Donald Gustave Ammerman, M.D.
NPI 1316032295ActiveIndividual· Psychiatry & Neurology, Psychiatry· Danbury, CT
Psychiatry & Neurology, Psychiatry (M.D.) in Danbury, Connecticut, trained at University of Connecticut School of Medicine (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $116,650 for 889 claims, against $38,792 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 7 companies reporting payments in 2025, $411,966 in all, mostly speaking and faculty fees.
Overview
| NPI | 1316032295 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 4, 2006 |
| Last updated in NPPES | Aug 20, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 047925 | CT |
| Psychiatry & Neurology, Psychiatry | 2084P0800X | RT1438 | NH |
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 - Psychiatry (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 48 |
|---|---|
| Services billed | 600 across 3 procedure codes |
| Paid by Medicare | $38,792 |
Part D prescriptions in 2024
| Prescriptions (claims) | 889 · 1,659 30-day fills |
|---|---|
| Patients | 81 |
| Total drug cost | $116,650 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | University of Connecticut School of Medicine |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Psychiatry |
| Secondary specialties | Addiction Medicine |
| Telehealth | Offers telehealth |
Medical group
- Contemporary Care LLCGreenwich, CT · 32 clinicians
Industry payments (Open Payments)
- 2025$411,966 · 505 payments from 7 companies
- 2024$279,657 · 389 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $133,065 | 150 |
| Abbvie Inc. | $132,253 | 162 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $112,901 | 121 |
| Vanda Pharmaceuticals Inc. | $33,524 | 57 |
| E.R. Squibb & Sons, L.L.C. | $135.31 | 11 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$367,823 · 130 payments
- Travel and Lodging$23,449 · 208 payments
- Food and Beverage$10,774 · 165 payments
- Consulting Fee$9,920 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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