Croix Fossum, M.D.
NPI 1104351006ActiveIndividual· Radiology, Radiation Oncology· San Diego, CA
Radiology, Radiation Oncology (M.D.) in San Diego, California, trained at Mayo Medical School (class of 2017). 183 Medicare patients in 2024, $113,630 paid; nearly all of their 116 Part D prescriptions were generic (94%). Merck Sharp & Dohme LLC was the largest of 22 companies reporting payments in 2025, $729.12 in all, mostly food and beverage.
Overview
| NPI | 1104351006 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 28, 2017 |
| Last updated in NPPES | Feb 18, 2026 |
| Certified by provider | Feb 18, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | A159160 | CA |
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 | 183 |
|---|---|
| Services billed | 1,554 across 30 procedure codes |
| Paid by Medicare | $113,630 |
Part D prescriptions in 2024
| Prescriptions (claims) | 116 · 135 30-day fills |
|---|---|
| Patients | 35 |
| Total drug cost | $2,605 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Mayo Medical School |
|---|---|
| Graduation year | 2017 |
| Medicare specialty | Radiation Oncology |
Medical group
- X-Ray Medical Group Radiation Oncology IncChula Vista, CA · 8 clinicians
Hospital affiliations
- Grossmont HospitalLa Mesa, CA
- Sharp Coronado Hospital and Hlthcr CtrCoronado, CA
- Sharp Memorial HospitalSan Diego, CA
- Uc San Diego Health Hillcrest - Hillcrest Med CtrSan Diego, CA
Industry payments (Open Payments)
- 2025$729.12 · 29 payments from 22 companies
- 2024$695.39 · 21 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $87.02 | 3 |
| Incyte Corporation | $63.18 | 3 |
| Janssen Biotech, Inc. | $56.76 | 2 |
| Genzyme Corporation | $52.27 | 2 |
| Puma Biotechnology, Inc. | $41.41 | 2 |
What the 2025 payments were for
- Food and Beverage$729.12 · 29 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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