Vicente Lam Siu, M.D.
NPI 1497958862ActiveIndividual· Internal Medicine· San Angelo, TX
Internal Medicine (M.D.) in San Angelo, Texas, trained at University of Puerto Rico School of Medicine (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $1,039,605 for 12,407 claims, against $261,745 paid for services in 2024. Merck Sharp & Dohme LLC was the largest of 12 companies reporting payments in 2025, $510.00 in all, mostly food and beverage.
Overview
| NPI | 1497958862 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 6, 2007 |
| Last updated in NPPES | Jan 29, 2020 |
| Certified by provider | Jan 29, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | R9092 | 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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 560 |
|---|---|
| Services billed | 4,466 across 70 procedure codes |
| Paid by Medicare | $261,745 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,407 · 26,860 30-day fills |
|---|---|
| Patients | 655 |
| Total drug cost | $1,039,605 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Puerto Rico School of Medicine |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Shannon ClinicSan Angelo, TX · 559 clinicians
- The West Texas Rehabilitation CenterSan Angelo, TX · 466 clinicians
Hospital affiliations
- Ballinger Memorial HospitalBallinger, TX
- Shannon Medical CenterSan Angelo, TX
Other facilities
- Angels Care Home Health of San AngeloHome health agency · San Angelo, TX
- Centerwell Home HealthHome health agency · Eastland, TX
- Paradigm Home HealthHome health agency · San Angelo, TX
- Shannon Home Health ServicesHome health agency · San Angelo, TX
- Shannon Rehabilitation Hospital, An Affiliate of EInpatient rehabilitation facility · San Angelo, TX
Industry payments (Open Payments)
- 2025$510.00 · 28 payments from 12 companies
- 2024$86.40 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $103.70 | 5 |
| Pfizer Inc. | $89.43 | 5 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $67.05 | 4 |
| Lilly USA, LLC | $54.95 | 3 |
| Novo Nordisk Inc | $44.17 | 3 |
What the 2025 payments were for
- Food and Beverage$510.00 · 28 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 63 internal medicine physicians in San Angelo · All internal medicine physicians in Texas