DR. ANN MARIE COLLIER MD
NPI 1487898458
Psychiatry & Neurology - Neurology in Billings, MT
About Dr. Ann Marie Collier Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANN MARIE COLLIER MD (NPI 1487898458) is an individual neurology provider in Billings, Montana, licensed in Montana (33458) and active in the NPI registry since April 2009. She is enrolled in Medicare PECOS, is affiliated with Riverside Medical Center, and maintains 24 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 24
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. Ann Marie Collier 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 Reassignments
18Medicare enrollment records show Ann Collier reassigns Medicare billing to 18 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Craig, CO 81625
- Reassigned Medicare billing, Colorado enrollment
- 438 clinicians in this Medicare group
Bishop, CA 93514
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Northern Inyo Healthcare District
- Also billed through NPI 1922198712 (California)
- 131 clinicians in this Medicare group
Joplin, MO 64804
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1679517023 (Missouri)
- 171 clinicians in this Medicare group
Jefferson City, MO 65109
- Reassigned Medicare billing, Missouri enrollment
- 74 clinicians in this Medicare group
Kankakee, IL 60901
- Reassigned Medicare billing, Illinois enrollment
- 381 clinicians in this Medicare group
Mishawaka, IN 46544
- Reassigned Medicare billing, Indiana enrollment
- 1,396 clinicians in this Medicare group
Bainbridge, IN 46105
- Reassigned Medicare billing, Indiana enrollment
- 401 clinicians in this Medicare group
Hammond, LA 70403
- Reassigned Medicare billing, Colorado and Louisiana enrollments
- Also billed through NPI 1972630705 (Louisiana)
- 3 clinicians in this Medicare group
Calhoun, GA 30701
- Reassigned Medicare billing, Georgia enrollment
- 384 clinicians in this Medicare group
Norton, VA 24273
- Reassigned Medicare billing, Tennessee and Virginia enrollments
- 861 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 7
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.
Riverside Medical Center
Acute Care Hospitals · Kankakee, ILFreeman Health System - Freeman West
Acute Care Hospitals · Joplin, MOPhysician 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.
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 Ann Collier's NPI number?
The NPI number for Ann Collier is 1487898458. It was assigned to this individual provider in the NPPES registry on April 21, 2009. The provider is also known as Ann Marie Potter.
Where is Ann Collier located?
Ann Collier practices at 801 N 29th St, Billings, MT 59101. The listed phone number is (406) 238-2500.
What is Ann Collier's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is Ann Collier enrolled in Medicare?
Yes. Ann Collier 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 Ann Collier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ann Collier reassigns Medicare benefits to 18 organizations: Intermountain Medical Group Grand Junction, LLC (Craig, CO), Northern Inyo Associates (Bishop, CA), Freeman-Oak Hill Health System (Joplin, MO), Ssm Regional Health Services (Jefferson City, MO), Riverside Health System (Kankakee, IL) and 13 more organizations, 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 Ann Collier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ann Collier accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of NC, CareSource, Cigna Healthcare and CommunityCare and 2 other insurers list Ann Collier 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 Ann Collier affiliated with any hospitals?
According to CMS data, Ann Collier is affiliated with Riverside Medical Center and Freeman Health System - Freeman West.
When was this NPI record last updated?
The NPPES record for Ann Collier was last updated on June 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Ann Marie Collier, MD · NPI 1487898458
Neurology physician in Billings, Montana. Individual provider, active in the CMS NPPES registry since April 21, 2009.
## Identity
- **NPI:** 1487898458 (Entity type: Individual)
- **Enumerated:** April 21, 2009
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **State license:** 33458 (Montana)
- **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:** 18 organizations under Medicare reassignment (form CMS-855R): Intermountain Medical Group Grand Junction, LLC (NPI 1245843481, Craig, CO); Northern Inyo Associates (NPI 1649664848, Bishop, CA); Freeman-Oak Hill Health System (NPI 1891809679, Joplin, MO); Ssm Regional Health Services (NPI 1033135496, Jefferson City, MO); Riverside Health System (NPI 1336354430, Kankakee, IL); and 13 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** June 15, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1487898458) · Data from the CMS NPPES public registry.