Joanne Ihm Koo, MD
Internal Medicine Physician · Pomona, CA
Joanne Ihm Koo, MD is an internal medicine physician with a practice address in Pomona, California, and NPI 1215983580, issued on May 26, 2006. Check the license (California A36581, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Joanne Ihm Koo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A36581 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3530 West Pomona Blvd, Pomona, CA 91769
- Phone
- (909) 595-1221
- Enumerated
- May 26, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (909) 598-4352
- Entity
- Type 1 · individual
Also registered at 3530 West Pomona Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joanne Ihm Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A36581Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37 internal medicine physician records list a practice address in Pomona
They are 37 of the 5,102 NPPES records with a practice address in Pomona, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 37 in Pomona → All 17,696 in California → Every provider in Pomona →
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Common questions
What is Joanne Ihm Koo, MD's NPI number?
Joanne Ihm Koo, MD's National Provider Identifier (NPI) is 1215983580, issued on May 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joanne Ihm Koo, MD located?
The NPPES record lists a practice address at 3530 West Pomona Blvd, Pomona, CA, 91769. Phone: (909) 595-1221. Providers update this record themselves, so call before visiting.
How can I verify Joanne Ihm Koo, MD's license?
NPPES lists California license number A36581, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.