KAREN CHESTNUT FNP
NPI 1144577347
Nurse Practitioner - Family in Oxnard, CA
About Karen Chestnut Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN CHESTNUT FNP (NPI 1144577347) is an individual family provider in Oxnard, California, licensed in California (22385) and active in the NPI registry since August 2012. She is enrolled in Medicare PECOS and is a graduate of Other (2012).
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
Karen Chestnut Fnp 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 Karen Chestnut reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oxnard, CA 93030
- Reassigned Medicare billing, California enrollment
- 1,204 clinicians in this Medicare group
Cambria, CA 93428
- Reassigned Medicare billing, California enrollment
- 6 clinicians in this Medicare group
Cambria, CA 93428
- Reassigned Medicare billing, California enrollment
- 7 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 10
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93030 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.
OXNARD, CA 93030
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 Karen Chestnut's NPI number?
The NPI number for Karen Chestnut is 1144577347. It was assigned to this individual provider in the NPPES registry on August 7, 2012.
Where is Karen Chestnut located?
Karen Chestnut practices at 1600 N Rose Ave, Oxnard, CA 93030. The listed phone number is (805) 550-4478.
What is Karen Chestnut's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Karen Chestnut enrolled in Medicare?
Yes. Karen Chestnut 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 Karen Chestnut's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Chestnut reassigns Medicare benefits to 3 organizations: Cep America - California (Oxnard, CA), Dr Dave Griffith Inc (Cambria, CA) and Richard David Griffith MD, Inc. (Cambria, 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 Karen Chestnut'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 Karen Chestnut was last updated on September 20, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Karen Chestnut, FNP · NPI 1144577347
Family physician in Oxnard, California. Individual provider, active in the CMS NPPES registry since August 7, 2012.
## Identity
- **NPI:** 1144577347 (Entity type: Individual)
- **Enumerated:** August 7, 2012
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 22385 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1600 N ROSE AVE, Oxnard, CA 93030-3722
- **Phone:** (805) 550-4478
## 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): Cep America - California (NPI 1326339748, Oxnard, CA); Dr Dave Griffith Inc (NPI 1720732597, Cambria, CA); Richard David Griffith MD, Inc. (NPI 1790201226, Cambria, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** September 20, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1144577347) · Data from the CMS NPPES public registry.