HAZEL ABAYA
NPI 1780116186
Internal Medicine in Thousand Oaks, CA
About Hazel Abaya NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HAZEL ABAYA (NPI 1780116186) is an individual internal medicine provider in Thousand Oaks, California, licensed in California (A169439) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS and is a graduate of Other (2016).
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
Hazel Abaya 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
4Medicare enrollment records show Hazel Abaya reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Agoura Hills, CA 91301
- Reassigned Medicare billing, California enrollment
- 18 clinicians in this Medicare group
Whittier, CA 90605
- Reassigned Medicare billing, California enrollment
- 96 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 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 8
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 91360 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Hazel Abaya's NPI number?
The NPI number for Hazel Abaya is 1780116186. It was assigned to this individual provider in the NPPES registry on April 3, 2017.
Where is Hazel Abaya located?
Hazel Abaya practices at 2190 Lynn Rd Ste 300, Thousand Oaks, CA 91360. The listed phone number is (805) 370-4802.
What is Hazel Abaya's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Hazel Abaya enrolled in Medicare?
Yes. Hazel Abaya 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 Hazel Abaya's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Hazel Abaya reassigns Medicare benefits to 4 organizations: Advantage Hospitalists Inc. (Agoura Hills, CA), Chest And Critical Care Consultants A Medical Group (Whittier, CA), Inpatient Specialists Of California, PC (San Bernardino, CA) and Hospitalist Medicine Physicians Of California, Inc (Apple Valley, 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 Hazel Abaya'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 Hazel Abaya was last updated on March 18, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Hazel Abaya · NPI 1780116186
Internal Medicine physician in Thousand Oaks, California. Individual provider, active in the CMS NPPES registry since April 3, 2017.
## Identity
- **NPI:** 1780116186 (Entity type: Individual)
- **Enumerated:** April 3, 2017
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A169439 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2190 LYNN RD STE 300, Thousand Oaks, CA 91360-8024
- **Phone:** (805) 370-4802
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Advantage Hospitalists Inc. (NPI 1801269881, Agoura Hills, CA); Chest And Critical Care Consultants A Medical Group (NPI 1679787550, Whittier, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA); Hospitalist Medicine Physicians Of California, Inc (NPI 1184663965, Apple Valley, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** March 18, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1780116186) · Data from the CMS NPPES public registry.