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

SEAN S TO, MD

INTERNAL MEDICINE

Medical school: R FRANKLIN UNIVERSITY OF MED & SCI/CHICAGO MEDICAL SCHOOL

Graduated: 1998

Offers telehealth

NPI: 1922163310

Practice Locations (2)

5562 PHILADELPHIA ST, SUITE 201

CHINO, CA 917102482

9099881000

8283 GROVE AVE, SUITE 201

RANCHO CUCAMONGA, CA 917303140

9099816644

Source: CMS National Downloadable File, September 2026.

SEAN TO, MD | HealthCareAtlasUSA