GARY L LOY
NPI 1851404073
Obstetrics & Gynecology - Maternal & Fetal Medicine in Chicago, IL
About Gary L Loy NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GARY L LOY (NPI 1851404073) is an individual maternal & fetal medicine provider in Chicago, Illinois, licensed in Indiana (01090808A) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Carle Foundation Hospital, and maintains a secondary practice location in Indianapolis.
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
Gary L Loy 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
8Medicare enrollment records show Gary Loy reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60637
- Reassigned Medicare billing, Illinois enrollment
- 1,905 clinicians in this Medicare group
Chicago, IL 60637
- Reassigned Medicare billing, Illinois and Indiana enrollments
- 2,237 clinicians in this Medicare group
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 clinicians in this Medicare group
Rockford, IL 61114
- Reassigned Medicare billing, Illinois enrollment
- 1,375 clinicians in this Medicare group
Hoopeston, IL 60942
- Reassigned Medicare billing, Illinois enrollment
- 488 clinicians in this Medicare group
Urbana, IL 61801
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Carle Health Care Incorporated
- 2,516 clinicians in this Medicare group
Indianapolis, IN 46260
- Reassigned Medicare billing, Indiana enrollment
- 294 clinicians in this Medicare group
Olney, IL 62450
- Reassigned Medicare billing, Illinois enrollment
- 301 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.
Carle Foundation Hospital
Acute Care Hospitals · Urbana, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60637 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 60637
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 Gary Loy's NPI number?
The NPI number for Gary Loy is 1851404073. It was assigned to this individual provider in the NPPES registry on August 15, 2006.
Where is Gary Loy located?
Gary Loy practices at 5841 S Maryland Ave, Chicago, IL 60637. The listed phone number is (888) 824-0200.
What is Gary Loy's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.
Is Gary Loy enrolled in Medicare?
Yes. Gary Loy 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 Gary Loy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gary Loy reassigns Medicare benefits to 8 organizations: The University Of Chicago Medical Center (Chicago, IL), University Of Chicago (Chicago, IL), Advocate Health & Hospitals Corporation (Oak Lawn, IL), Rockford Health Physicians (Rockford, IL), Hoopeston Community Memorial Hospital (Hoopeston, IL) and 3 more organizations, listed in the Medicare section above. 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 Gary Loy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gary Loy accept?
Health plans from Anthem Blue Cross and Blue Shield, CareSource and Oscar Health list Gary Loy 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 Gary Loy affiliated with any hospitals?
According to CMS data, Gary Loy is affiliated with Carle Foundation Hospital.
When was this NPI record last updated?
The NPPES record for Gary Loy was last updated on September 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Gary L Loy · NPI 1851404073
Maternal & Fetal Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since August 15, 2006.
## Identity
- **NPI:** 1851404073 (Entity type: Individual)
- **Enumerated:** August 15, 2006
- **Primary specialty:** Obstetrics & Gynecology - Maternal & Fetal Medicine · taxonomy 207VM0101X
- **State license:** 01090808A (Indiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 5841 S MARYLAND AVE, Chicago, IL 60637-1443
- **Phone:** (888) 824-0200
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): The University Of Chicago Medical Center (NPI 1033218128, Chicago, IL); University Of Chicago (NPI 1821048786, Chicago, IL); Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL); Rockford Health Physicians (NPI 1043242886, Rockford, IL); Hoopeston Community Memorial Hospital (NPI 1578504544, Hoopeston, IL); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 1981
## Record status
- **NPPES last updated:** September 3, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1851404073) · Data from the CMS NPPES public registry.