Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Gregory Allen Kaczmarczyk, MD

Individual provider Family Medicine Physician · NPI 1790885820

Dr. Gregory Allen Kaczmarczyk, MD is a Family Practice in Aurora, Colorado. Graduated from Southern Illinois University School of Medicine in 1991, 35 years ago. Practices with Optumcare Colorado Medical Group LLC, a 190-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Colorado.

Years since qualifying
35
Trained at
Southern Illinois University School of Medicine
Licensed in
CO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1421 S Potomac St Ste 320
Aurora, CO 80012-4512
Phone: (303) 750-1920
Fax: (303) 750-0483
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence DR.0031915 (CO)

Record details

NPI number1790885820
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 25, 2006
Last updated in NPPESApril 22, 2026
Certification dateApril 22, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolSOUTHERN ILLINOIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Optumcare Colorado Medical Group Llc — 190 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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