Mark Buck, M.D.
NPI 1801887815 · Family Medicine Physician · Helena, MT
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Buck, M.D. is a Family Medicine Physician provider in Helena, MT (NPI 1801887815).
Provider details
- NPI number
- 1801887815
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 8420 (MT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
542 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 88 | $125 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 54 | $7 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 53 | $10 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 50 | $88 |
| Amplifed Dna Or Rna Probe Detection of Severe Acute Respiratory Syndrome Coronavirus 2 (covid-19) Antigen87635 | 38 | $49 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 33 | 32 |
| Cephalexin | 29 | 28 |
| Amoxicillin | 28 | 27 |
| Azithromycin | 28 | 23 |
| Doxycycline Hyclate | 27 | 27 |
| Prednisone | 20 | 19 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 17 | 16 |
Practice location
Mailing address
Additional practice locations (2)
- 2720 Evergreen DrGreat Falls, MT 59404-3636Phone: (406) 899-6589
- 1401 25th St SGreat Falls, MT 59405-5183Phone: (406) 731-8888Fax: (406) 731-8318
Registry dates
- Enumerated
- 2005-10-31
- Last updated
- 2021-10-07
- Certified
- 2021-10-07
Frequently asked questions
- What is Mark Buck's NPI number?
- Mark Buck's National Provider Identifier (NPI) is 1801887815, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Buck's specialty?
- Mark Buck is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Buck located?
- Mark Buck's practice location on file with NPPES is 2960 N Washington St, Helena, MT 59602-1210.
- What is Mark Buck's phone number?
- The practice phone number listed in the NPPES registry for Mark Buck is (406) 389-2555.
- Does Mark Buck accept Medicare?
- Mark Buck is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Buck's NPI active?
- Yes — Mark Buck's NPI (1801887815) is active in the NPPES registry as of the last update on 2021-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.