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

JOHN W RIORDAN, MD

NEPHROLOGY

Medical school: UNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON

Graduated: 1987

Offers telehealth

NPI: 1619040227

Practice Locations (1)

RENAL MEDICAL ASSOCIATES

2100 WEBSTER ST, SUITE 320

SAN FRANCISCO, CA 941152377

4159233456

Source: CMS National Downloadable File, September 2026.

JOHN RIORDAN, MD | HealthCareAtlasUSA