DR. STEPHEN JOHN MEST MD
NPI 1093816621
Internal Medicine in Helena, MT
About Dr. Stephen John Mest Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN JOHN MEST MD (NPI 1093816621) is an individual internal medicine provider in Helena, Montana, licensed in Montana (8243) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with St Peters Health, and is a graduate of University Of Washington School Of Medicine (1993).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Stephen John Mest Md 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.
Medicare Billing Reassignment
Medicare enrollment records show Stephen Mest reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Helena, MT 59601
- Reassigned Medicare billing, Montana enrollment
- Medicare enrollment name: St Peters Health
- 304 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Peters Health
Acute Care Hospitals · Helena, MTBillings Clinic Broadwater
Critical Access Hospitals · Townsend, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59601 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HELENA, MT 59601
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 Stephen Mest's NPI number?
The NPI number for Stephen Mest is 1093816621. It was assigned to this individual provider in the NPPES registry on September 26, 2006.
Where is Stephen Mest located?
Stephen Mest practices at 2475 Broadway, Helena, MT 59601. The listed phone number is (406) 457-4180.
What is Stephen Mest's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Stephen Mest enrolled in Medicare?
Yes. Stephen Mest 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.
Which organization bills Medicare for Stephen Mest's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Mest reassigns Medicare benefits to St Peters Hospital (Helena, MT). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen Mest's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stephen Mest accept?
Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP and Providence Health Plan list Stephen Mest 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 Stephen Mest affiliated with any hospitals?
According to CMS data, Stephen Mest is affiliated with St Peters Health and Billings Clinic Broadwater.
When was this NPI record last updated?
The NPPES record for Stephen Mest was last updated on April 12, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years 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.
# Dr. Stephen John Mest, MD · NPI 1093816621
Internal Medicine physician in Helena, Montana. Individual provider, active in the CMS NPPES registry since September 26, 2006.
## Identity
- **NPI:** 1093816621 (Entity type: Individual)
- **Enumerated:** September 26, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 8243 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 2475 BROADWAY, Helena, MT 59601
- **Phone:** (406) 457-4180
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** St Peters Hospital (NPI 1710152277, Helena, MT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 1993
## Record status
- **NPPES last updated:** April 12, 2018
- **Other identifiers:** Medicaid 0086258 (MT); Other 98825 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1093816621) · Data from the CMS NPPES public registry.