Patricia Katherine Merlo, D.O.
NPI 1972501161ActiveIndividual· Internal Medicine· Elgin, IL
Internal Medicine (D.O.) in Elgin, Illinois, trained at Perelman School of Med at the University of Pennsylvania (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $395,431 for 6,810 claims, against $140,905 paid for services in 2024. Lilly USA, LLC reported $31.57 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1972501161 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jul 12, 2005 |
| Last updated in NPPES | Apr 19, 2022 |
| Certified by provider | Apr 19, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036089508 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 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 | 426 |
|---|---|
| Services billed | 2,209 across 29 procedure codes |
| Paid by Medicare | $140,905 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,810 · 17,690 30-day fills |
|---|---|
| Patients | 581 |
| Total drug cost | $395,431 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Perelman School of Med at the University of Pennsylvania |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
Hospital affiliations
- Advocate Good Shepherd HospitalBarrington, IL
- Advocate Sherman HospitalElgin, IL
- Northwestern Medicine Central Dupage HospitalWinfield, IL
- Northwestern Medicine Kishwaukee HospitalDekalb, IL
- Saint Joseph Hospital-ElginElgin, IL
Other facilities
- Advocate Home Health Care ServHome health agency · Oakbrook, IL
Industry payments (Open Payments)
- 2025$31.57 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $31.57 | 1 |
What the 2025 payments were for
- Food and Beverage$31.57 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 85 internal medicine physicians in Elgin · All internal medicine physicians in Illinois