Isaac Van Sligtenhorst, MD
NPI 1194105064ActiveIndividual· Family Medicine· Spring, TX
Family Medicine (MD) in Spring, Texas, trained at University of Texas Medical School at Houston (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $247,177 for 2,941 claims, against $6,976 paid for services in 2024. Exact Sciences Corporation was the largest of 8 companies reporting payments in 2025, $265.22 in all, mostly food and beverage.
Overview
| NPI | 1194105064 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 4, 2015 |
| Last updated in NPPES | Aug 14, 2026 |
| Certified by provider | Aug 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | S2188 | 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 - Family Practice (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 27 |
|---|---|
| Services billed | 331 across 33 procedure codes |
| Paid by Medicare | $6,976 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,941 · 7,003 30-day fills |
|---|---|
| Patients | 412 |
| Total drug cost | $247,177 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at Houston |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- Memorial Hermann Medical GroupSugar Land, TX · 762 clinicians
Hospital affiliation
- Memorial Hermann Hospital SystemHouston, TX
Industry payments (Open Payments)
- 2025$265.22 · 12 payments from 8 companies
- 2024$50.57 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $55.54 | 2 |
| Lilly USA, LLC | $46.16 | 2 |
| Novo Nordisk Inc | $42.64 | 2 |
| Abbvie Inc. | $38.06 | 2 |
| Dexcom, Inc. | $25.74 | 1 |
What the 2025 payments were for
- Food and Beverage$265.22 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 103 family medicine physicians in Spring · All family medicine physicians in Texas