Xavier W. Parreno, M.D.
NPI 1023085479ActiveIndividual· Internal Medicine· Gurnee, IL
Internal Medicine (M.D.) in Gurnee, Illinois, trained at R Franklin University of Med & Sci/Chicago Medical School (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $2,006,830 for 11,331 claims, against $120,947 paid for services in 2024. Corcept Therapeutics was the largest of 26 companies reporting payments in 2025, $5,628 in all, mostly food and beverage.
Overview
| NPI | 1023085479 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 3, 2006 |
| Last updated in NPPES | Mar 30, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036097735 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 240 |
|---|---|
| Services billed | 1,943 across 36 procedure codes |
| Paid by Medicare | $120,947 |
Part D prescriptions in 2024
| Prescriptions (claims) | 11,331 · 19,637 30-day fills |
|---|---|
| Patients | 345 |
| Total drug cost | $2,006,830 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | R Franklin University of Med & Sci/Chicago Medical School |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Northwestern Lake Forest HospitalLake Forest, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Vista Medical Center EastWaukegan, IL
Other facilities
- American Home Care Express IncHome health agency · Lincolnwood, IL
- Assure Home Healthcare, IncHome health agency · Libertyville, IL
Industry payments (Open Payments)
- 2025$5,628 · 241 payments from 26 companies
- 2024$5,820 · 258 payments from 31 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $737.37 | 32 |
| Astrazeneca Pharmaceuticals LP | $555.30 | 31 |
| Pfizer Inc. | $519.46 | 26 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $477.78 | 17 |
| Lilly USA, LLC | $400.83 | 18 |
What the 2025 payments were for
- Food and Beverage$5,628 · 241 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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