DR. LESLIE JAY BLOCK MD
NPI 1750300166
Otolaryngology - Pediatric Otolaryngology in Lake Forest, IL
About Dr. Leslie Jay Block Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LESLIE JAY BLOCK MD (NPI 1750300166) is an individual pediatric otolaryngology provider in Lake Forest, Illinois and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with University Of Illinois Hospital And Clinics, and is a graduate of Other (1972).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Dr. Leslie Jay Block 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
2Medicare enrollment records show Leslie Block reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Gurnee, IL 60031
- Reassigned Medicare billing, Illinois enrollment
- 9 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 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.
University Of Illinois Hospital And Clinics
Acute Care Hospitals · Chicago, ILOther Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LAKE FOREST, IL 60045
LAKE FOREST, IL 60045
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 Leslie Block's NPI number?
The NPI number for Leslie Block is 1750300166. It was assigned to this individual provider in the NPPES registry on July 18, 2006.
Where is Leslie Block located?
Leslie Block practices at 700 N Westmoreland Rd Bld F, Lake Forest, IL 60045. The listed phone number is (847) 295-1114.
What is Leslie Block's specialty?
The primary specialty registered for this NPI is Otolaryngology, specializing in Pediatric Otolaryngology, with taxonomy code 207YP0228X.
Is Leslie Block enrolled in Medicare?
Yes. Leslie Block 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 Leslie Block's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leslie Block reassigns Medicare benefits to 2 organizations: Lake County Head And Neck Specialists S.C. (Gurnee, IL) and Northwestern Medical Faculty Foundation (Carol Stream, 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 Leslie Block's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Leslie Block affiliated with any hospitals?
According to CMS data, Leslie Block is affiliated with University Of Illinois Hospital And Clinics.
When was this NPI record last updated?
The NPPES record for Leslie Block was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Dr. Leslie Jay Block, MD · NPI 1750300166
Pediatric Otolaryngology physician in Lake Forest, Illinois. Individual provider, active in the CMS NPPES registry since July 18, 2006.
## Identity
- **NPI:** 1750300166 (Entity type: Individual)
- **Enumerated:** July 18, 2006
- **Primary specialty:** Otolaryngology - Pediatric Otolaryngology · taxonomy 207YP0228X
- **Sole proprietor:** No
## Practice location
- **Address:** 700 N WESTMORELAND RD, BLD F, Lake Forest, IL 60045-1679
- **Phone:** (847) 295-1114 · **Fax:** (847) 295-9373
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Lake County Head And Neck Specialists S.C. (NPI 1851432157, Gurnee, IL); Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1972
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Medicare UPIN C41984 (IL)
---
Source: [NPI Profile](https://npiprofile.com/npi/1750300166) · Data from the CMS NPPES public registry.