Mark Kenton Buck, M.D.
Family Medicine Physician · Helena, MT
Mark Kenton Buck, M.D. is a family medicine physician with a practice address in Helena, Montana, and NPI 1801887815, issued on Oct 31, 2005. Check the license (Montana 8420, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Kenton Buck
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 8420 MT
Self-reported in NPPES; status is on the state search - Practice location
- 2960 N Washington St, Helena, MT 59602
- Phone
- (406) 389-2555
- Enumerated
- Oct 31, 2005
- Record last updated
- Oct 7, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (406) 443-2261
- Medicaid ID
- 000032368 MT
- Medicare enrollment
- Enrolled (PECOS I20040415001173); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 775 in Montana → Look up another NPI →
Also registered at 2960 N Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Jobes, PA-CPhysician Assistant1558600932
- Nathan Levanger, DOFamily Medicine Physician1356425946
- Emily Morrison, D.O.Emergency Medicine Physician1598177032
- Rebecca Nielson, RNRegistered Nurse1619829934
- Adeline Weidow, DNP, APRN, FNP-BCFamily Nurse Practitioner1578373346
Verify Mark Kenton Buck in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 8420Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average family medicine physician in 2024
309 Medicare Part D claims for 180 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass33 claims
- Cephalexin29 claims
- Amoxicillin28 claims
- Azithromycin28 claims
- Doxycycline Hyclate27 claims
- Prednisone20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Benefis Hospitals IncHelena, MT · Acute Care Hospitals2 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Mark Kenton Buck among 775 family medicine physician records in Montana
Mark Kenton Buck, M.D. is one of 775 family medicine physician records with a practice address in Montana. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1989 · median 2007 among the 464 with a school on file
- Record last updated2021 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 family medicine physician records list a practice address in Helena
They are 48 of the 1,591 NPPES records with a practice address in Helena, and 775 family medicine physician records in Montana.
All 775 in Montana → Every provider in Helena → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- William Batey, M.D.Helena, MT 596021477656288
- Earl Book, M.D.Helena, MT 596021265433700
- James Crichton, MDHelena, MT 596021700887692
- Emily Hedum, DOHelena, MT 596021144665795
- Kiley Kirksey, M.D.Helena, MT 596021083875629
- David Krainacker, MDHelena, MT 596021316948037
- Cathy Lay, MDHelena, MT 596021508952037
- Nathan Levanger, DOHelena, MT 596021356425946
Common questions
What is Mark Kenton Buck, M.D.'s NPI number?
Mark Kenton Buck, M.D.'s National Provider Identifier (NPI) is 1801887815, issued on Oct 31, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Kenton Buck, M.D. located?
The NPPES record lists a practice address at 2960 N Washington St, Helena, MT, 59602. Phone: (406) 389-2555. Providers update this record themselves, so call before visiting.
How can I verify Mark Kenton Buck, M.D.'s license?
NPPES lists Montana license number 8420, as entered by the provider. Search the Montana Board of Medical Examiners at https://ebiz.mt.gov/POL/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Kenton Buck, M.D. prescribe under Medicare Part D?
In 2024, Mark Kenton Buck, M.D. had 309 Medicare Part D claims for 180 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Mark Kenton Buck, M.D.'s MIPS final score?
The 2023 MIPS final score is 80.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.