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

Dr. Alejandro Yu Ong, MD

Individual provider Internal Medicine Physician · NPI 1326174863

Dr. Alejandro Yu Ong, MD is an Internal Medicine Physician in Elgin, Illinois. Practices as a sole proprietor. Licensed in Illinois.

Licensed in
IL
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

750 S State St
Elgin, IL 60123-7612
Phone: (847) 742-1040
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X (IL)

Record details

NPI number1326174863
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 27, 2007
Last updated in NPPESJuly 8, 2007
Mailing address2316 Castilian Cir, Northbrook, IL 60062-7615

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