Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Esther Alimboyao Sy, MD

Family Medicine Physician in Rockford, IL · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1659358703

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Esther Alimboyao Sy

Credential MD

Sex Female

Practice address 3401 N Perryville Rd, Rockford, IL, 61114

Phone (815) 971-2000

Fax (815) 971-9570

Enumeration date Dec 29, 2005

Last updated in NPPES Apr 22, 2026

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 036097622 (IL) Primary

261QU0200X Urgent Care Clinic/Center Ambulatory Health Care Facilities · License 036097622 (IL) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
553180	Other	IL	MEDICARE GROUP #
036097622	Medicaid	IL	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1659358703 active?

Yes, as of the latest NPPES snapshot, NPI 1659358703 is active (record last updated 2026-04-22).

How do I verify Esther Sy's NPI record?

Cross-check NPI 1659358703 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-22.