JOHN W. RIORDAN, MD
NPI 1124217443
Specialist in San Francisco, CA

Q: What is John W. Riordan, MD's NPI number?

The NPI number for John W. Riordan, MD is 1124217443. It was assigned to this organization in the NPPES registry on October 23, 2007.

Q: What is John W. Riordan, MD's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Active since October 23, 2007

2100 WEBSTER ST, STE 412, SAN FRANCISCO, CA 94115(415) 923-3815(415) 749-5713 Get Directions Write a Review

NPPES record last updated: October 23, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About John W. Riordan, Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN W. RIORDAN, MD (NPI 1124217443) is a healthcare organization registered as a specialist in San Francisco, California and active in the NPI registry since October 2007. The organization lists John William Riordan, Md, as its authorized official.

NPPES Registry Identity

NPI1124217443

Entity TypeOrganization

Primary Taxonomy174400000X

Legal Business NameJOHN W. RIORDAN, MD

Location Address2100 WEBSTER ST, STE 412San Francisco, CA 94115-2373

Mailing Address2100 Webster St, Ste 412San Francisco, CA 94115-2373 · (415) 923-3815 · Fax (415) 749-5713

Phone(415) 923-3815

Fax(415) 749-5713

Organization SubpartNo

Authorized OfficialJohn William RiordanMd · (415) 923-3815

Enumeration DateOctober 23, 2007

✔ NPI 1124217443 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in CA · A052155

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

2100 WEBSTER ST, San Francisco, CA 94115

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Other Identifiers 4

OtherA052155CA · License Number

Medicare PINZZZ459972ZCA

MedicaidGR0068330CA

Medicare UPINF78574CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JACK C ROSE

Psychiatry & Neurology (Neurology)

2100 WEBSTER ST, 4TH FLOOR
SAN FRANCISCO, CA 94115

San Francisco County (415) 600-5760

RUSSELL D WOO M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery)

2100 WEBSTER ST
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3004

DR. STAFFORD J DUHN DDS

Dentist (General Practice)

2100 WEBSTER ST, SUITE 325
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3034

DR. RICKI POLLYCOVE M.D., M.H.S.

Obstetrics & Gynecology (Gynecology)

2100 WEBSTER ST, STE. 508
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3390

OLGA HIDCHENKO NP

Clinical Nurse Specialist (Women's Health)

2100 WEBSTER ST, SUITE 319
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3123

DR. DAVID R MINOR MD

Internal Medicine (Medical Oncology)

2100 WEBSTER ST, #326
SAN FRANCISCO, CA 94115

San Francisco County (415) 885-8600

DR. PEDRO JOSE RUIZ M.D., PH.D.

Internal Medicine (Rheumatology)

2100 WEBSTER ST, SUITE 112
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3060

JONATHAN KAPLAN MD INC

Plastic Surgery

2100 WEBSTER ST, SUITE 429
SAN FRANCISCO, CA 94115

San Francisco County (415) 923-3005

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John W. Riordan, MD's NPI number?

The NPI number for John W. Riordan, MD is 1124217443. It was assigned to this organization in the NPPES registry on October 23, 2007.

Where is John W. Riordan, MD located?

John W. Riordan, MD is located at 2100 Webster St Ste 412, San Francisco, CA 94115. The listed phone number is (415) 923-3815.

What is John W. Riordan, MD's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

When was this NPI record last updated?

The NPPES record for John W. Riordan, MD was last updated on October 23, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.