NPIMap

Individual provider Active NPI

Gregory Allen Kaczmarczyk, M.D.

  • Family Medicine Physician
  • Aurora, CO
National Provider Identifier
1790885820
Registry record updated Sep 24, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Family Medicine PhysicianTaxonomy code 207Q00000X
License
DR.0031915 Issued in CO
Practice address
1421 S Potomac St Ste 320
Aurora, CO 80012-4512
Phone
(303) 750-1920
Fax
(303) 750-0483
NPI assigned
Sep 25, 2006
Last updated
Sep 24, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 24, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Family Medicine Physician 207Q00000X DR.0031915 CO Primary

Addresses

Primary practice location

1421 S Potomac St Ste 320
Aurora, CO 80012-4512

Mailing address

PO Box 35380
Las Vegas, NV 89133-5380
Phone (702) 579-3253

Other identifiers 1

IdentifierTypeStateIssuer
9000167543MedicaidCO

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CO
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20100923000849 CO Practitioner - Family Practice 7719013663 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Family Practice
Education
Southern Illinois University School of Medicine, 1991
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices

Practice addresses (Care Compare)

Colorado Springs, CO 80903
Phone (719) 538-2900

1421 S Potomac St
Suite 320
Aurora, CO 80012-4512
Phone (702) 480-2550

1625 Medical Ctr PT
Suite 290
Colorado Springs, CO 80907-8722
Phone (719) 635-5148

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

Practice roles

OrganizationSpecialtyStatusNew patients
Optumcare Colorado Medical Group LLC Current Accepting new patients
New West Physicians Inc Family Medicine CurrentSince Aug 12, 2022 Accepting new patients
Optumcare Colorado Medical Group LLC CurrentSince Mar 1, 2024 Accepting new patients
Optumcare Colorado Medical Group LLC CurrentSince Mar 1, 2024 Accepting new patients
Optumcare Colorado Medical Group LLC Family Medicine Past Accepting new patients

Locations

7950 Kipling St
Ste 101
Arvada, CO 80005
Phone (303) 425-4680

1421 S Potomac St
Ste 320
Aurora, CO 80012
Phone (303) 750-1920

1625 Medical Center Pt
Ste 290
Colorado Springs, CO 80907
Phone (719) 635-5148

4301 Lowell Blvd
Denver, CO 80211
Phone (303) 455-3661

1707 Cole Blvd
Ste 100
Lakewood, CO 80401
Phone (303) 716-8013

Interoperability endpoints

  • Direct secure messaging: gkaczmarczyk120934@westdirect.optum.com

Organizations & group practices 5

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 11

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1159142400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790208000000",
    "number": "1790885820",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35380",
            "city": "LAS VEGAS",
            "state": "NV",
            "postal_code": "891335380",
            "telephone_number": "702-579-3253"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1421 S POTOMAC ST STE 320",
            "city": "AURORA",
            "state": "CO",
            "postal_code": "800124512",
            "telephone_number": "303-750-1920",
            "fax_number": "303-750-0483"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "KACZMARCZYK",
        "first_name": "GREGORY",
        "middle_name": "ALLEN",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-09-25",
        "last_updated": "2026-09-24",
        "certification_date": "2026-09-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "CO",
            "license": "DR.0031915",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "9000167543",
            "state": "CO"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Aurora, CO

Sources for this page

Verify at the official NPI Registry.