DR. ESTHER ALIMBOYAO SY MD
NPI 1659358703
Family Medicine in Rockford, IL
About Dr. Esther Alimboyao Sy Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ESTHER ALIMBOYAO SY MD (NPI 1659358703) is an individual family medicine provider in Rockford, Illinois, licensed in Illinois (036097622) and active in the NPI registry since December 2005. She is enrolled in Medicare PECOS, is affiliated with Uw Health, and maintains a secondary practice location in Rockford.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 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. Esther Alimboyao Sy 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
4Medicare enrollment records show Esther Sy reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 474 clinicians in this Medicare group
Rockford, IL 61107
- Reassigned Medicare billing, Illinois enrollment
- 67 clinicians in this Medicare group
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 1,375 clinicians in this Medicare group
Peoria, IL 61615
- Reassigned Medicare billing, Illinois enrollment
- 2,944 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 2
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.
Uw Health
Acute Care Hospitals · Rockford, ILSaint Anthony Medical Center
Acute Care Hospitals · Rockford, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 61114 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.
ROCKFORD, IL 61114
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 Esther Sy's NPI number?
The NPI number for Esther Sy is 1659358703. It was assigned to this individual provider in the NPPES registry on December 29, 2005.
Where is Esther Sy located?
Esther Sy practices at 3401 N Perryville Rd, Rockford, IL 61114. The listed phone number is (815) 971-2000.
What is Esther Sy's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Esther Sy enrolled in Medicare?
Yes. Esther Sy 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 Esther Sy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Esther Sy reassigns Medicare benefits to 4 organizations: Swedishamerican Hospital (Rockford, IL), Saint Anthony Medical Center (Rockford, IL), Rockford Health Physicians (Rockford, IL) and Osf Multi-Specialty Group (Peoria, IL). 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 Esther Sy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Esther Sy accept?
Health plans from Aspirus Health Plan and Dean Health Plan list Esther Sy 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 Esther Sy affiliated with any hospitals?
According to CMS data, Esther Sy is affiliated with Uw Health and Saint Anthony Medical Center.
When was this NPI record last updated?
The NPPES record for Esther Sy was last updated on April 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Esther Alimboyao Sy, MD · NPI 1659358703
Family Medicine physician in Rockford, Illinois. Individual provider, active in the CMS NPPES registry since December 29, 2005.
## Identity
- **NPI:** 1659358703 (Entity type: Individual)
- **Enumerated:** December 29, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 036097622 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 3401 N PERRYVILLE RD, Rockford, IL 61114-8011
- **Phone:** (815) 971-2000 · **Fax:** (815) 971-9570
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Swedishamerican Hospital (NPI 1073167664, Rockford, IL); Saint Anthony Medical Center (NPI 1952356040, Rockford, IL); Rockford Health Physicians (NPI 1043242886, Rockford, IL); Osf Multi-Specialty Group (NPI 1154908929, Peoria, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1989
## Record status
- **NPPES last updated:** April 22, 2026
- **Other identifiers:** Other 553180 (IL); Medicaid 036097622 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1659358703) · Data from the CMS NPPES public registry.