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

Dr. John Wesley Patresan, MD

Individual provider Hematology & Oncology Physician · NPI 1023644978

Dr. John Wesley Patresan, MD is a Hematology/Oncology in Martinez, California. Qualified in 2020, 6 years ago. Licensed in California.

Years since qualifying
6
Licensed in
CA
In the registry since
2020
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

2500 Alhambra Ave
Martinez, CA 94553-3156
Phone: (925) 370-5000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence A205802 (CA)

Record details

NPI number1023644978
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 22, 2020
Last updated in NPPESAugust 8, 2026
Certification dateAugust 8, 2026

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Accepts Medicare assignment Not indicated

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