Oscar Luis Llanos Ulloa, M.D.
NPI 1235544313ActiveIndividual· Internal Medicine, Critical Care Medicine· Columbia, MO
Internal Medicine, Critical Care Medicine (M.D.) with The Curators of the University of Missouri, practicing in Columbia, Missouri. Their prescriptions cost Medicare Part D more than their services did: $247,946 for 242 claims, against $70,966 paid for services in 2024. United Therapeutics Corporation was the largest of 2 companies reporting payments in 2025, $380.35 in all, mostly food and beverage. Lists Boone Hospital Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1235544313 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 26, 2014 |
| Last updated in NPPES | Apr 18, 2023 |
| Certified by provider | Apr 18, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Critical Care Medicine Primary | 207RC0200X | 2021035036 | MO |
| Internal Medicine, Pulmonary Disease | 207RP1001X | 16339 | ND |
| Internal Medicine, Pulmonary Disease | 207RP1001X | 2021035036 | MO |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Critical Care (Intensivists) (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 253 |
|---|---|
| Services billed | 741 across 43 procedure codes |
| Paid by Medicare | $70,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 242 · 365 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $247,946 |
| Generic share | 59% of claims |
Education and affiliations
| Graduation year | 2007 |
|---|---|
| Medicare specialty | Critical Care (Intensivists) |
| Secondary specialties | Pulmonary Disease |
Medical group
- The Curators of the University of MissouriColumbia, MO · 1,131 clinicians
Hospital affiliations
- Boone Hospital CenterColumbia, MO
- University of Missouri Health CareColumbia, MO
Industry payments (Open Payments)
- 2025$380.35 · 4 payments from 2 companies
- 2024$206.34 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| United Therapeutics Corporation | $275.23 | 3 |
| Merck Sharp & Dohme LLC | $105.12 | 1 |
What the 2025 payments were for
- Food and Beverage$380.35 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 23 critical care physicians in Columbia · All critical care physicians in Missouri