Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Gregory S Tierney, MD

Individual provider Sports Medicine (Orthopaedic Surgery) Physician · NPI 1679519870

Dr. Gregory S Tierney, MD is an Orthopedic Surgery in Great Falls, Montana. Graduated from University of Washington School of Medicine in 1988, 38 years ago. Practices with Benefis Hospitals Inc, a 398-clinician group and accepts Medicare assignment. Licensed in Montana.

Years since qualifying
38
Trained at
University of Washington School of Medicine
Licensed in
MT
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1401 25th St S
Great Falls, MT 59405-5183
Phone: (406) 731-8888
Fax: (406) 731-8876
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Sports Medicine (Orthopaedic Surgery) Physician (primary) Taxonomy 207XX0005X · Licence 7579 (MT)

Record details

NPI number1679519870
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 22, 2006
Last updated in NPPESApril 5, 2024
Certification dateDecember 8, 2022
Mailing address1401 25th St S, Great Falls, MT 59405-5183

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Benefis Hospitals Inc — 398 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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