Gregory Roger Grenier, D.O
Orthopaedic Surgery Physician · Billings, MT
Gregory Roger Grenier, D.O is an orthopaedic surgery physician with a practice address in Billings, Montana, and NPI 1134512593, issued on Mar 10, 2015. Check the license (Montana 98833, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Gregory Roger Grenier
- Credential
- D.O
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License numbers
- 98833 MT
DR.0070117 CO
Self-reported in NPPES; status is on the state search - Practice location
- 2900 12TH Ave N Ste 140W, Billings, MT 59101
- Phone
- (406) 238-6726
- Enumerated
- Mar 10, 2015
- Record last updated
- Jan 6, 2023
- Fax
- (406) 272-3395
- Medicare enrollment
- Enrolled (PECOS I20230119002368); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 105 in Montana → Look up another NPI →
Also registered at 2900 12TH Ave N Ste 140W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Garrett Baldry, OTD,OTR-LOccupational Therapist1578134003
- Lindsey Beck, DOPhysical Medicine & Rehabilitation Physician1043570880
- Nicholas Beck, MDOrthopaedic Hand Surgery Physician1346509759
- Duncan BoothbyOccupational Therapist1306212816
- Joshua Bowler, M.D.Sports Medicine (Orthopaedic Surgery) Physician1164819199
- Benjamin Braun, M.D.Orthopaedic Surgery of the Spine Physician1922461508
Verify Gregory Roger Grenier in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 98833Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
118 Medicare Part D claims for 50 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 36 claims were for opioids.
Most prescribed
- Cephalexin18 claims
- Methocarbamol16 claims
- Hydrocodone-Acetaminophen15 claims
- Methylprednisolone14 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): 88.2 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).
Industry payments in 2024: $1,172.38
7 payments; by number, the most common kind was food and beverage; the largest payer was Gemini Mountain Medical, LLC. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Catholic Health Initiatives ColoradoDurango, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Roger Grenier among 105 orthopaedic surgery physician records in Montana
Gregory Roger Grenier, D.O is one of 105 orthopaedic surgery physician records with a practice address in Montana. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 91% of them.
- NPI issued2015 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2015 · median 2006 among the 59 with a school on file
- Record last updated2023 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in Montana
There are 105 orthopaedic surgery physician records in Montana.
All 105 in Montana → Every provider in Billings → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Alan Dacre, MDBillings, MT 591011457343147
- John Dorr, M.D.Billings, MT 591011750388609
- James Elliott, MDBillings, MT 591011235121849
- Joseph Erpelding, MDBillings, MT 591011194717959
- Steven Fischer, MDBillings, MT 591011710098587
- Steven Klepps, M.D.Billings, MT 591011467488387
- Matthew Kopplin, MDBillings, MT 591011598850984
- Gregory McDowell, MDBillings, MT 591011326030172
Common questions
What is Gregory Roger Grenier, D.O's NPI number?
Gregory Roger Grenier, D.O's National Provider Identifier (NPI) is 1134512593, issued on Mar 10, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Roger Grenier, D.O located?
The NPPES record lists a practice address at 2900 12TH Ave N Ste 140W, Billings, MT, 59101. Phone: (406) 238-6726. Providers update this record themselves, so call before visiting.
How can I verify Gregory Roger Grenier, D.O's license?
NPPES lists Montana license number 98833, 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 Roger Grenier, D.O prescribe under Medicare Part D?
In 2024, Gregory Roger Grenier, D.O had 118 Medicare Part D claims for 50 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
What is Gregory Roger Grenier, D.O's MIPS final score?
The 2023 MIPS final score is 88.2 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.