ERIN ANNE BERNTSEN ACNP
NPI 1205640489
Nurse Practitioner - Acute Care in Fairfield, CA
About Erin Anne Berntsen Acnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ERIN ANNE BERNTSEN ACNP (NPI 1205640489) is an individual acute care provider in Fairfield, California, licensed in California (95033845) and active in the NPI registry since February 2025. She is enrolled in Medicare PECOS, maintains a secondary practice location in Sacramento, and is a graduate of University Of South Alabama College Of Medicine (2024).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Location 1
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
Erin Anne Berntsen Acnp 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
3Medicare enrollment records show Erin Berntsen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fairfield, CA 94533
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Northbay Physicians Surgery Center, LLC
- 516 clinicians in this Medicare group
Davis, CA 95616
- Reassigned Medicare billing, California enrollment
- 2,570 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94533 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.
FAIRFIELD, CA 94533
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 Erin Berntsen's NPI number?
The NPI number for Erin Berntsen is 1205640489. It was assigned to this individual provider in the NPPES registry on February 6, 2025. The provider is also known as Erin Anne Gilles.
Where is Erin Berntsen located?
Erin Berntsen practices at 1200 B Gale Wilson Blvd, Fairfield, CA 94533. The listed phone number is (707) 646-5031.
What is Erin Berntsen's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.
Is Erin Berntsen enrolled in Medicare?
Yes. Erin Berntsen 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 Erin Berntsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Erin Berntsen reassigns Medicare benefits to 3 organizations: Northbay Healthcare Group (Fairfield, CA), Regents Of The Univ Of Ca (Davis, CA) and Inpatient Specialists Of California, PC (San Bernardino, CA). 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 Erin Berntsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Erin Berntsen was last updated on July 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Erin Anne Berntsen, ACNP · NPI 1205640489
Acute Care physician in Fairfield, California. Individual provider, active in the CMS NPPES registry since February 6, 2025.
## Identity
- **NPI:** 1205640489 (Entity type: Individual)
- **Enumerated:** February 6, 2025
- **Primary specialty:** Nurse Practitioner - Acute Care · taxonomy 363LA2100X
- **State license:** 95033845 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1200 B GALE WILSON BLVD, Fairfield, CA 94533-3587
- **Phone:** (707) 646-5031
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Northbay Healthcare Group (NPI 1821147786, Fairfield, CA); Regents Of The Univ Of Ca (NPI 1053304071, Davis, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of South Alabama College Of Medicine, class of 2024
## Record status
- **NPPES last updated:** July 6, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1205640489) · Data from the CMS NPPES public registry.