John Mahan, MD
NPI 1346241296 · Hospitalist Physician · Great Falls, MT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mahan, MD is a Hospitalist Physician provider in Great Falls, MT (NPI 1346241296).
Provider details
- NPI number
- 1346241296
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 7173 (MT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,053 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 503 | $77 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 267 | $115 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 153 | $169 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 130 | $48 |
Typical Medicare-allowed amounts for these services range $48–$169 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 34 | 22 |
| Trazodone Hcl | 31 | 24 |
| Amlodipine Besylate | 27 | 20 |
| Pantoprazole Sodium | 20 | 19 |
| Losartan Potassium | 20 | 13 |
| Metoprolol Succinate | 18 | 12 |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-02
- Last updated
- 2024-04-08
- Certified
- 2024-04-08
Frequently asked questions
- What is John Mahan's NPI number?
- John Mahan's National Provider Identifier (NPI) is 1346241296, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mahan's specialty?
- John Mahan is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is John Mahan located?
- John Mahan's practice location on file with NPPES is 1101 26th St S, Great Falls, MT 59405-5161.
- What is John Mahan's phone number?
- The practice phone number listed in the NPPES registry for John Mahan is (406) 731-8888.
- Does John Mahan accept Medicare?
- John Mahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mahan's NPI active?
- Yes — John Mahan's NPI (1346241296) is active in the NPPES registry as of the last update on 2024-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.