Messina M. Michalsky, PMHNP
NPI 1568867588ActiveIndividual· Nurse Practitioner, Psych/Mental Health· Billings, MT
Nurse Practitioner, Psych/Mental Health (PMHNP) with Integrative Mental Health Services PLLC, practicing in Billings, Montana. Their prescriptions cost Medicare Part D more than their services did: $163,892 for 1,272 claims, against $14,968 paid for services in 2024. Teva Pharmaceuticals USA, Inc. was the largest of 3 companies reporting payments in 2025, $188.40 in all, mostly education.
Overview
| NPI | 1568867588 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PMHNP |
| Sole proprietor | No |
| NPI issued | Nov 3, 2014 |
| Last updated in NPPES | Nov 17, 2022 |
| Certified by provider | Nov 17, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Psych/Mental Health Primary | 363LP0808X | RXN.0101748-NP | CO |
| Registered Nurse | 163W00000X | 1630069 | CO |
| Nurse Practitioner, Psych/Mental Health | 363LP0808X | APN.0991471 | CO |
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 - Nurse Practitioner (CO); Practitioner - Nurse Practitioner (MT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 22 |
|---|---|
| Services billed | 238 across 8 procedure codes |
| Paid by Medicare | $14,968 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,272 · 1,565 30-day fills |
|---|---|
| Patients | 48 |
| Total drug cost | $163,892 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Integrative Mental Health Services PLLCBillings, MT · 3 clinicians
Industry payments (Open Payments)
- 2025$188.40 · 5 payments from 3 companies
- 2024$82.80 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Teva Pharmaceuticals USA, Inc. | $121.15 | 2 |
| Neurocrine Biosciences, Inc. | $47.66 | 2 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $19.59 | 1 |
What the 2025 payments were for
- Education$99.00 · 1 payment
- Food and Beverage$89.40 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 51 psychiatric nurse practitioners in Billings · All psychiatric nurse practitioners in Montana