HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CA

WILLIAM M GREIF, MD

GENERAL SURGERY

Medical school: STANFORD UNIVERSITY SCHOOL OF MEDICINE

Graduated: 1993

Also: SURGICAL ONCOLOGY, THORACIC SURGERY, VASCULAR SURGERY

NPI: 1013095108

Practice Locations (3)

PERMANENTE MEDICAL GROUP INC

4501 SAND CREEK RD

ANTIOCH, CA 945318687

9258136500

PERMANENTE MEDICAL GROUP INC

901 NEVIN AVE

RICHMOND, CA 948013143

5103071500

PERMANENTE MEDICAL GROUP INC

1425 S MAIN ST

WALNUT CREEK, CA 945965318

9252954000

Source: CMS National Downloadable File, September 2026.

WILLIAM GREIF, MD | HealthCareAtlasUSA