GARY ALTWERGER M.D.
NPI 1407114630
Obstetrics & Gynecology - Gynecologic Oncology in Chicago, IL
About Gary Altwerger M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GARY ALTWERGER M.D. (NPI 1407114630) is an individual gynecologic oncology provider in Chicago, Illinois, licensed in Illinois (036176993) and active in the NPI registry since April 2012. He is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Gary Altwerger M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
The University Of Chicago Medical Center
Acute Care Hospitals · Chicago, ILUchicago Medicine Adventhealth Bolingbrook
Acute Care Hospitals · Bolingbrook, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60637 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHICAGO, IL 60637
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gary Altwerger's NPI number?
The NPI number for Gary Altwerger is 1407114630. It was assigned to this individual provider in the NPPES registry on April 25, 2012.
Where is Gary Altwerger located?
Gary Altwerger practices at 5841 S Maryland Ave, Chicago, IL 60637. The listed phone number is (888) 824-0200.
What is Gary Altwerger's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Gynecologic Oncology, with taxonomy code 207VX0201X.
Is Gary Altwerger enrolled in Medicare?
Yes. Gary Altwerger is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is Gary Altwerger affiliated with any hospitals?
According to CMS data, Gary Altwerger is affiliated with The University Of Chicago Medical Center and Uchicago Medicine Adventhealth Bolingbrook.
When was this NPI record last updated?
The NPPES record for Gary Altwerger was last updated on January 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
