NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1801887815 M.D.
Verify on CMS → Mark Buck, M.D.
Family Medicine Physician in Helena, Montana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,640 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
194
Medicare Part D claims · 128 beneficiaries · Family Medicine Physician avg: 3K
MIPS score
80.5/100
▼ 3 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Buck, M.D. reported a CMS MIPS final score of 80.5/100 - below the 83.1 national average - and filed 194 Medicare Part D claims in 2023.
- 80.5/100
- MIPS score · -3 vs avg
- 194
- 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.
Mark Buck, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
81 33rd percentile higher than 33% 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 Mark Buck, M.D. sits
This provider among family medicine physician peers
Across the 22,040 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Buck, M.D. writes more Part D claims than 11% of them and scores higher on MIPS quality than 32% - 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 family medicine physician peer from a representative sample of 60; the gold marker is Mark Buck, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Buck, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Mark Buck, M.D.?
Near national averagePrimary specialty
Family Medicine Physician
Medicare Part D claims
194 94% vs specialty avg
MIPS final score
80.5/100 2.6 pts vs avg
Specialty distribution in Montana
How Family Medicine Physician compares to other specialties among Montana providers
Medicare quality performance, MIPS
Mark Buck, M.D.'s 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 80.5/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Family Medicine Physician) - 80.5/100 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).
Mark Buck, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 2960 N WASHINGTON ST, Helena, MT, 59602, with a listed phone of (406) 389-2555. NPI 1801887815 was issued on 10/31/2005.
Medicare Part D records for calendar year 2023 show 194 prescription claims written by this provider, covering 128 Medicare beneficiaries and totaling roughly $2K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 80.5/100 for the 2023 performance year (Quality 93.1, Cost 62.6), compared with the national average of 83.1.
Family Medicine Physician is a high-volume specialty nationwide, with 147,640 enrolled providers across 56 states and an average of 3,418 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 | 1801887815 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/31/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
80.4662
Final Score
Avg: 83.1
93.1081
Quality
62.6125
Cost
75
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Buck, M.D. 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.
Benefis Hospitals Inc
★★☆☆☆ 2/5
Helena, MT
Acute Care Hospitals
CMS CCN: 270012
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.
194
Total Claims
$2K
Total Drug Cost
128
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 202
- Total Day Supply
- 2,240
- Generic Drug Cost
- $1K
- Antibiotic Claims
- 92
Patient Demographics
- Average Patient Age
- 69.9 years
- Avg HCC Risk Score
- 0.93
- Gender Split
- 69% female / 31% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Buck, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cephalexin
Cephalexin
26 claims
- Amoxicillin
Amoxicillin
18 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
15 claims
- Doxycycline Hyclate
Doxycycline Hyclate
15 claims
- Prednisone
Prednisone
15 claims
- Mupirocin
Mupirocin
11 claims
| Drug | Claims |
|---|---|
| Cephalexin | 26 |
| Amoxicillin | 18 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 15 |
| Doxycycline Hyclate | 15 |
| Prednisone | 15 |
| Mupirocin | 11 |
* 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 Mark Buck, M.D. fits within the Family Medicine Physician landscape nationally.
147,640
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Mark Buck, M.D.'s 194 claims are below the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Montana
Other clinicians with the same primary specialty enrolled in Montana, drawn from the same CMS NPPES roster as Buck.
Dr. Marc Adams
MD
Shelby, MT
Dr. Dale Agner
M.D.
Billings, MT
Dr. Cynthia Alarcon
PA-C
Helena, MT
Dr. Brandon Allen
MD
Ennis, MT
Dr. Hans Amen
D.O.
Malmstrom Afb, MT
Compare Family Medicine 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 Montana medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family Medicine 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
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Medical Specialties Explained
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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Mark Buck, M.D.'s specialty? ▼
Mark Buck, M.D. specializes in Family Medicine Physician and practices in Helena, Montana. Credentials: M.D..
How much does Mark Buck, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Buck, M.D. wrote 194 Medicare Part D claims totaling $2K in drug costs for 128 beneficiaries.
What is Mark Buck, M.D.'s Medicare quality score? ▼
Mark Buck, M.D. has a CMS MIPS Final Score of 80.5/100 (Quality: 93.1, Cost: 62.6). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Buck, M.D. located? ▼
Mark Buck, M.D. is located at 2960 N WASHINGTON ST, Helena, MT, 59602. Phone: (406) 389-2555.
What is Mark Buck, M.D.'s NPI number? ▼
Mark Buck, M.D.'s National Provider Identifier (NPI) is 1801887815, issued on 10/31/2005.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,640 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 Mark Buck, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Buck, M.D.'s most frequently prescribed drugs include Cephalexin, Amoxicillin, Amoxicillin-Clavulanate Potass. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Buck, M.D. accept Medicare? ▼
Mark Buck, M.D. appears in CMS Medicare data with 194 Part D claims and 128 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Buck, M.D.'s credentials? ▼
Mark Buck, M.D.'s NPI is 1801887815 with credentials M.D.. 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.