Samuel Stack, OD
NPI 1114542149ActiveIndividual· Optometrist· Littleton, NH
Optometrist (OD) in Littleton, New Hampshire, trained at State University of New York - State College Optometry (class of 2020). In 2024 Medicare paid $36,430 for 382 patients, and Part D covered 167 of their prescriptions, 57% of them generic. Alcon Vision LLC was the largest of 2 companies reporting payments in 2025, $35.75 in all, mostly food and beverage.
Overview
| NPI | 1114542149 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | OD |
| Sole proprietor | No |
| NPI issued | Jun 16, 2020 |
| Last updated in NPPES | Aug 27, 2021 |
| Certified by provider | Aug 27, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Optometrist Primary | 152W00000X | 1042 | NH |
| Optometrist | 152W00000X | OEG003662 | PA |
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 - Optometry (NH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 382 |
|---|---|
| Services billed | 569 across 16 procedure codes |
| Paid by Medicare | $36,430 |
Part D prescriptions in 2024
| Prescriptions (claims) | 167 · 246 30-day fills |
|---|---|
| Patients | 40 |
| Total drug cost | $34,701 |
| Generic share | 57% of claims |
Education and affiliations
| Medical school | State University of New York - State College Optometry |
|---|---|
| Graduation year | 2020 |
| Medicare specialty | Optometry |
Medical group
- Envision Eye Care, PLLCLittleton, NH · 6 clinicians
Industry payments (Open Payments)
- 2025$35.75 · 2 payments from 2 companies
- 2024$133.16 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $18.07 | 1 |
| Biotissue Holdings Inc. | $17.68 | 1 |
What the 2025 payments were for
- Food and Beverage$35.75 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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