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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ALEXANDER NIAZI SIDHOM MD
NPI 1003444001
Allergy & Immunology in Redwood City, CA

Active since March 27, 2020
570 PRICE AVE STE 400, REDWOOD CITY, CA 94063(650) 466-6224(650) 466-6219 Get Directions Write a Review

NPPES record last updated: October 20, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Alexander Niazi Sidhom Md NPPES

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

ALEXANDER NIAZI SIDHOM MD (NPI 1003444001) is an individual allergy & immunology provider in Redwood City, California, licensed in California (A185761) and active in the NPI registry since March 2020. He maintains a secondary practice location in Fresno.

NPPES Registry Identity

NPI1003444001
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameALEXANDER NIAZI SIDHOMCredential: MD
Location Address570 PRICE AVE STE 400Redwood City, CA 94063-1452
Mailing Address155 N Fresno StFresno, CA 93701-2302 · (559) 499-6556
Phone(650) 466-6224
Fax(650) 466-6219
Sole ProprietorNo
Enumeration DateMarch 27, 2020
Last NPPES UpdateOctober 20, 2026
NPPES CertifiedOctober 20, 2026
✔ NPI 1003444001 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in CA · A185761
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
Also ListedPediatricsTaxonomy 208000000X · License A185761 (CA)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
570 PRICE AVE STE 400, Redwood City, CA 94063
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Secondary Practice Location 1

Location 1155 N Fresno StFresno, CA 93701-2302 · Phone (559) 499-6556

Other Providers at the Same Location NPPES 3

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

FORTRA MEDICAL GROUP OF CALIFORNIA, PC
Allergy & Immunology (Allergy)
570 PRICE AVE STE 400
REDWOOD CITY, CA 94063
San Mateo County (650) 466-6364
ALLISON ANDERSON PNP
Nurse Practitioner (Pediatrics)
570 PRICE AVE STE 400
REDWOOD CITY, CA 94063
San Mateo County (650) 466-6224
SUZANNE MARIE HENDERSON MD
Allergy & Immunology
570 PRICE AVE STE 400
REDWOOD CITY, CA 94063
San Mateo County (650) 466-6224

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 Alexander Sidhom's NPI number?

The NPI number for Alexander Sidhom is 1003444001. It was assigned to this individual provider in the NPPES registry on March 27, 2020.

Where is Alexander Sidhom located?

Alexander Sidhom practices at 570 Price Ave Ste 400, Redwood City, CA 94063. The listed phone number is (650) 466-6224.

What is Alexander Sidhom's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

When was this NPI record last updated?

The NPPES record for Alexander Sidhom was last updated on October 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 days 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.