Mark E. Lassise, M.D.
NPI 1023002508ActiveIndividual· Psychiatry & Neurology, Psychiatry· Mason City, IA
Psychiatry & Neurology, Psychiatry (M.D.) in Mason City, Iowa, trained at University of Colorado School of Medicine, Denver (class of 1980). 120 Medicare patients in 2024, $26,697 paid; nearly all of their 709 Part D prescriptions were generic (98%). Otsuka America Pharmaceutical, Inc. was the largest of 12 companies reporting payments in 2025, $997.94 in all, mostly food and beverage.
Overview
| NPI | 1023002508 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 9, 2005 |
| Last updated in NPPES | Jul 6, 2020 |
| Certified by provider | Jul 6, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 22919 | IA |
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 (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 120 |
|---|---|
| Services billed | 922 across 10 procedure codes |
| Paid by Medicare | $26,697 |
Part D prescriptions in 2024
| Prescriptions (claims) | 709 · 840 30-day fills |
|---|---|
| Patients | 101 |
| Total drug cost | $34,346 |
| Generic share | 98% of claims |
Education and affiliations
| Medical school | University of Colorado School of Medicine, Denver |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Psychiatry |
| Telehealth | Offers telehealth |
Medical group
- North Iowa Mercy ClinicsMason City, IA · 302 clinicians
Hospital affiliations
- Madison County Health Care SystemWinterset, IA
- Mercy Medical Center-New HamptonNew Hampton, IA
- Mercyone Oelwein Medical CenterOelwein, IA
- Mitchell County Regional HealthOsage, IA
- Regional Health Services of Howard CountyCresco, IA
Industry payments (Open Payments)
- 2025$997.94 · 50 payments from 12 companies
- 2024$954.67 · 54 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $262.63 | 12 |
| Abbvie Inc. | $194.36 | 11 |
| Teva Pharmaceuticals USA, Inc. | $142.70 | 6 |
| Neurocrine Biosciences, Inc. | $118.19 | 6 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $59.56 | 3 |
What the 2025 payments were for
- Food and Beverage$997.94 · 50 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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