Nicholas Gaston Callihan, M.D.
NPI 1821482357ActiveIndividual· Emergency Medicine· Houston, TX
Emergency Medicine (M.D.) in Houston, Texas, trained at Medical College of Georgia School of Medicine (class of 2015). 237 Medicare patients in 2024, $33,453 paid; nearly all of their 182 Part D prescriptions were generic (95%). Salix Pharmaceuticals, A Division of Bausch Health US, LLC reported $20.90 in payments in 2024, mostly food and beverage.
Overview
| NPI | 1821482357 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 23, 2015 |
| Last updated in NPPES | Sep 13, 2024 |
| Certified by provider | Sep 13, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | R6532 | TX |
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 - Emergency Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 237 |
|---|---|
| Services billed | 284 across 21 procedure codes |
| Paid by Medicare | $33,453 |
Part D prescriptions in 2024
| Prescriptions (claims) | 182 · 184 30-day fills |
|---|---|
| Patients | 148 |
| Total drug cost | $1,467 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | Medical College of Georgia School of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Emergency Medicine |
Medical groups
- Ut PhysiciansHouston, TX · 1,765 clinicians
- Memorial Hermann Hospital Based Physician GroupKaty, TX · 276 clinicians
Hospital affiliations
- Memorial Hermann - Texas Medical CenterHouston, TX
- Memorial Hermann Hospital SystemHouston, TX
Industry payments (Open Payments)
- 2024$20.90 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $20.90 | 1 |
What the 2024 payments were for
- Food and Beverage$20.90 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 953 emergency medicine physicians in Houston · All emergency medicine physicians in Texas