DR. NATHANIEL RIEB M.D.
NPI 1508068834
Surgery in Billings, MT
About Dr. Nathaniel Rieb M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHANIEL RIEB M.D. (NPI 1508068834) is an individual surgery provider in Billings, Montana, licensed in Wyoming (1345) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Billings Clinic, and maintains a secondary practice location in Powell.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Nathaniel Rieb 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.
Medicare Billing Reassignments
6Medicare enrollment records show Nathaniel Rieb reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Billings, MT 59101
- Reassigned Medicare billing, Montana and Wyoming enrollments
- Also billed through NPI 1346288347 (Wyoming)
- 1,264 clinicians in this Medicare group
Pryor, MT 59066
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: U S Health Dept Of Health & Human Services
- 306 clinicians in this Medicare group
Columbus, MT 59019
- Reassigned Medicare billing, Montana enrollment
- 86 clinicians in this Medicare group
Red Lodge, MT 59068
- Reassigned Medicare billing, Montana enrollment
- Also billed through NPI 1184785099 (Montana)
- 61 clinicians in this Medicare group
Lovell, WY 82431
- Reassigned Medicare billing, Wyoming enrollment
- Medicare enrollment name: North Big Horn Hospital District
- 65 clinicians in this Medicare group
Glendive, MT 59330
- Reassigned Medicare billing, Montana enrollment
- 53 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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Billings Clinic
Acute Care Hospitals · Billings, MTBeartooth Billings Clinic
Critical Access Hospitals · Red Lodge, MTStillwater Billings Clinic
Critical Access Hospitals · Columbus, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59101 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.
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.
BILLINGS, MT 59101
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 Nathaniel Rieb's NPI number?
The NPI number for Nathaniel Rieb is 1508068834. It was assigned to this individual provider in the NPPES registry on May 31, 2007.
Where is Nathaniel Rieb located?
Nathaniel Rieb practices at 801 N 29th St, Billings, MT 59101. The listed phone number is (406) 238-2500.
What is Nathaniel Rieb's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Nathaniel Rieb enrolled in Medicare?
Yes. Nathaniel Rieb 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 organizations bill Medicare for Nathaniel Rieb's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Rieb reassigns Medicare benefits to 6 organizations: Billings Clinic (Billings, MT), Us Health Dept Of Health & Human Services (Pryor, MT), Stillwater Hospital Association, Inc. (Columbus, MT), Memorial Hospital Association (Red Lodge, MT), North Big Horn Hospital (Lovell, WY) and 1 more organization, listed in the Medicare section above. Each 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 Nathaniel Rieb's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathaniel Rieb accept?
Health plans from Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and Providence Health Plan list Nathaniel Rieb 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 Nathaniel Rieb affiliated with any hospitals?
According to CMS data, Nathaniel Rieb is affiliated with Billings Clinic, Beartooth Billings Clinic and Stillwater Billings Clinic.
When was this NPI record last updated?
The NPPES record for Nathaniel Rieb was last updated on December 20, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Nathaniel Rieb, M.D. · NPI 1508068834
Surgery physician in Billings, Montana. Individual provider, active in the CMS NPPES registry since May 31, 2007.
## Identity
- **NPI:** 1508068834 (Entity type: Individual)
- **Enumerated:** May 31, 2007
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** 1345 (Wyoming)
- **Sole proprietor:** No
## Practice location
- **Address:** 801 N 29TH ST, Billings, MT 59101-0905
- **Phone:** (406) 238-2500
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Billings Clinic (NPI 1376598714, Billings, MT); Us Health Dept Of Health & Human Services (NPI 1407076219, Pryor, MT); Stillwater Hospital Association, Inc. (NPI 1053488387, Columbus, MT); Memorial Hospital Association (NPI 1336119338, Red Lodge, MT); North Big Horn Hospital (NPI 1750485793, Lovell, WY); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 2005
## Record status
- **NPPES last updated:** December 20, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1508068834) · Data from the CMS NPPES public registry.