Quick answers
- Which hospitals does Flavia E. Kostov work at?
- Medicare's official clinician data lists Flavia E. Kostov at 4 hospitals: Riverside Doctors' Hospital of Williamsburg, Riverside Regional Medical Center, Riverside Walter Reed Hospital and Sentara Careplex Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Flavia E. Kostov see patients?
- Medicare's clinician data lists 2 practice locations, including Williamsburg, VA and Newport News, VA. Call before your visit to confirm the address.
- What is Flavia E. Kostov's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Flavia E. Kostov accept Medicare assignment?
- Yes. Medicare's clinician data says Flavia E. Kostov accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Flavia E. Kostov?
- (757) 345-5724, as listed in official Medicare / NPI Registry data.
- What is Flavia E. Kostov's NPI number?
- 1174545107. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Flavia E. Kostov works
Medicare's Facility Affiliation Data lists Flavia E. Kostov at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Riverside Doctors' Hospital of WilliamsburgWilliamsburg, VA · Acute Care Hospital · CCN 490143
- Riverside Regional Medical CenterNewport News, VA · Acute Care Hospital · CCN 490052
- Riverside Walter Reed HospitalGloucester, VA · Acute Care Hospital · CCN 490130
- Sentara Careplex HospitalHampton, VA · Acute Care Hospital · CCN 490093
Practice locations
Addresses where Flavia E. Kostov is enrolled with Medicare (CMS data updated 2026-10-02).
- 120 Kings Way, Suite 3100Williamsburg, VA 23185 (757) 345‑5724
- 12100 Warwick Blvd, Suite 201Newport News, VA 23601 (757) 534‑5555
Group practices
Medicare enrollment lists Flavia E. Kostov as a member of this group (CMS data updated 2026-10-02).
- Peninsula Cancer Institute, LLC31 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Williamsburg
Clinicians with the same Medicare primary specialty in Williamsburg, VA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2001 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1174545107 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians