THEODORE LYONS STERN MD
NPI 1043202567
Family Medicine in Westmont, IL
About Theodore Lyons Stern Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THEODORE LYONS STERN MD (NPI 1043202567) is an individual family medicine provider in Westmont, Illinois, licensed in Illinois (036-108619) and active in the NPI registry since August 2005. 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 2
Secondary Practice Locations 2
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Theodore Lyons Stern Md 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.
Medicare Billing Reassignments
6Medicare enrollment records show Theodore Stern reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Downers Grove, IL 60515
- Reassigned Medicare billing, Illinois enrollment
- 1,061 clinicians in this Medicare group
Maywood, IL 60153
- Reassigned Medicare billing, Illinois enrollment
- 1,138 clinicians in this Medicare group
Chicago, IL 60605
- Reassigned Medicare billing, Illinois enrollment
- 150 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Portage, IN 46368
- Reassigned Medicare billing, Indiana enrollment
- 177 clinicians in this Medicare group
Valparaiso, IN 46383
- Reassigned Medicare billing, Indiana enrollment
- 153 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
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
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, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60559 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 Theodore Stern's NPI number?
The NPI number for Theodore Stern is 1043202567. It was assigned to this individual provider in the NPPES registry on August 19, 2005.
Where is Theodore Stern located?
Theodore Stern practices at 303 W Ogden Ave, Westmont, IL 60559. The listed phone number is (630) 432-6200.
What is Theodore Stern's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Theodore Stern enrolled in Medicare?
Yes. Theodore Stern 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.
Which organizations bill Medicare for Theodore Stern's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theodore Stern reassigns Medicare benefits to 6 organizations: Dupage Medical Group Ltd (Downers Grove, IL), Loyola University Medical Center (Maywood, IL), University Of Chicago (Chicago, IL), Northwestern Medical Faculty Foundation (Carol Stream, IL), Porter Physician Services LLC (Portage, IN) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Theodore Stern's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Theodore Stern accept?
Health plans from CareSource and Oscar Health list Theodore Stern as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Theodore Stern affiliated with any hospitals?
According to CMS data, Theodore Stern is affiliated with The University Of Chicago Medical Center.
When was this NPI record last updated?
The NPPES record for Theodore Stern was last updated on September 23, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# Theodore Lyons Stern, MD · NPI 1043202567
Family Medicine physician in Westmont, Illinois. Individual provider, active in the CMS NPPES registry since August 19, 2005.
## Identity
- **NPI:** 1043202567 (Entity type: Individual)
- **Enumerated:** August 19, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 036-108619 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 303 W OGDEN AVE, Westmont, IL 60559-1419
- **Phone:** (630) 432-6200 · **Fax:** (630) 432-6660
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Dupage Medical Group Ltd (NPI 1801833983, Downers Grove, IL); Loyola University Medical Center (NPI 1336159961, Maywood, IL); University Of Chicago (NPI 1477262046, Chicago, IL); Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); Porter Physician Services LLC (NPI 1457566309, Portage, IN); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 1998
## Record status
- **NPPES last updated:** September 23, 2022
- **Other identifiers:** Other 90001358 (IL); Medicaid 200501020 (IN); Medicaid 036108619 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1043202567) · Data from the CMS NPPES public registry.