Internal Medicine, Endocrinology, Diabetes, & Metabolism · Aurora, CO
NPI
1043353840
Since 2007
Specialty
Internal Medicine, Endocrinology, Diabetes, & Metabolism
Code 207RE0101X
Group practices
1
Medicare group memberships
Hospitals
5
Hospital affiliations
12605 E 16th Ave
Aurora, CO, 80045
Phone (720) 848-0000
Groups this clinician bills Medicare through
Medicare paid, 2024
$8,843
107 services
Medicare patients, 2024
53
Average age 67
Drug cost, 2024
$620K
177 prescriptions
Company payments, 2025
$3,500
From 1 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Katja Kiseljak-Vassiliades was code 99232 (hospital e&m - subsequent), 32 times for 11 patients. In total Katja Kiseljak-Vassiliades billed 107 services in 12 codes, and Medicare paid $8,843.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2012-08-30.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99232 Hospital E&M - Subsequent | Facility | 32 | 11 | $62.26 | $1,992 |
| 99215 Office E&M - Established | Facility | 18 | 14 | $97.54 | $1,756 |
By year: 2022 $3,303 for 49 services; 2023 $3,871 for 37 services; 2024 $8,843 for 107 services.
Medicare prescription drug claims, 2024
In 2024, the drug Katja Kiseljak-Vassiliades prescribed most often to Medicare patients was Prednisone, with 24 prescriptions and refills. In total Katja Kiseljak-Vassiliades wrote 177 Medicare prescriptions that cost $620K.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Prednisone Generic | 24 | 72 | Under 11 | $336 |
| Levothyroxine Sodium Generic | 23 | 69 | Under 11 | $211 |
| Isturisa Osilodrostat Phosphate | 16 | 16 | Under 11 | $565K |
| Sogroya Somapacitan-Beco | 12 | 12 | Under 11 | $17K |
Brand drugs: - claims; generic drugs: 119 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Katja Kiseljak-Vassiliades $3,500 ($3,500 in general payments such as food, travel and fees) from 1 company. The largest payer was Recordati_rare_diseases_inc. with $3,500.
| Company | Payments | Amount |
|---|---|---|
| Recordati_rare_diseases_inc. | 1 | $3,500 |
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.