CORI LEE CHASTAIN FNP-C
NPI 1265143416
Nurse Practitioner - Family in Irvine, CA
About Cori Lee Chastain Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CORI LEE CHASTAIN FNP-C (NPI 1265143416) is an individual family provider in Irvine, California, licensed in California (NP95022821) and active in the NPI registry since December 2022. She is enrolled in Medicare PECOS and is a graduate of Other (2022).
NPPES Registry Identity
Specialties & Licenses
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
Cori Lee Chastain Fnp-c 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 Cori Chastain reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Newport Beach, CA 92663
- Reassigned Medicare billing, California enrollment
- 529 clinicians in this Medicare group
Downey, CA 90241
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: The Oncology Institute Ca, A Professional Corporation
- 110 clinicians in this Medicare group
Duarte, CA 91010
- Reassigned Medicare billing, California enrollment
- 1,335 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 92618 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.
IRVINE, CA 92618
IRVINE, CA 92618
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 Cori Chastain's NPI number?
The NPI number for Cori Chastain is 1265143416. It was assigned to this individual provider in the NPPES registry on December 8, 2022.
Where is Cori Chastain located?
Cori Chastain practices at 1000 Fivepoint, Irvine, CA 92618. The listed phone number is (949) 868-2633.
What is Cori Chastain's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Cori Chastain enrolled in Medicare?
Yes. Cori Chastain 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 Cori Chastain's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cori Chastain reassigns Medicare benefits to 3 organizations: Hoag Clinic (Newport Beach, CA), Starling Oncology Ca, A Professional Corporation (Downey, CA) and City Of Hope Medical Foundation (Duarte, 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 Cori Chastain'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 Cori Chastain was last updated on October 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days 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.
# Cori Lee Chastain, FNP-C · NPI 1265143416
Family physician in Irvine, California. Individual provider, active in the CMS NPPES registry since December 8, 2022.
## Identity
- **NPI:** 1265143416 (Entity type: Individual)
- **Enumerated:** December 8, 2022
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** NP95022821 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1000 FIVEPOINT, Irvine, CA 92618-2377
- **Phone:** (949) 868-2633
## 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): Hoag Clinic (NPI 1942799523, Newport Beach, CA); Starling Oncology Ca, A Professional Corporation (NPI 1275651515, Downey, CA); City Of Hope Medical Foundation (NPI 1871886366, Duarte, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** October 9, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1265143416) · Data from the CMS NPPES public registry.