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

RONALD A. SPIER, DO

HOSPITALIST

Graduated: 2009

Also: INTERNAL MEDICINE

NPI: 1124261631

Practice Locations (1)

SOUTHERN CALIFORNIA PERMANENTE MEDICAL GROUP

9961 SIERRA AVE

FONTANA, CA 923356720

9094275000

Source: CMS National Downloadable File, September 2026.

RONALD SPIER, DO | HealthCareAtlasUSA