Olivia Anna Jean Begasse De Dhaem, M.D.
NPI 1639557408ActiveIndividual· Psychiatry & Neurology, Neurology· Stamford, CT
Opted out of Medicare from April 2025 to April 2027. Psychiatry & Neurology, Neurology (M.D.) in Stamford, Connecticut, licensed in CT and MA, with an NPI issued in May 2015. Part D covered 178 prescriptions written in 2024, 75% of them generic. Pfizer Inc. was the largest of 2 companies reporting payments in 2025, $8,055 in all, mostly consulting fees.
Overview
| NPI | 1639557408 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 13, 2015 |
| Last updated in NPPES | Feb 2, 2026 |
| Certified by provider | Feb 2, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Neurology Primary | 2084N0400X | 64919 | CT |
| Psychiatry & Neurology, Neurology | 2084N0400X | 277815 | MA |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Apr 1, 2025 – Apr 1, 2027 |
| Can order and refer | Yes |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Part D prescriptions in 2024
| Prescriptions (claims) | 178 · 270 30-day fills |
|---|---|
| Patients | 28 |
| Total drug cost | $62,720 |
| Generic share | 75% of claims |
Industry payments (Open Payments)
- 2025$8,055 · 10 payments from 2 companies
- 2024$16,689 · 27 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $7,894 | 8 |
| Lundbeck LLC | $160.97 | 2 |
What the 2025 payments were for
- Consulting Fee$5,762 · 2 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$2,004 · 1 payment
- Food and Beverage$289.45 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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