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CAROLYN SIERRA RUST M.D.
NPI 1992097695
Emergency Medicine in Great Falls, MT

Active since May 12, 2011PECOS EnrolledAccepts Medicare Assignment
80.46/100
CMS Quality Rating
1101 26TH ST S, GREAT FALLS, MT 59405(406) 455-5200 Get Directions Write a Review

NPPES record last updated: October 6, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Oct 6, 2025, Mar 9, 2018 (2 updates tracked since 2018).

About Carolyn Sierra Rust M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

CAROLYN SIERRA RUST M.D. (NPI 1992097695) is an individual emergency medicine provider in Great Falls, Montana, licensed in Montana (55916) and active in the NPI registry since May 2011. She is enrolled in Medicare PECOS, is affiliated with Benefis Hospitals Inc, and is a graduate of Albany Medical College Of Union University (2011).

NPPES Registry Identity

NPI1992097695
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameCAROLYN SIERRA RUSTCredential: M.D.
Location Address1101 26TH ST SGreat Falls, MT 59405-5161
Mailing AddressPo Box 6010Great Falls, MT 59406-6010
Phone(406) 455-5200
Sole ProprietorNo
Medical School CMSAlbany Medical College Of Union UniversityGraduated 2011
Enumeration DateMay 12, 2011
Last NPPES UpdateOctober 6, 20252 updates tracked since enumeration
NPPES CertifiedOctober 6, 2025
✔ NPI 1992097695 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in MT · 55916✔ Licensed in CO · DR.0053676
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
1101 26TH ST S, Great Falls, MT 59405
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Mountain Health CO-OP.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Carolyn Sierra Rust M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9032335799
PECOS Enrollment IDI20170419001001
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
271 services262 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
209 services194 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
30 services30 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
18 services18 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Benefis Hospitals Inc

Acute Care Hospitals · Great Falls, MT
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number270012
Location1101 26th St SGreat Falls, MT 59405 · Cascade County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 59405 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$87.97 typical visit price
range $56.81 – $172.26
Typical copayment $21.99 (range $14.20 – $43.06)
Most-billed visit code 99203
Established Patient
$100.16 typical visit price
range $18.24 – $140.32
Typical copayment $25.04 (range $4.56 – $35.08)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

80.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality93.1
Promoting Interoperability75
Improvement Activities40
Cost62.61

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

OMER USMAN MD
Hospitalist
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5000
EDMUND J BRENNAN MD
Internal Medicine (Clinical Cardiac Electrophysiology)
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 731-8888
MRS. DELENE R LYNES OTA
Occupational Therapy Assistant
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5412
DANIEL KNUFFKE
Occupational Therapist
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 781-1305
KRISTIN HUNTOON D.O, PHD
Neurological Surgery
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5000
PATRICK HUGH SMITH FNP-BC
Nurse Practitioner (Family)
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5000
DR. SAMANTHA ANNE BASCO PHARMD
Pharmacist
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5430
KELCIE LEE FOSHAG DO
Radiology (Diagnostic Radiology)
1101 26TH ST S
GREAT FALLS, MT 59405
Cascade County (406) 455-5000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Carolyn Rust's NPI number?

The NPI number for Carolyn Rust is 1992097695. It was assigned to this individual provider in the NPPES registry on May 12, 2011.

Where is Carolyn Rust located?

Carolyn Rust practices at 1101 26th St S, Great Falls, MT 59405. The listed phone number is (406) 455-5200.

What is Carolyn Rust's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Carolyn Rust enrolled in Medicare?

Yes. Carolyn Rust is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Carolyn Rust accept?

Health plans from Blue Cross and Blue Shield of Montana and Mountain Health CO-OP list Carolyn Rust as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Carolyn Rust affiliated with any hospitals?

According to CMS data, Carolyn Rust is affiliated with Benefis Hospitals Inc.

When was this NPI record last updated?

The NPPES record for Carolyn Rust was last updated on October 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.