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

Dr. Seng M Leong, MD

Individual provider Internal Medicine Physician · NPI 1487750790

Dr. Seng M Leong, MD is an Internal Medicine in Barrington, Illinois. Qualified in 1969, 57 years ago. Practices with Advocate Health and Hospitals Corporation, a 3,079-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
57
Licensed in
IL
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

27750 W Highway 22
Barrington, IL 60010-2379
Phone: (847) 381-5800
Fax: (847) 381-5873
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036-055809 (IL)

Record details

NPI number1487750790
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedSeptember 15, 2006
Last updated in NPPESMarch 31, 2025
Certification dateMarch 31, 2025
Mailing address29373 Network Pl, Chicago, IL 60673-1293

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1969 (57 years in practice)
Group practice Advocate Health And Hospitals Corporation — 3079 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations7 on file with Medicare

Other providers in Barrington