Katja Kiseljak-Vassiliades, DO
Endocrinology, Diabetes & Metabolism Physician · Aurora, CO
Katja Kiseljak-Vassiliades, DO is an endocrinology, diabetes & metabolism physician with a practice address in Aurora, Colorado, and NPI 1043353840, issued on Feb 14, 2007. Check the license (Colorado DR47946, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Katja Kiseljak-Vassiliades
- Credential
- DO
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- DR47946 CO
Self-reported in NPPES; status is on the state search - Practice location
- 12605 E 16TH Ave, Aurora, CO 80045
- Phone
- (720) 848-0000
- Enumerated
- Feb 14, 2007
- Record last updated
- Aug 30, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120924000249); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 149 in Colorado → Look up another NPI →
Also registered at 12605 E 16TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Benjamin Aakre, MDAnesthesiology Physician1407140395
- Alec Aaronson, DOPsychiatry Physician1972065233
- Mona Abaza, MDOtolaryngology Physician1043313844
- Meagan AbbagnaroAnesthesiologist Assistant1851254262
- Jean Abbott, MDEmergency Medicine Physician1578672820
- Adam Abraham, MDInternal Medicine Physician1720178304
Verify Katja Kiseljak-Vassiliades in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR47946Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
177 Medicare Part D claims for 32 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone24 claims
- Levothyroxine Sodium23 claims
- Isturisa16 claims
- Sogroya12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 97.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $72.27
2 payments; by number, the most common kind was education; the largest payer was Novo Nordisk Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- University Physicians IncorporatedAurora, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katja Kiseljak-Vassiliades among 149 endocrinology, diabetes & metabolism physician records in Colorado
Katja Kiseljak-Vassiliades, DO is one of 149 endocrinology, diabetes & metabolism physician records with a practice address in Colorado. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 31% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2005 · median 2002 among the 106 with a school on file
- Record last updated2012 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Colorado
There are 149 endocrinology, diabetes & metabolism physician records in Colorado.
All 149 in Colorado → Every provider in Aurora → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Linda Barbour, MDAurora, CO 800451477656312
- Heather Brooks, MDAurora, CO 800451184637456
- Warren Capell, MDAurora, CO 800451447340021
- Marc-Andre Cornier, MDAurora, CO 800451770500522
- Boris Draznin, MDAurora, CO 800451881660488
- James Falko, MDAurora, CO 800451669460887
- Satish Garg, MDAurora, CO 800451447264767
- Whitney Goldner, MDAurora, CO 800451326096397
Common questions
What is Katja Kiseljak-Vassiliades, DO's NPI number?
Katja Kiseljak-Vassiliades, DO's National Provider Identifier (NPI) is 1043353840, issued on Feb 14, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Katja Kiseljak-Vassiliades, DO located?
The NPPES record lists a practice address at 12605 E 16TH Ave, Aurora, CO, 80045. Phone: (720) 848-0000. Providers update this record themselves, so call before visiting.
How can I verify Katja Kiseljak-Vassiliades, DO's license?
NPPES lists Colorado license number DR47946, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katja Kiseljak-Vassiliades, DO prescribe under Medicare Part D?
In 2024, Katja Kiseljak-Vassiliades, DO had 177 Medicare Part D claims for 32 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Katja Kiseljak-Vassiliades, DO's MIPS final score?
The 2023 MIPS final score is 97.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.