Katja Kiseljak-Vassiliades, DO
NPI 1043353840ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Aurora, CO
Internal Medicine, Endocrinology, Diabetes & Metabolism (DO) with University Physicians Incorporated, practicing in Aurora, Colorado. Their prescriptions cost Medicare Part D more than their services did: $620,370 for 177 claims, against $8,843 paid for services in 2024. Recordati_rare_diseases_inc. reported $3,500 in payments in 2025, mostly honoraria. Lists Longs Peak Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1043353840 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Feb 14, 2007 |
| Last updated in NPPES | Aug 30, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | DR47946 | 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 - Endocrinology (CO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 53 |
|---|---|
| Services billed | 107 across 12 procedure codes |
| Paid by Medicare | $8,843 |
Part D prescriptions in 2024
| Prescriptions (claims) | 177 · 426 30-day fills |
|---|---|
| Patients | 32 |
| Total drug cost | $620,370 |
| Generic share | 67% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- University Physicians IncorporatedAurora, CO · 3,215 clinicians
Hospital affiliations
- Longs Peak HospitalLongmont, CO
- Uch-Memorial Health SystemColorado Springs, CO
- Uchealth Broomfield HospitalBroomfield, CO
- Uchealth Highlands Ranch HospitalHighlands Ranch, CO
- University of Colorado Hospital AuthorityAurora, CO
Industry payments (Open Payments)
- 2025$3,500 · 1 payment from 1 company
- 2024$72.27 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Recordati_rare_diseases_inc. | $3,500 | 1 |
What the 2025 payments were for
- Honoraria$3,500 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 53 endocrinologists in Aurora · All endocrinologists in Colorado