Eugene Chia-Shiuh Chaung, M.D.
NPI 1659715571ActiveIndividual· Internal Medicine, Infectious Disease· Webster, TX
Internal Medicine, Infectious Disease (M.D.) in Webster, Texas, trained at Texas Tech University Health Science Center School of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $1,956,836 for 1,657 claims, against $5,217 paid for services in 2024. Phathom Pharmaceuticals, Inc. was the largest of 3 companies reporting payments in 2025, $374.01 in all, mostly food and beverage.
Overview
| NPI | 1659715571 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 22, 2013 |
| Last updated in NPPES | May 26, 2026 |
| Certified by provider | May 26, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | R7416 | TX |
| Internal Medicine | 207R00000X | R7416 | TX |
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 (NM); Practitioner - Infectious Disease (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 49 |
|---|---|
| Services billed | 50 across 1 procedure code |
| Paid by Medicare | $5,217 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,657 · 2,209 30-day fills |
|---|---|
| Patients | 98 |
| Total drug cost | $1,956,836 |
| Generic share | 56% of claims |
Education and affiliations
| Medical school | Texas Tech University Health Science Center School of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Infectious Disease |
Medical groups
- Cls Health PLLCWebster, TX · 180 clinicians
- Legacy Community Health Services, IncHouston, TX · 155 clinicians
Hospital affiliations
- HCA Houston Healthcare Clear LakeWebster, TX
- Houston Methodist Clear Lake HospitalNassau Bay, TX
Industry payments (Open Payments)
- 2025$374.01 · 3 payments from 3 companies
- 2024$282.40 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $130.94 | 1 |
| Gilead Sciences, Inc. | $121.82 | 1 |
| Viiv Healthcare Company | $121.25 | 1 |
What the 2025 payments were for
- Food and Beverage$374.01 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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