Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Croix Fossum, MD

Individual provider Radiation Oncology Physician · NPI 1104351006

Croix Fossum, MD is a Radiation Oncology in San Diego, California. Graduated from Mayo Medical School in 2017, 9 years ago. Practices with X-Ray Medical Group Radiation Oncology Inc, an 8-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
9
Trained at
Mayo Medical School
Licensed in
CA
In the registry since
2017
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

7901 Frost St
San Diego, CA 92123-2701
Phone: (858) 939-5010
Fax: (858) 939-5021
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 769 Medical Center Ct, Chula Vista, CA 91911-6602 — (619) 502-5851
  • 5555 Grossmont Center Dr, La Mesa, CA 91942-3019 — (619) 740-4500

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence A159160 (CA)

Record details

NPI number1104351006
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 28, 2017
Last updated in NPPESFebruary 18, 2026
Certification dateFebruary 18, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolMAYO MEDICAL SCHOOL
Graduated 2017 (9 years in practice)
Group practice X-Ray Medical Group Radiation Oncology Inc — 8 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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