DR. AMY ANN STEWART MD
NPI 1255582896
Internal Medicine - Critical Care Medicine in Oak Lawn, IL
About Dr. Amy Ann Stewart Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. AMY ANN STEWART MD (NPI 1255582896) is an individual critical care medicine provider in Oak Lawn, Illinois, licensed in Illinois (036.135687) and active in the NPI registry since October 2008. She is enrolled in Medicare PECOS, is affiliated with Advocate Sherman Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 4
Secondary Practice Locations 2
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
Dr. Amy Ann Stewart 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
2Medicare enrollment records show Amy Stewart reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Also billed through NPI 1629441027 (Illinois)
- 4,870 clinicians in this Medicare group
Milwaukee, WI 53215
- Reassigned Medicare billing, Wisconsin enrollment
- 4,609 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 4
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.
Advocate Sherman Hospital
Acute Care Hospitals · Elgin, ILAdvocate Lutheran General Hospital
Acute Care Hospitals · Park Ridge, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60453 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.
OAK LAWN, IL 60453
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 Amy Stewart's NPI number?
The NPI number for Amy Stewart is 1255582896. It was assigned to this individual provider in the NPPES registry on October 1, 2008.
Where is Amy Stewart located?
Amy Stewart practices at 9555 S 52nd Ave, Oak Lawn, IL 60453. The listed phone number is (708) 634-0950.
What is Amy Stewart's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Amy Stewart enrolled in Medicare?
Yes. Amy Stewart 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 Amy Stewart's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Amy Stewart reassigns Medicare benefits to 2 organizations: Advocate Health And Hospitals Corporation (Oak Lawn, IL) and Aurora Medical Group, Inc. (Milwaukee, WI). 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 Amy Stewart's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Amy Stewart accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Amy Stewart 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 Amy Stewart affiliated with any hospitals?
According to CMS data, Amy Stewart is affiliated with Advocate Sherman Hospital and Advocate Lutheran General Hospital.
When was this NPI record last updated?
The NPPES record for Amy Stewart was last updated on May 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Dr. Amy Ann Stewart, MD · NPI 1255582896
Critical Care Medicine physician in Oak Lawn, Illinois. Individual provider, active in the CMS NPPES registry since October 1, 2008.
## Identity
- **NPI:** 1255582896 (Entity type: Individual)
- **Enumerated:** October 1, 2008
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 036.135687 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 9555 S 52ND AVE, Oak Lawn, IL 60453-3054
- **Phone:** (708) 634-0950
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Advocate Health And Hospitals Corporation (NPI 1174747075, Oak Lawn, IL); Aurora Medical Group, Inc. (NPI 1427271378, Milwaukee, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical Branch At Galveston, class of 2008
## Record status
- **NPPES last updated:** May 22, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1255582896) · Data from the CMS NPPES public registry.