Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mr. John W Riordan, MD

Individual provider Specialist · NPI 1619040227

Mr. John W Riordan, MD is a Nephrology in San Francisco, California. Graduated from University of Texas Medical Branch at Galveston in 1987, 39 years ago. Practices with Renal Medical Associates, a 6-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
39
Trained at
University of Texas Medical Branch at Galveston
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

2100 Webster St Ste 320
San Francisco, CA 94115-2377
Phone: (415) 923-3815
Fax: (415) 749-5713
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Specialist (primary) Taxonomy 174400000X · Licence A52155 (CA)

Record details

NPI number1619040227
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 15, 2006
Last updated in NPPESJuly 29, 2022
Certification dateJuly 29, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEPHROLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1987 (39 years in practice)
Group practice Renal Medical Associates — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in San Francisco