DR. JOHN NICHOLAS TASIOPOULOS D.O.
NPI 1346384492
Internal Medicine - Gastroenterology in Libertyville, IL
About Dr. John Nicholas Tasiopoulos D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN NICHOLAS TASIOPOULOS D.O. (NPI 1346384492) is an individual gastroenterology provider in Libertyville, Illinois, licensed in Illinois (207RG0100X) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Lake Forest Hospital, and is a graduate of Midwestern University, Chicago College Of Osteopathic Med (1991).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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. John Nicholas Tasiopoulos D.o. 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 John Tasiopoulos reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Libertyville, IL 60048
- Reassigned Medicare billing, Illinois enrollment
- 74 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 10
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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Lake Forest Hospital
Acute Care Hospitals · Lake Forest, ILAdvocate Illinois Masonic Medical Center
Acute Care Hospitals · Chicago, ILAdvocate Condell Medical Center
Acute Care Hospitals · Libertyville, ILAdvocate Good Shepherd Hospital
Acute Care Hospitals · Barrington, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60048 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.
LIBERTYVILLE, IL 60048
LIBERTYVILLE, IL 60048
LIBERTYVILLE, IL 60048
LIBERTYVILLE, IL 60048
LIBERTYVILLE, IL 60048
LIBERTYVILLE, IL 60048
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 John Tasiopoulos's NPI number?
The NPI number for John Tasiopoulos is 1346384492. It was assigned to this individual provider in the NPPES registry on February 19, 2007.
Where is John Tasiopoulos located?
John Tasiopoulos practices at 1880 W Winchester Rd Suite 201, Libertyville, IL 60048. The listed phone number is (847) 247-0187.
What is John Tasiopoulos's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is John Tasiopoulos enrolled in Medicare?
Yes. John Tasiopoulos 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 John Tasiopoulos's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Tasiopoulos reassigns Medicare benefits to Gi Partners Of Illinois, PLLC (Libertyville, 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 John Tasiopoulos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Tasiopoulos accept?
Health plans from Ambetter Health and Ambetter Health of Delaware list John Tasiopoulos 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 John Tasiopoulos affiliated with any hospitals?
According to CMS data, John Tasiopoulos is affiliated with Northwestern Lake Forest Hospital, Advocate Illinois Masonic Medical Center, Advocate Condell Medical Center and Advocate Good Shepherd Hospital.
When was this NPI record last updated?
The NPPES record for John Tasiopoulos was last updated on December 13, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. John Nicholas Tasiopoulos, D.O. · NPI 1346384492
Gastroenterology physician in Libertyville, Illinois. Individual provider, active in the CMS NPPES registry since February 19, 2007.
## Identity
- **NPI:** 1346384492 (Entity type: Individual)
- **Enumerated:** February 19, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** 207RG0100X (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 1880 W WINCHESTER RD, SUITE 201, Libertyville, IL 60048-5341
- **Phone:** (847) 247-0187 · **Fax:** (847) 247-0487
## 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:** Gi Partners Of Illinois, PLLC (NPI 1548613995, Libertyville, 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 1991
## Record status
- **NPPES last updated:** December 13, 2021
- **Other identifiers:** Medicaid 036-087154 (IL); Other 110136967 (IL); Other 4907305 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1346384492) · Data from the CMS NPPES public registry.