Louis C. Garrot, M.D.
NPI 1609941335ActiveIndividual· Internal Medicine, Hematology & Oncology· Marietta, GA
Internal Medicine, Hematology & Oncology (M.D.) with Nsh Cancer Institute Professional Services G LLC, practicing in Marietta, Georgia. Their prescriptions cost Medicare Part D more than their services did: $5,831,841 for 2,139 claims, against $66,907 paid for services in 2024. Pfizer Inc. was the largest of 21 companies reporting payments in 2025, $1,488 in all, mostly food and beverage. Lists Northside Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1609941335 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 21, 2006 |
| Last updated in NPPES | Aug 7, 2024 |
| Certified by provider | Aug 7, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 59157 | GA |
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 - Hematology/Oncology (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 370 |
|---|---|
| Services billed | 1,217 across 13 procedure codes |
| Paid by Medicare | $66,907 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,139 · 2,517 30-day fills |
|---|---|
| Patients | 231 |
| Total drug cost | $5,831,841 |
| Generic share | 68% of claims |
Education and affiliations
| Graduation year | 1999 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
Medical group
- Nsh Cancer Institute Professional Services G LLCStockbridge, GA · 119 clinicians
Hospital affiliations
- Northside HospitalAtlanta, GA
- Northside Hospital CherokeeCanton, GA
- Northside Hospital ForsythCumming, GA
- Wellstar Cobb Medical CenterAustell, GA
- Wellstar Kennestone Regional Medical CenterMarietta, GA
Other facilities
- Wellstar Windy Hill HospitalLong-term care hospital · Marietta, GA
Industry payments (Open Payments)
- 2025$1,488 · 50 payments from 21 companies
- 2024$5,109 · 52 payments from 24 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $227.64 | 11 |
| Janssen Biotech, Inc. | $136.13 | 5 |
| Exelixis Inc. | $133.64 | 1 |
| Astellas Pharma US Inc | $128.33 | 2 |
| E.R. Squibb & Sons, L.L.C. | $124.18 | 2 |
What the 2025 payments were for
- Food and Beverage$1,242 · 45 payments
- Education$246.03 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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