Christopher M. Callahan, MD
NPI 1104867043ActiveIndividual· Internal Medicine, Geriatric Medicine· Indianapolis, IN
Internal Medicine, Geriatric Medicine (MD) in Indianapolis, Indiana, licensed in IN, with an NPI issued in June 2006. 19 Medicare patients in 2024, $1,135 paid; all of their 76 Part D prescriptions were generic.
Overview
| NPI | 1104867043 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 10, 2006 |
| Last updated in NPPES | Sep 15, 2025 |
| Certified by provider | Sep 15, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | 01036319A | IN |
| Internal Medicine | 207R00000X | 01036319A | IN |
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 (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 19 |
|---|---|
| Services billed | 22 across 5 procedure codes |
| Paid by Medicare | $1,135 |
Part D prescriptions in 2024
| Prescriptions (claims) | 76 · 139 30-day fills |
|---|---|
| Patients | 24 |
| Total drug cost | $1,405 |
| Generic share | 100% of claims |
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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