below the specialty average of 689.
Nearby Medical Oncology Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Buck.
Dr. Rishi Agarwal
M.D.
Scottsdale, AZ
Dr. Waqas Arslan
M.D.
Phoenix, AZ
Dr. Amir Azadi
M.D.
Scottsdale, AZ
Dr. Puneet Bhalla
M.D.
Chandler, AZ
Dr. John Bibb
MD
Scottsdale, AZ
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 Arizona 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 Dennis Buck, DO's specialty? ▼
Dennis Buck, DO specializes in Medical Oncology Physician and practices in Show Low, Arizona. Credentials: DO.
How much does Dennis Buck, DO prescribe under Medicare Part D? ▼
In 2023, Dennis Buck, DO wrote 159 Medicare Part D claims totaling $420K in drug costs for 48 beneficiaries.
What is Dennis Buck, DO's Medicare quality score? ▼
Dennis Buck, DO has a CMS MIPS Final Score of 85.4/100 (Quality: 74). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Dennis Buck, DO located? ▼
Dennis Buck, DO is located at 2500 E HUNT DR STE H-J, Show Low, AZ, 85901. Phone: (928) 537-6937.
What is Dennis Buck, DO's NPI number? ▼
Dennis Buck, DO's National Provider Identifier (NPI) is 1114157195, issued on 07/23/2009.
Does Dennis Buck, DO prescribe more brand-name or generic drugs? ▼
Dennis Buck, DO's prescribing is 32% brand-name and 68% generic drugs by claim count, with $414K in brand drug costs.
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 Dennis Buck, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Dennis Buck, DO's most frequently prescribed drugs include Eliquis, Anastrozole, Erleada. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Dennis Buck, DO accept Medicare? ▼
Dennis Buck, DO appears in CMS Medicare data with 159 Part D claims and 48 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Dennis Buck, DO's credentials? ▼
Dennis Buck, DO's NPI is 1114157195 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.
- 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.