Dr. John W. Mahan III, MD
- Medicare services, 2024
- 1,053
- Medicare patients, 2024
- 162
- Part D claims, 2024
- 543
- MIPS score, 2024
- 83
- Industry payments
- $57
- Practice address
- 1101 26th S St, Great Falls, MT 59405
- Practice phone
- Call (406) 455-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Benefis Health System
Great Falls, Montana
Find Dr. Mahan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John W. Mahan III is a hospitalist in Great Falls, Montana
Dr. Mahan practices at Benefis Health System in Great Falls, Montana.
Dr. Mahan's NPI, 1346241296, was assigned on August 2, 2005. Dr. Mahan graduated from University of New Mexico School of Medicine in 1989. Dr. Mahan holds Montana license 7173.
- NPI
- 1346241296NPI Registry (opens in a new tab)
- NPI enumeration date
- August 2, 2005
- NPI status
- Active
- Practice phone
- (406) 455-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John W. Mahan III practices at Benefis Health System in Great Falls, Montana
Dr. Mahan's primary practice is Benefis Health System, at 1101 26th S St, Great Falls, MT 59405 in Cascade County. The practice phone is (406) 455-5000.
- Benefis Health System1101 26th S St, Great Falls, MT 59405 · Cascade CountyPhone(406) 455-5000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John W. Mahan III is affiliated with 1 site of care and 1 medical group
Dr. Mahan's primary practice is Benefis Health System in Great Falls, Montana. The medical group on file is Benefis Health System.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John W. Mahan III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mahan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Benefis Health System | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John W. Mahan III is one of 102 hospitalists in Montana
Hospitalist is Dr. Mahan's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Mahan is licensed in Montana.
Specialties and state licenses
- Hospitalist, MontanaPrimary
Hospitalists near Dr. Mahan
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John W. Mahan III billed Medicare for 1,053 services in 2024
CMS data shows 1,053 Medicare services from Dr. Mahan across 4 procedure codes in 2024, for 162 Medicare patients. Medicare paid $80,733 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Mahan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,1162024: 1,0536%
Dr. Mahan compared with the Montana median for hospitalists, 2024
- Dr. Mahan
- Montana median
- Medicare services
- 1,053vs 4802.2 times
- Medicare patients
- 162vs 19617% below
- Part D claims
- 273vs 485.7 times
Medians across 101 hospitalists in Montana with Dmand AI profiles that report each measure.
Dr. Mahan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Mahan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mahan and other hospitalists in Montana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John W. Mahan III treated 162 Medicare patients in 2024, average age 77
CMS counts 162 Medicare patients who saw Dr. Mahan in 2024. The largest group is 75 to 84, with 64 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 1.48, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mahan's median patient age at 70, with 78% women.
Dr. Mahan's Medicare patients by age, 2024
Dr. Mahan's Medicare patients by sex, 2024
- Women7748%
- Men8552%
Chronic conditions among Dr. Mahan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis65%
- Mood disorders56%
- Depression54%
- Stroke or TIA51%
- Diabetes41%
- Anxiety38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women78%
- Men22%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John W. Mahan III wrote 543 Medicare Part D claims in 2024
In 2024, Dr. Mahan wrote 543 Medicare Part D claims for 105 patients. 87% of them were for generic drugs. CMS names the drug for 273 of them, across 14 drugs with 11 or more claims each, at $11,291 in total drug cost. In 2023, CMS named 191 claims across 10 drugs.
Dr. Mahan's Part D claims by kind of drug, 2024
- Generic474 claims87%
- Brand-name and other69 claims13%
Dr. Mahan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mahan's Part D claims, 2024
- Antibiotics3%19 of 543 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1912024: 27343%
Drugs named by CMS: 14 in 2024, 10 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. John W. Mahan III scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Mahan for performance year 2024, reported as part of a group.
Dr. Mahan's MIPS scores, performance year 2024
- 83of 100Final score
- 62.6of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 81of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John W. Mahan III received $57 in industry payments from 2016 to 2018
CMS Open Payments shows 4 general payments to Dr. Mahan from 3 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $22.
General payments to Dr. Mahan by program year, 2016 to 2018
Companies that paid Dr. Mahan the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John W. Mahan III graduated from University of New Mexico School of Medicine
Dr. Mahan graduated from University of New Mexico School of Medicine in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John W. Mahan III's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John W. Mahan III
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John W. Mahan III's NPI number?
Dr. John W. Mahan III's NPI number is 1346241296. It was assigned on August 2, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John W. Mahan III?
Dr. John W. Mahan III is a hospitalist in Great Falls, Montana. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. John W. Mahan III practice?
Dr. Mahan practices at 1101 26th S St, Great Falls, MT 59405. Dr. Mahan's primary practice is Benefis Health System in Great Falls, Montana.
What is Dr. John W. Mahan III's office phone number?
The practice phone on file for Dr. Mahan is (406) 455-5000.
What is Dr. John W. Mahan III's medical license number?
Dr. Mahan holds Montana license 7173.
What medical group is Dr. John W. Mahan III part of?
Dr. Mahan is linked to Benefis Health System.
Does Dr. John W. Mahan III accept Medicare?
Yes. CMS data shows Dr. Mahan billed Medicare for 1,053 services in 2024.
What is Dr. John W. Mahan III's MIPS score?
Dr. Mahan's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
How many Medicare patients does Dr. John W. Mahan III see?
CMS counts 162 Medicare patients who saw Dr. Mahan in 2024, with an average age of 77.
What services does Dr. John W. Mahan III bill to Medicare?
In 2024, Dr. Mahan's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99223).
Show 4 more questionsShow fewer questions
Where did Dr. John W. Mahan III go to medical school?
Dr. Mahan graduated from University of New Mexico School of Medicine in 1989.
What drugs does Dr. John W. Mahan III prescribe most?
In 2024 Medicare Part D data, Dr. Mahan's most prescribed drugs by claims were Atorvastatin Calcium, Trazodone HCl and Amlodipine Besylate.
Has Dr. John W. Mahan III received payments from drug or device companies?
CMS Open Payments shows $57 in general payments to Dr. Mahan from 3 companies from 2016 to 2018. The largest total came from Pfizer Inc.
How long has Dr. John W. Mahan III been practicing?
Dr. Mahan graduated from medical school in 1989, 37 years ago.
Selling to hospitalist practices?
See hospitalists in Montana by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card