SARA HELEN HAMMER DO
NPI 1144858457
Family Medicine in Chicago, IL
About Sara Helen Hammer Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SARA HELEN HAMMER DO (NPI 1144858457) is an individual family medicine provider in Chicago, Illinois, licensed in Illinois (036-164028) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS, is affiliated with Advocate Illinois Masonic Medical Center, and maintains a secondary practice location in Chicago.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Sara Helen Hammer Do 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 Sara Hammer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chicago, IL 60657
- Reassigned Medicare billing, Illinois enrollment
- 4,870 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 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Advocate Illinois Masonic Medical Center
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60641 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 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHICAGO, IL 60641
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 Sara Hammer's NPI number?
The NPI number for Sara Hammer is 1144858457. It was assigned to this individual provider in the NPPES registry on March 31, 2020.
Where is Sara Hammer located?
Sara Hammer practices at 3936 N Milwaukee Ave, Chicago, IL 60641. The listed phone number is (773) 736-6125.
What is Sara Hammer's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Sara Hammer enrolled in Medicare?
Yes. Sara Hammer 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 Sara Hammer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sara Hammer reassigns Medicare benefits to Advocate Health And Hospitals Corp. (Chicago, 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 Sara Hammer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sara Hammer accept?
Health plans from Oscar Health list Sara Hammer 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 Sara Hammer affiliated with any hospitals?
According to CMS data, Sara Hammer is affiliated with Advocate Illinois Masonic Medical Center.
When was this NPI record last updated?
The NPPES record for Sara Hammer was last updated on September 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Sara Helen Hammer, DO · NPI 1144858457
Family Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since March 31, 2020.
## Identity
- **NPI:** 1144858457 (Entity type: Individual)
- **Enumerated:** March 31, 2020
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 036-164028 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 3936 N MILWAUKEE AVE, Chicago, IL 60641-2703
- **Phone:** (773) 736-6125
## 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:** Advocate Health And Hospitals Corp. (NPI 1487951711, Chicago, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University, Chicago College Of Osteopathic Med, class of 2020
## Record status
- **NPPES last updated:** September 29, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1144858457) · Data from the CMS NPPES public registry.