Karen Louise Herbst, PH.D., M.D.
Opted out of Medicare from March 2022 to March 2028. Internal Medicine, Endocrinology, Diabetes & Metabolism (PH.D., M.D.) in Tucson, Arizona, licensed in CA and AZ, with an NPI issued in May 2006. Part D covered 22 prescriptions written in 2024, 86% of them generic. Cashflow Solutions, LLC was the largest of 3 companies reporting payments in 2025, $36,464 in all, mostly consulting fees.
Overview
| NPI | 1114977840 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PH.D., M.D. |
| Sole proprietor | No |
| NPI issued | May 11, 2006 |
| Last updated in NPPES | Aug 25, 2025 |
| Certified by provider | Aug 25, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A80165 | CA |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | 47835 | AZ |
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 Mar 21, 2022 – Mar 21, 2028 |
| Can order and refer | No |
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) | 22 · 45 30-day fills |
|---|---|
| Patients | 11 |
| Total drug cost | $5,268 |
| Generic share | 86% of claims |
Industry payments (Open Payments)
- 2025$36,464 · 15 payments from 3 companies
- 2024$36,107 · 14 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Cashflow Solutions, LLC | $36,422 | 13 |
| Lilly USA, LLC | $22.46 | 1 |
| Tactile Systems Technology Inc | $19.58 | 1 |
What the 2025 payments were for
- Consulting Fee$36,000 · 12 payments
- Travel and Lodging$422.26 · 1 payment
- Food and Beverage$42.04 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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