MARGARET ZIELINSKI M.D.
NPI 1326467598
Emergency Medicine in Chicago, IL
About Margaret Zielinski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET ZIELINSKI M.D. (NPI 1326467598) is an individual emergency medicine provider in Chicago, Illinois, licensed in Illinois (036.142365) and active in the NPI registry since April 2014. She is enrolled in Medicare PECOS, is affiliated with Montefiore Medical Center, and maintains a secondary practice location in Staten Island.
NPPES Registry Identity
Specialties & Licenses
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
Margaret Zielinski 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.
Medicare Billing Reassignments
3Medicare enrollment records show Margaret Zielinski reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10025
- Reassigned Medicare billing, New York enrollment
- 5,251 clinicians in this Medicare group
Bronx, NY 10461
- Reassigned Medicare billing, New York enrollment
- 244 clinicians in this Medicare group
White Plains, NY 10601
- Reassigned Medicare billing, New York enrollment
- 479 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 3
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Montefiore Medical Center
Acute Care Hospitals · Bronx, NYMontefiore Mount Vernon Hospital
Acute Care Hospitals · Mount Vernon, NYMontefiore New Rochelle Hospital
Acute Care Hospitals · New Rochelle, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60617 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 60617
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 Margaret Zielinski's NPI number?
The NPI number for Margaret Zielinski is 1326467598. It was assigned to this individual provider in the NPPES registry on April 15, 2014.
Where is Margaret Zielinski located?
Margaret Zielinski practices at 2320 E 93rd St, Chicago, IL 60617. The listed phone number is (773) 967-2000.
What is Margaret Zielinski's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Margaret Zielinski enrolled in Medicare?
Yes. Margaret Zielinski 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 Margaret Zielinski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Zielinski reassigns Medicare benefits to 3 organizations: Montefiore Medical Center (New York, NY), Hospitalist Medicine Physicians Of New York, PLLC (Bronx, NY) and East Post Road Medical Services PC (White Plains, NY). 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 Margaret Zielinski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Margaret Zielinski affiliated with any hospitals?
According to CMS data, Margaret Zielinski is affiliated with Montefiore Medical Center, Montefiore Mount Vernon Hospital and Montefiore New Rochelle Hospital.
When was this NPI record last updated?
The NPPES record for Margaret Zielinski was last updated on March 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Margaret Zielinski, M.D. · NPI 1326467598
Emergency Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since April 15, 2014.
## Identity
- **NPI:** 1326467598 (Entity type: Individual)
- **Enumerated:** April 15, 2014
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 036.142365 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2320 E 93RD ST, Chicago, IL 60617-3909
- **Phone:** (773) 967-2000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Montefiore Medical Center (NPI 1760288278, New York, NY); Hospitalist Medicine Physicians Of New York, PLLC (NPI 1205944329, Bronx, NY); East Post Road Medical Services PC (NPI 1841767274, White Plains, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 2014
## Record status
- **NPPES last updated:** March 17, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1326467598) · Data from the CMS NPPES public registry.