Mark K. Buyyounouski, M.D.
NPI 1912927021ActiveIndividual· Radiology, Radiation Oncology· Stanford, CA
Radiology, Radiation Oncology (M.D.) in Stanford, California, trained at Rutgers New Jersey Medical School (class of 2000). 149 Medicare patients in 2024, $195,669 paid; all of their 80 Part D prescriptions were generic.
Overview
| NPI | 1912927021 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 20, 2006 |
| Last updated in NPPES | Apr 1, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | C55796 | CA |
| Specialist | 174400000X | MD4211507 | PA |
| Radiology, Radiation Oncology | 2085R0001X | MD421507 | PA |
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 - Radiation Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 149 |
|---|---|
| Services billed | 1,586 across 25 procedure codes |
| Paid by Medicare | $195,669 |
Part D prescriptions in 2024
| Prescriptions (claims) | 80 · 103 30-day fills |
|---|---|
| Patients | 30 |
| Total drug cost | $620.99 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Rutgers New Jersey Medical School |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Radiation Oncology |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliations
- Stanford Health CareStanford, CA
- Stanford Health Care Tri-ValleyPleasanton, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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