Catherine Brittain Callahan, MD
NPI 1407870926ActiveIndividual· Internal Medicine· Charlotte, NC
Internal Medicine (MD) in Charlotte, North Carolina, trained at Medical College of Georgia School of Medicine (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $599,358 for 7,744 claims, against $143,690 paid for services in 2024. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $431.80 in all, mostly food and beverage.
Overview
| NPI | 1407870926 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 27, 2006 |
| Last updated in NPPES | May 6, 2026 |
| Certified by provider | May 6, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 200101316 | NC |
| Internal Medicine | 207R00000X | 92028 | SC |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (NC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 426 |
|---|---|
| Services billed | 3,888 across 58 procedure codes |
| Paid by Medicare | $143,690 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,744 · 19,100 30-day fills |
|---|---|
| Patients | 704 |
| Total drug cost | $599,358 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | Medical College of Georgia School of Medicine |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Comprehab, IncGastonia, NC · 415 clinicians
- The Weston Group IncCanton, GA · 207 clinicians
- Tryon Medical Partners, PLLCCharlotte, NC · 141 clinicians
Hospital affiliations
- Carolinas Medical Center/Behav HealthCharlotte, NC
- Piedmont Medical CenterRock Hill, SC
Industry payments (Open Payments)
- 2025$431.80 · 22 payments from 11 companies
- 2024$651.93 · 34 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $97.16 | 3 |
| Novo Nordisk Inc | $68.68 | 3 |
| Amgen Inc. | $44.62 | 3 |
| Pfizer Inc. | $42.03 | 2 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $37.95 | 4 |
What the 2025 payments were for
- Food and Beverage$431.80 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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