Aaron Tenharmsel, MD
Family Medicine Physician · Billings, MT
Aaron Tenharmsel, MD is a family medicine physician with a practice address in Billings, Montana, and NPI 1255623583, issued on May 4, 2011. Check the license (Montana MED-PHYS-LIC-33530, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Aaron Tenharmsel
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MED-PHYS-LIC-33530 MT
Self-reported in NPPES; status is on the state search - Practice location
- 1233 N 30TH St, Billings, MT 59101
- Phone
- (406) 237-7000
- Enumerated
- May 4, 2011
- Record last updated
- Jul 2, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140814001661); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 2011
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 775 in Montana → Look up another NPI →
Also registered at 1233 N 30TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Abigail AgatepPharmacist1285505024
- Carole Anderson, NNP-BCNeonatal Nurse Practitioner1255617742
- Ty Anderson, MDEmergency Medicine Physician1043889033
- William Anderson, MDPhysical Medicine & Rehabilitation Physician1730125006
- Dean Angell, RNFlight Registered Nurse1265718183
- Charles Aragon, M.D.Anesthesiology Physician1093782591
Verify Aaron Tenharmsel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license MED-PHYS-LIC-33530Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family medicine physician in 2024
248 Medicare Part D claims for 101 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Cefuroxime16 claims
- Brilinta15 claims
- Spironolactone11 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.
Bills Medicare through one group practice
- Cogent Healthcare OF Montana P CBillings, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aaron Tenharmsel among 775 family medicine physician records in Montana
Aaron Tenharmsel, MD 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 2011, is newer than 70% of them.
- NPI issued2011 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2011 · median 2007 among the 464 with a school on file
- Record last updated2016 · 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).
111 family medicine physician records list a practice address in Billings
They are 111 of the 4,035 NPPES records with a practice address in Billings, and 775 family medicine physician records in Montana.
All 775 in Montana → Every provider in Billings → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Dale Agner, M.D.Billings, MT 591011861486490
- Bryn Burnham, D.O.Billings, MT 591011164476693
- Emily Colson, MDBillings, MT 591011952397929
- Diana Doll, MDBillings, MT 591011942263405
- Roxanne Fahrenwald, MDBillings, MT 591011104810688
- Paolo Gerbasi, MDBillings, MT 591011134166622
- James Guyer, M.D.Billings, MT 591011962495697
- Thomas James, MDBillings, MT 591011831183482
Common questions
What is Aaron Tenharmsel, MD's NPI number?
Aaron Tenharmsel, MD's National Provider Identifier (NPI) is 1255623583, issued on May 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Aaron Tenharmsel, MD located?
The NPPES record lists a practice address at 1233 N 30TH St, Billings, MT, 59101. Phone: (406) 237-7000. Providers update this record themselves, so call before visiting.
How can I verify Aaron Tenharmsel, MD's license?
NPPES lists Montana license number MED-PHYS-LIC-33530, 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 Aaron Tenharmsel, MD prescribe under Medicare Part D?
In 2024, Aaron Tenharmsel, MD had 248 Medicare Part D claims for 101 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.