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 F JOHNSTON, MD

EMERGENCY MEDICINE

Graduated: 2013

NPI: 1417366584

Practice Locations (1)

CEP AMERICA - CALIFORNIA

222 W 39TH AVE

SAN MATEO, CA 944034364

6505732222

Source: CMS National Downloadable File, September 2026.

WILLIAM JOHNSTON, MD | HealthCareAtlasUSA