Dara Grennan
NPI 1518282938ActiveIndividual· Internal Medicine, Infectious Disease· Dixon, IL
Internal Medicine, Infectious Disease with Cook County, practicing in Dixon, Illinois. Their prescriptions cost Medicare Part D more than their services did: $708,266 for 652 claims, against $5,448 paid for services in 2024. Lists John H Stroger Jr Hospital as a hospital affiliation.
Overview
| NPI | 1518282938 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Mar 29, 2010 |
| Last updated in NPPES | Apr 26, 2021 |
| Certified by provider | Apr 26, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | 036-137502 | IL |
| Internal Medicine | 207R00000X | 036-137502 | IL |
| Hospitalist | 208M00000X | 8153445 | UT |
| Hospitalist | 208M00000X | 36.137502 | 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 - Hospitalist (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 38 |
|---|---|
| Services billed | 55 across 9 procedure codes |
| Paid by Medicare | $5,448 |
Part D prescriptions in 2024
| Prescriptions (claims) | 652 · 882 30-day fills |
|---|---|
| Patients | 29 |
| Total drug cost | $708,266 |
| Generic share | 60% of claims |
Education and affiliations
| Graduation year | 2007 |
|---|---|
| Medicare specialty | Hospitalist |
| Secondary specialties | Infectious Disease, Internal Medicine |
Medical group
- Cook CountyChicago, IL · 788 clinicians
Hospital affiliation
- John H Stroger Jr HospitalChicago, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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