Gregory S. Tierney, M.D.
Sports Medicine (Orthopaedic Surgery) Physician · Great Falls, MT
Gregory S. Tierney, M.D. is a sports medicine (orthopaedic surgery) physician with a practice address in Great Falls, Montana, and NPI 1679519870, issued on Jun 22, 2006. Check the license (Montana 7579, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Gregory S. Tierney
- Credential
- M.D.
- Primary taxonomy
- Sports Medicine (Orthopaedic Surgery) Physician 207XX0005X
- License number
- 7579 MT
Self-reported in NPPES; status is on the state search - Practice location
- 1401 25TH St S, Great Falls, MT 59405
- Phone
- (406) 731-8888
- Enumerated
- Jun 22, 2006
- Record last updated
- Apr 5, 2024
- Fax
- (406) 731-8876
- Medicaid ID
- 0103571 MT
- Medicare enrollment
- Enrolled (PECOS I20100507000667); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1988
- Entity
- Type 1 · individual
8 nearest sports medicine (orthopaedic surgery) physician records → All 19 in Montana → Look up another NPI →
Also registered at 1401 25TH St S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jill Aitken, AUDAudiologist1730386020
- Jamie Aleba, PAMedical Physician Assistant1184929572
- Thomas Attaway, MDGastroenterology Physician1922012442
- Lily AvgustovskiyNurse Practitioner1093122335
Verify Gregory S. Tierney in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 7579Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average sports medicine (orthopaedic surgery) physician in 2024
12 Medicare Part D claims, against an average of 288 among the 2,562 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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 IncGreat Falls, 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.
Gregory S. Tierney among 19 sports medicine (orthopaedic surgery) physician records in Montana
Gregory S. Tierney, M.D. is one of 19 sports medicine (orthopaedic surgery) physician records with a practice address in Montana. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 26% of them.
- NPI issued2006 · 26% of these records are older, 47% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 84% of these records are
- Graduated1988 · median 2002 among the 16 with a school on file
- Record last updated2024 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XX0005X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sports Medicine (Orthopaedic Surgery) Physician providers in Montana
There are 19 sports medicine (orthopaedic surgery) physician records in Montana.
All 19 in Montana → Every provider in Great Falls → Sports Medicine (Orthopaedic Surgery) Physician nationwide →
The 8 sports medicine (orthopaedic surgery) physician records with the nearest ZIP codes
- Andrew Blackman, MDGreat Falls, MT 594051295998771
- Jessica Hart, MDGreat Falls, MT 594051790121580
- Patrick Thomas, M.D.Great Falls, MT 594051538103502
- Brean McCarthy, D.O.Glasgow, MT 592301154577856
- Joshua Bowler, M.D.Billings, MT 591011164819199
- Noah Marks, M.DBillings, MT 591011457521882
- Guy Schmidt, MDBillings, MT 591011922090604
- David Shenton, M.D.Billings, MT 591011033154760
Common questions
What is Gregory S. Tierney, M.D.'s NPI number?
Gregory S. Tierney, M.D.'s National Provider Identifier (NPI) is 1679519870, issued on Jun 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory S. Tierney, M.D. located?
The NPPES record lists a practice address at 1401 25TH St S, Great Falls, MT, 59405. Phone: (406) 731-8888. Providers update this record themselves, so call before visiting.
How can I verify Gregory S. Tierney, M.D.'s license?
NPPES lists Montana license number 7579, 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 Gregory S. Tierney, M.D. prescribe under Medicare Part D?
In 2024, Gregory S. Tierney, M.D. had 12 Medicare Part D claims; the average among sports medicine (orthopaedic surgery) physician prescribers was 288. Part D covers Medicare prescriptions only.
What is Gregory S. Tierney, 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.