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STELA GEORGIEVA KOSTOVA-ABADJIEVA MD
NPI 1164791265
Internal Medicine in Tustin, CA

Active since December 19, 2011PECOS Enrolled
661 W 1ST ST STE G, TUSTIN, CA 92780(714) 665-9890(714) 665-9891 Get Directions Write a Review

NPPES record last updated: January 10, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Stela Georgieva Kostova-abadjieva Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

STELA GEORGIEVA KOSTOVA-ABADJIEVA MD (NPI 1164791265) is an individual internal medicine provider in Tustin, California, licensed in California (A121900) and active in the NPI registry since December 2011. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1164791265
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameSTELA GEORGIEVA KOSTOVA-ABADJIEVACredential: MD
Location Address661 W 1ST ST STE GTustin, CA 92780-2939
Mailing Address4310 Orange StRiverside, CA 92501-3829 · (951) 781-6335 · Fax (951) 781-6365
Phone(714) 665-9890
Fax(714) 665-9891
Sole ProprietorNo
Enumeration DateDecember 19, 2011
Last NPPES UpdateJanuary 10, 2023
NPPES CertifiedJanuary 10, 2023
✔ NPI 1164791265 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A121900
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
661 W 1ST ST STE G, Tustin, CA 92780
Open in Google Maps ↗

Secondary Practice Locations 2

Location 19918 Katella Ave Ste A-CAnaheim, CA 92804-6465 · Phone (714) 644-9494 · Fax (714) 644-9498
Location 211180 Warner Ave Ste 353Fountain Valley, CA 92708-7516 · Phone (714) 665-9890 ext. 446 · Fax (714) 665-9891

Other Identifiers 1

OtherA121900CA · Ca State License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stela Georgieva Kostova-abadjieva Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Stela Kostova-abadjieva reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Families Together Of Orange County
Same address
Clinic/Center
661 W 1ST ST, STE. G
Tustin, CA 92780
  • Reassigned Medicare billing, California enrollment
  • 86 clinicians in this Medicare group
NPI 1194122457 (714) 665-9890
Pioneer Medical Group Inc.
19 mi
Multi-Specialty
10251 ARTESIA BLVD
Bellflower, CA 90706
  • Reassigned Medicare billing, California enrollment
  • 45 clinicians in this Medicare group
NPI 1548303589 (562) 229-9452

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 92780 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

NICOLE ROLLE NOCHE NP
Nurse Practitioner (Women's Health)
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
CRYSTAL MARTIN PA
Physician Assistant
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
EILEEN MARTHA GOMEZ NP
Nurse Practitioner (Family)
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
DR. ROBERT J BORROWDALE M.D.
Obstetrics & Gynecology
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
MR. CARLOS GUERRERO PA-C
Physician Assistant
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
CHRISTINA VO FURUYA NP
Nurse Practitioner (Family)
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
FAMILIES TOGETHER OF ORANGE COUNTY
Clinic/Center (Primary Care)
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890
TODD NGUYEN NP
Nurse Practitioner
661 W 1ST ST STE G
TUSTIN, CA 92780
Orange County (714) 665-9890

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 Stela Kostova-abadjieva's NPI number?

The NPI number for Stela Kostova-abadjieva is 1164791265. It was assigned to this individual provider in the NPPES registry on December 19, 2011.

Where is Stela Kostova-abadjieva located?

Stela Kostova-abadjieva practices at 661 W 1st St Ste G, Tustin, CA 92780. The listed phone number is (714) 665-9890.

What is Stela Kostova-abadjieva's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Stela Kostova-abadjieva enrolled in Medicare?

Yes. Stela Kostova-abadjieva is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Stela Kostova-abadjieva's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stela Kostova-abadjieva reassigns Medicare benefits to 2 organizations: Families Together Of Orange County (Tustin, CA) and Pioneer Medical Group Inc. (Bellflower, 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 Stela Kostova-abadjieva'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 Stela Kostova-abadjieva was last updated on January 10, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.