WALTER A ROSSI MD
NPI 1225731433
Internal Medicine in Chicago, IL
About Walter A Rossi Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WALTER A ROSSI MD (NPI 1225731433) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (125.081947) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS, is affiliated with Northwestern Memorial Hospital, and maintains a secondary practice location in Chicago.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
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
Walter A Rossi 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 Reassignment
Medicare enrollment records show Walter Rossi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Memorial Hospital
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60611 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.
CHICAGO, IL 60611
CHICAGO, IL 60611
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 Walter Rossi's NPI number?
The NPI number for Walter Rossi is 1225731433. It was assigned to this individual provider in the NPPES registry on March 24, 2023.
Where is Walter Rossi located?
Walter Rossi practices at 251 E Huron St, Chicago, IL 60611. The listed phone number is (312) 926-2000.
What is Walter Rossi's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Walter Rossi enrolled in Medicare?
Yes. Walter Rossi 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 organization bills Medicare for Walter Rossi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Walter Rossi reassigns Medicare benefits to Northwestern Medical Faculty Foundation (Carol Stream, IL). The 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 Walter Rossi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Walter Rossi affiliated with any hospitals?
According to CMS data, Walter Rossi is affiliated with Northwestern Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Walter Rossi was last updated on June 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Walter A Rossi, MD · NPI 1225731433
Internal Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since March 24, 2023.
## Identity
- **NPI:** 1225731433 (Entity type: Individual)
- **Enumerated:** March 24, 2023
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 125.081947 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 251 E HURON ST, Chicago, IL 60611-3055
- **Phone:** (312) 926-2000
## 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:** Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** June 8, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1225731433) · Data from the CMS NPPES public registry.