Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GREGORY ALLEN KACZMARCZYK M.D.
NPI 1790885820
Family Medicine in Aurora, CO

Q: What is Gregory Kaczmarczyk's NPI number?

The NPI number for Gregory Kaczmarczyk is 1790885820. It was assigned to this individual provider in the NPPES registry on September 25, 2006.

Q: What is Gregory Kaczmarczyk's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Active since September 25, 2006PECOS EnrolledAccepts Medicare Assignment

1421 S POTOMAC ST STE 320, AURORA, CO 80012(303) 750-1920(303) 750-0483 Get Directions Write a Review

NPPES record last updated: September 24, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 24, 2026, Apr 22, 2026, Dec 2, 2024 and 1 more (4 updates tracked since 2024).

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About Dr. Gregory Allen Kaczmarczyk M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY ALLEN KACZMARCZYK M.D. (NPI 1790885820) is an individual family medicine provider in Aurora, Colorado, licensed in Colorado (DR.0031915) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of Southern Illinois University School Of Medicine (1991).

NPPES Registry Identity

NPI1790885820

Entity TypeIndividualMale

Primary Taxonomy207Q00000X

Provider Legal NameDR. GREGORY ALLEN KACZMARCZYKCredential: M.D.

Location Address1421 S POTOMAC ST STE 320Aurora, CO 80012-4512

Mailing AddressPo Box 35380Las Vegas, NV 89133-5380 · (702) 579-3253

Phone(303) 750-1920

Fax(303) 750-0483

Sole ProprietorNo

Medical School CMSSouthern Illinois University School Of MedicineGraduated 1991

Enumeration DateSeptember 25, 2006

Last NPPES UpdateSeptember 24, 20264 updates tracked since enumeration

NPPES CertifiedSeptember 24, 2026

✔ NPI 1790885820 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in CO · DR.0031915

Definition

Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

1421 S POTOMAC ST STE 320, Aurora, CO 80012

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Other Identifiers 1

Medicaid9000167543CO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregory Allen Kaczmarczyk M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7719013663

PECOS Enrollment IDI20100923000849

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Gregory Kaczmarczyk reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

New West Physicians Inc

1.4 mi

Family Medicine

2230 S FRASER ST UNIT 1
Aurora, CO 80014

Reassigned Medicare billing, Colorado enrollment
142 clinicians in this Medicare group

NPI 1528676517 (303) 341-4200

Optumcare Colorado Medical Group LLC

18 mi

Family Medicine

1707 COLE BLVD STE 100
Golden, CO 80401

Reassigned Medicare billing, Colorado enrollment
314 clinicians in this Medicare group

NPI 1992562441 (303) 763-4900

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

154 services90 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

80 services63 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

65 services65 patients

Influenza vaccine, inactivated 90653

The Influenza vaccine, inactivated, is a shot given to protect against the flu. It contains killed virus particles that help your body build immunity to the flu. It's recommended annually to keep your protection up-to-date. It's safe for ages 6 months and up.

19 services19 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

17 services16 patients

Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677

The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.

12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80012 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$89.43 typical visit price

range $58.06 – $174.82

Typical copayment $22.35 (range $14.51 – $43.70)

Most-billed visit code 99203

Established Patient

$102.03 typical visit price

range $18.88 – $142.79

Typical copayment $25.50 (range $4.72 – $35.69)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 7

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NEW WEST PHYSICIANS INC

Family Medicine