Tammy Denise Johnston, NP
Opted out of Medicare from December 2025 to December 2027. Nurse Practitioner, Gerontology (NP) in Minneapolis, Minnesota, licensed in MN, with an NPI issued in February 2017. Their prescriptions cost Medicare Part D more than their services did: $223,134 for 959 claims, against $10,821 paid for services in 2024. Exact Sciences Corporation reported $15.11 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1528507886 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | Yes |
| NPI issued | Feb 20, 2017 |
| Last updated in NPPES | Jun 24, 2024 |
| Certified by provider | Jun 24, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Gerontology Primary | 363LG0600X | 5000 | MN |
| Nurse Practitioner | 363L00000X | CNP 5000 | MN |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Opt-out | Opted out Dec 9, 2025 – Dec 9, 2027 |
| Can order and refer | Yes |
| Accepts assignment | Yes (participating) |
During an opt-out period the provider sees Medicare patients only under private contracts, and Medicare does not pay claims for their services.
Medicare services in 2024
| Medicare patients | 84 |
|---|---|
| Services billed | 127 across 10 procedure codes |
| Paid by Medicare | $10,821 |
Part D prescriptions in 2024
| Prescriptions (claims) | 959 · 2,279 30-day fills |
|---|---|
| Patients | 168 |
| Total drug cost | $223,134 |
| Generic share | 80% of claims |
Industry payments (Open Payments)
- 2025$15.11 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $15.11 | 1 |
What the 2025 payments were for
- Food and Beverage$15.11 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 109 gerontology nurse practitioners in Minneapolis · All gerontology nurse practitioners in Minnesota