Gregory Allen Kaczmarczyk, M.D.
Family Medicine Physician · Aurora, CO
Gregory Allen Kaczmarczyk, M.D. is a family medicine physician with a practice address in Aurora, Colorado, and NPI 1790885820, issued on Sep 25, 2006. Check the license (Colorado DR.0031915, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Gregory Allen Kaczmarczyk
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- DR.0031915 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1421 S Potomac St Ste 320, Aurora, CO 80012
- Phone
- (303) 750-1920
- Enumerated
- Sep 25, 2006
- Record last updated
- Apr 22, 2026
- Fax
- (303) 750-0483
- Medicaid ID
- 9000167543 CO
- Medicare enrollment
- Enrolled (PECOS I20100923000849); accepts Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 1421 S Potomac St Ste 320
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Candace Bassett, PAPhysician Assistant1184118937
- Jennifer Benson-Feero, FNP-BCFamily Nurse Practitioner1235692492
- Dhruva Gulur, M.D.Family Medicine Physician1649407016
- Kara Lubieniecki, PA-CPhysician Assistant1245839992
- Mavis Owusu, RN,MSN, APRN,FNP-BCFamily Nurse Practitioner1861235400
- Larisa Ravdel, MDGeneral Practice Physician1407007461
Verify Gregory Allen Kaczmarczyk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0031915Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% more Medicare Part D claims than the average family medicine physician in 2024
5,139 Medicare Part D claims for 675 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 240 claims were for opioids.
Most prescribed
- Atorvastatin Calcium279 claims
- Levothyroxine Sodium259 claims
- Lisinopril173 claims
- Rosuvastatin Calcium159 claims
- Amlodipine Besylate158 claims
- Losartan Potassium156 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.
Bills Medicare through one group practice
- Optumcare Colorado Medical Group LLCColorado Springs, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
220 family medicine physician records list a practice address in Aurora
They are 220 of the 17,400 NPPES records with a practice address in Aurora, and 3,563 family medicine physician records in Colorado.
All 220 in Aurora → All 3,563 in Colorado → Every provider in Aurora →
Other family medicine physician records in Colorado
- Eric Abbott, D.O.Colorado Springs, CO1255522876
- John Abbott, D.O.Lamar, CO1255477790
- Rasha Abdelsalam, MDDenver, CO1891058467
- Baiju Abdulla, M.B.B.S.Colorado Springs, CO1316119076
- Nathalie Abisror, MDCastle Pines, CO1336634922
- Ashley Abrahamson, DOPueblo, CO1497324065
- Lara Abrahamson, MDFort Collins, CO1538145289
- Pamela Abrams, MDBroomfield, CO1073514188
- Hemamalini Achuthan, MDLakewood, CO1205982881
- Chris Adams, D.O.Limon, CO1144285248
Common questions
What is Gregory Allen Kaczmarczyk, M.D.'s NPI number?
Gregory Allen Kaczmarczyk, M.D.'s National Provider Identifier (NPI) is 1790885820, issued on Sep 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Allen Kaczmarczyk, M.D. located?
The NPPES record lists a practice address at 1421 S Potomac St Ste 320, Aurora, CO, 80012. Phone: (303) 750-1920. Providers update this record themselves, so call before visiting.
How can I verify Gregory Allen Kaczmarczyk, M.D.'s license?
NPPES lists Colorado license number DR.0031915, 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 Gregory Allen Kaczmarczyk, M.D. prescribe under Medicare Part D?
In 2024, Gregory Allen Kaczmarczyk, M.D. had 5,139 Medicare Part D claims for 675 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.