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

Gary Gruber, MD

Individual provider Internal Medicine Physician · NPI 1487693610

Gary Gruber, MD practises Internal Medicine in Chicago, Illinois. Graduated from Icahn School of Medicine at Mount Sinai in 1984, 42 years ago. Practices with Northwestern Medical Faculty Foundation, a 4,394-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
42
Trained at
Icahn School of Medicine at Mount Sinai
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

676 N Saint Clair St Ste 415
Chicago, IL 60611-2927 Not confirmed with CMS for 12 years — call before visiting
Phone: (312) 926-6146
Fax: (312) 926-4398
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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 036071700 (IL)

Record details

NPI number1487693610
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 5, 2006
Last updated in NPPESAugust 22, 2014

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 1984 (42 years in practice)
Group practice Northwestern Medical Faculty Foundation — 4394 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations20 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients429
Services billed 2,019 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Northwestern Medical Faculty Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4394 clinicians in the practice; 12 are shown here.

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