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

Individual provider Internal Medicine Physician · NPI 1326056136

Dr. Gerald Jay Osher, MD is an Internal Medicine in Bannockburn, Illinois. Graduated from University of Michigan Medical School in 1980, 46 years ago. Practices with Brent M Nathan MD PLLC, a 4-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
46
Trained at
University of Michigan Medical School
Licensed in
IL
In the registry since
2006
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

2101 Waukegan Rd Ste 200
Bannockburn, IL 60015-1800
Phone: (847) 317-1717
Fax: (847) 317-9305
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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 · Licence 036066116 (IL)

Record details

NPI number1326056136
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 4, 2006
Last updated in NPPESDecember 19, 2025
Certification dateDecember 19, 2025
Mailing address2101 Waukegan Rd Ste 200, Bannockburn, IL 60015-1800

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1980 (46 years in practice)
Group practice Brent M Nathan Md Pllc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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