Zarema J. Singson, M.D.
NPI 1003068008ActiveIndividual· Internal Medicine, Gastroenterology· San Antonio, TX
Internal Medicine, Gastroenterology (M.D.) in San Antonio, Texas, trained at University of Texas Medical School at San Antonio (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $238,098 for 1,213 claims, against $108,564 paid for services in 2024. Abbvie Inc. was the largest of 8 companies reporting payments in 2025, $452.91 in all, mostly food and beverage.
Overview
| NPI | 1003068008 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 21, 2008 |
| Last updated in NPPES | Mar 17, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | P4383 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 445 |
|---|---|
| Services billed | 2,453 across 34 procedure codes |
| Paid by Medicare | $108,564 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,213 · 1,943 30-day fills |
|---|---|
| Patients | 584 |
| Total drug cost | $238,098 |
| Generic share | 62% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at San Antonio |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Texas Digestive Disease Consultants, PLLCFlower Mound, TX · 608 clinicians
Hospital affiliation
- Methodist HospitalSan Antonio, TX
Industry payments (Open Payments)
- 2025$452.91 · 33 payments from 8 companies
- 2024$493.07 · 20 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $245.75 | 21 |
| Lilly USA, LLC | $49.37 | 3 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $42.11 | 2 |
| Janssen Biotech, Inc. | $34.43 | 2 |
| Pfizer Inc. | $27.89 | 2 |
What the 2025 payments were for
- Food and Beverage$452.91 · 33 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in San Antonio
- 1982807186
- 1679671994
- 1417103219
- 1427386234
- 1740404391
- 1053490631
- 1821298225
- 1245894013
- 1992044366
- 1952735102
- 1437284460
- 1427150697
All Internal Medicine, Gastroenterology providers in Texas →