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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. JOANNE IHM KOO MD
NPI 1215983580
Internal Medicine in Pomona, CA

Active since May 26, 2006
3530 WEST POMONA BLVD, POMONA, CA 91769(909) 595-1221(909) 598-4352 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Joanne Ihm Koo Md NPPES

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

DR. JOANNE IHM KOO MD (NPI 1215983580) is an individual internal medicine provider in Pomona, California, licensed in California (A36581) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1215983580
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. JOANNE IHM KOOCredential: MD
Location Address3530 WEST POMONA BLVDPomona, CA 91769-0100
Mailing Address1600 9th Street, Room 205 Mailstop 2-3Sacramento, CA 95814-6414 · (916) 654-2431 · Fax (916) 654-3186
Phone(909) 595-1221
Fax(909) 598-4352
Sole ProprietorNo
Enumeration DateMay 26, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1215983580 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A36581
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
3530 WEST POMONA BLVD, Pomona, CA 91769
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Other Identifiers 1

OtherA365810CA · Pin

Other Providers at the Same Location NPPES 12

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

DR. GREGORY PAUL STONE DDS
Dentist
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. DAVID A SMITH PHD
Psychologist (Clinical)
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
BA NGOC TRAN MD
Pediatrics
3530 WEST POMONA BLVD
PONOMA, CA 91769
Los Angeles County (909) 595-1221
ELHAMY FAWZY KHALIL MD
Pediatrics
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
CUONG HUU NGHIEM MD
General Practice
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. YIEN-NAN WANG DDS
Dentist
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
DR. CAROL LYNN GANDOLFO PSY D
Psychologist (Intellectual and Developmental Disabilities)
3530 WEST POMONA BLVD
POMONA, CA 91769
Los Angeles County (909) 595-1221
NIT WICHENKUER MD
General Practice
3530 WEST POMONA BLVD
PONOMA, CA 91769
Los Angeles County (909) 595-1221

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 Joanne Koo's NPI number?

The NPI number for Joanne Koo is 1215983580. It was assigned to this individual provider in the NPPES registry on May 26, 2006.

Where is Joanne Koo located?

Joanne Koo practices at 3530 West Pomona Blvd, Pomona, CA 91769. The listed phone number is (909) 595-1221.

What is Joanne Koo's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Joanne Koo was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 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.