John Nicholas Tasiopoulos, D.O.
Gastroenterology Physician · Libertyville, IL
John Nicholas Tasiopoulos, D.O. is a gastroenterology physician with a practice address in Libertyville, Illinois, and NPI 1346384492, issued on Feb 19, 2007. Check the license (Illinois 207RG0100X, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Nicholas Tasiopoulos
- Credential
- D.O.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 207RG0100X IL
Self-reported in NPPES; status is on the state search - Practice location
- 1880 W Winchester RD, Libertyville, IL 60048
- Phone
- (847) 247-0187
- Enumerated
- Feb 19, 2007
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (847) 247-0487
- Medicaid ID
- 036-087154 IL
- Medicare enrollment
- Enrolled (PECOS I20051005001257); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1991
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 1880 W Winchester RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arkan Alrashid, M.D.Gastroenterology Physician1851348916
- Annette Arnold, D.N.Naprapath1477794030
- Eric Jeffries, FNPNurse Practitioner1417300161
- Sean Lee, M.D.Gastroenterology Physician1194765248
- Steven Marquardt, MDPain Medicine (Anesthesiology) Physician1972578227
- Emmanuel Njoku, MDInternal Medicine Physician1689981045
Verify John Nicholas Tasiopoulos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 207RG0100XCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,655 Medicare Part D claims for 416 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Pantoprazole Sodium901 claims
- Omeprazole125 claims
- Famotidine82 claims
- Cholestyramine46 claims
- Cholestyramine Light43 claims
- Mesalamine39 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $3,897.32
205 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- GI Partners OF Illinois LLCLibertyville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Nicholas Tasiopoulos among 887 gastroenterology physician records in Illinois
John Nicholas Tasiopoulos, D.O. is one of 887 gastroenterology physician records with a practice address in Illinois. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 45% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1991 · median 2003 among the 643 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Libertyville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Philip Adjei, M.D.Libertyville, IL 600481720080054
- Arkan Alrashid, M.D.Libertyville, IL 600481851348916
- Mohammad Bawani, MDLibertyville, IL 600481407858152
- Robert Hadesman, M.D.Libertyville, IL 600481245234574
- Saad Hashmi, MDLibertyville, IL 600481326579434
- Ahmad Hassan, MDLibertyville, IL 600481033572904
- Timothy Laurie, D.O.Libertyville, IL 600481790941078
- Sean Lee, M.D.Libertyville, IL 600481194765248
Common questions
What is John Nicholas Tasiopoulos, D.O.'s NPI number?
John Nicholas Tasiopoulos, D.O.'s National Provider Identifier (NPI) is 1346384492, issued on Feb 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Nicholas Tasiopoulos, D.O. located?
The NPPES record lists a practice address at 1880 W Winchester RD, Libertyville, IL, 60048. Phone: (847) 247-0187. Providers update this record themselves, so call before visiting.
How can I verify John Nicholas Tasiopoulos, D.O.'s license?
NPPES lists Illinois license number 207RG0100X, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Nicholas Tasiopoulos, D.O. prescribe under Medicare Part D?
In 2024, John Nicholas Tasiopoulos, D.O. had 1,655 Medicare Part D claims for 416 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.