Carolyn Sierra Rust, M.D.
Emergency Medicine Physician · Great Falls, MT
Carolyn Sierra Rust, M.D. is an emergency medicine physician with a practice address in Great Falls, Montana, and NPI 1992097695, issued on May 12, 2011. Check the license (Montana 55916, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Carolyn Sierra Rust
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 55916 MT
DR.0053676 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1101 26TH St S, Great Falls, MT 59405
- Phone
- (406) 455-5200
- Enumerated
- May 12, 2011
- Record last updated
- Oct 6, 2025
- Medicare enrollment
- Enrolled (PECOS I20170419001001); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 2011
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 243 in Montana → Look up another NPI →
Also registered at 1101 26TH St S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Khansa AliStudent in an Organized Health Care Education/Training Program1497632277
- Jeffrey Allen, CRNACertified Registered Nurse Anesthetist1245256916
- Batool Alnahar, MBBSStudent in an Organized Health Care Education/Training Program1447137310
Verify Carolyn Sierra Rust in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 55916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average emergency medicine physician in 2024
62 Medicare Part D claims for 37 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
Carolyn Sierra Rust among 243 emergency medicine physician records in Montana
Carolyn Sierra Rust, M.D. is one of 243 emergency medicine physician records with a practice address in Montana. 81% 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 64% of them.
- NPI issued2011 · 64% of these records are older, 31% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2011 · median 2009 among the 144 with a school on file
- Record last updated2025 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 emergency medicine physician records list a practice address in Great Falls
They are 29 of the 1,798 NPPES records with a practice address in Great Falls, and 243 emergency medicine physician records in Montana.
All 243 in Montana → Every provider in Great Falls → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Michael Adams, MDGreat Falls, MT 594051770576555
- Andrew Barber, D.O.Great Falls, MT 594051588776355
- Nicholas Burnham, DOGreat Falls, MT 594051962795559
- Philip Donahue, FNPGreat Falls, MT 594051770691214
- Gerald Geiszler, M.D.Great Falls, MT 594051841344132
- Robert Harper, D.O.Great Falls, MT 594051649382581
- Michael Jasumback, MDGreat Falls, MT 594051114947843
- Justin MadillGreat Falls, MT 594051578534715
Common questions
What is Carolyn Sierra Rust, M.D.'s NPI number?
Carolyn Sierra Rust, M.D.'s National Provider Identifier (NPI) is 1992097695, issued on May 12, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Carolyn Sierra Rust, M.D. located?
The NPPES record lists a practice address at 1101 26TH St S, Great Falls, MT, 59405. Phone: (406) 455-5200. Providers update this record themselves, so call before visiting.
How can I verify Carolyn Sierra Rust, M.D.'s license?
NPPES lists Montana license number 55916, 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 Carolyn Sierra Rust, M.D. prescribe under Medicare Part D?
In 2024, Carolyn Sierra Rust, M.D. had 62 Medicare Part D claims for 37 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Carolyn Sierra Rust, 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.