Kristen Lynn Zack, MD
NPI 1376105692ActiveIndividual· Internal Medicine, Nephrology· Billings, MT
Internal Medicine, Nephrology (MD) with Billings Clinic Specialty Supplies and Services, LLC, practicing in Billings, Montana. In 2024 Medicare paid $25,141 for 125 patients, and Part D covered 131 of their prescriptions, 60% of them generic. Travere Therapeutics, Inc. was the largest of 3 companies reporting payments in 2025, $160.83 in all, mostly food and beverage. Lists Billings Clinic Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1376105692 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 8, 2019 |
| Last updated in NPPES | Aug 28, 2025 |
| Certified by provider | Aug 28, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 162224 | MT |
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 - Nephrology (MT); Practitioner - Nephrology (WY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 125 |
|---|---|
| Services billed | 225 across 16 procedure codes |
| Paid by Medicare | $25,141 |
Part D prescriptions in 2024
| Prescriptions (claims) | 131 · 231 30-day fills |
|---|---|
| Patients | 35 |
| Total drug cost | $36,076 |
| Generic share | 60% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Nephrology |
Medical group
- Billings Clinic Specialty Supplies and Services, LLCBillings, MT · 824 clinicians
Hospital affiliations
- Billings Clinic HospitalBillings, MT
- Glendive Medical CenterGlendive, MT
- Johnson County Healthcare CenterBuffalo, WY
- Sheridan Memorial HospitalSheridan, WY
- Sidney Health CenterSidney, MT
Industry payments (Open Payments)
- 2025$160.83 · 3 payments from 3 companies
- 2024$351.62 · 7 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Travere Therapeutics, Inc. | $99.93 | 1 |
| Outset Medical Inc | $35.79 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $25.11 | 1 |
What the 2025 payments were for
- Food and Beverage$160.83 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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