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

MARY ANN H TREPHAN, MD

EMERGENCY MEDICINE

Medical school: JEFFERSON MEDICAL COLLEGE OF THOMAS JEFFERSON UNIVERSITY

Graduated: 1993

NPI: 1891752614

Practice Locations (2)

SOUTHERN CALIFORNIA PERMANENTE MEDICAL GROUP

4949 MARKET ST

VENTURA, CA 930037851

8776080044

SOUTHERN CALIFORNIA PERMANENTE MEDICAL GROUP

888 S HILL RD

VENTURA, CA 930038400

8054776400

Source: CMS National Downloadable File, September 2026.

MARY ANN TREPHAN, MD | HealthCareAtlasUSA