Arash Rezazadeh Kalebasty, M.D.
NPI 1205974755ActiveIndividual· Internal Medicine, Hematology & Oncology· Orange, CA
Internal Medicine, Hematology & Oncology (M.D.) with Uc Regents, practicing in Orange, California. Their prescriptions cost Medicare Part D more than their services did: $7,072,770 for 1,431 claims, against $153,910 paid for services in 2024. Exelixis Inc. was the largest of 9 companies reporting payments in 2025, $69,977 in all, mostly speaking and faculty fees. Lists Hoag Memorial Hospital Presbyterian and 1 other hospital as hospital affiliations.
Overview
| NPI | 1205974755 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 4, 2007 |
| Last updated in NPPES | Apr 14, 2023 |
| Certified by provider | Apr 14, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | C167307 | CA |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 40927 | KY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 247 |
|---|---|
| Services billed | 2,157 across 6 procedure codes |
| Paid by Medicare | $153,910 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,431 · 1,579 30-day fills |
|---|---|
| Patients | 150 |
| Total drug cost | $7,072,770 |
| Generic share | 49% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- Uc RegentsOrange, CA · 319 clinicians
Hospital affiliations
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$69,977 · 63 payments from 9 companies
- 2024$78,521 · 81 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exelixis Inc. | $20,386 | 22 |
| Bayer Healthcare Pharmaceuticals Inc. | $19,014 | 10 |
| Merck Sharp & Dohme LLC | $13,183 | 7 |
| Janssen Biotech, Inc. | $12,921 | 15 |
| Novartis Pharmaceuticals Corporation | $2,100 | 2 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$39,366 · 14 payments
- Compensation for serving as faculty or as a speaker for a medical education program$16,005 · 5 payments
- Consulting Fee$7,223 · 5 payments
- Travel and Lodging$5,872 · 22 payments
- Food and Beverage$1,492 · 16 payments
- Entertainment$19.02 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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