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

William Mark Roberts, MD

Individual provider Pediatric Hematology & Oncology Physician · NPI 1790873578

William Mark Roberts, MD is a Pediatric Hematology & Oncology Physician in Orange, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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

455 S Main St
Orange, CA 92868-3835
Phone: (714) 532-8636
Fax: (714) 532-8699
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Hematology & Oncology Physician (primary) Taxonomy 2080P0207X · Licence G85878 (CA)

Record details

NPI number1790873578
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 10, 2006
Last updated in NPPESJuly 8, 2007
Mailing address455 S Main St, Orange, CA 92868-3835

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