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

Dr. Diana Hess, MD

Individual provider Internal Medicine Physician · NPI 1295296275

Dr. Diana Hess, MD is an Internal Medicine in Castro Valley, California. Graduated from Univ of Central Florida, College of Medicine in 2019, 7 years ago. Practices with Sutter Bay Medical Foundation, a 3,762-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
7
Trained at
Univ of Central Florida, College of Medicine
Licensed in
CA
In the registry since
2019
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

20101 Lake Chabot Rd Fl 3
Castro Valley, CA 94546-5305
Phone: (510) 886-3400
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 101 The City Dr S Ste 400, Orange, CA 92868-3201 — (714) 456-5691
  • 1451 Irvine Blvd, Tustin, CA 92780-3804 — (714) 838-8878

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 178427 (CA)

Record details

NPI number1295296275
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 30, 2019
Last updated in NPPESOctober 30, 2024
Certification dateOctober 30, 2024

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIV OF CENTRAL FLORIDA, COLLEGE OF MEDICINE
Graduated 2019 (7 years in practice)
Group practice Sutter Bay Medical Foundation — 3762 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

Other providers in Castro Valley