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

DR. GREGORY PATRICK VELDHUIZEN MD, PHD
NPI 1790589539
Internal Medicine in Chicago, IL

Active since April 02, 2025PECOS Enrolled
5840 S MARYLAND AVE, CHICAGO, IL 60637(773) 702-1447 Get Directions Write a Review

NPPES record last updated: September 24, 2026. Verified against the NPPES registry weekly; last sync: October 04, 2026.

Record update history: Sep 24, 2026, Apr 2, 2025 (2 updates tracked since 2025).

About Dr. Gregory Patrick Veldhuizen Md, Phd NPPES

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

DR. GREGORY PATRICK VELDHUIZEN MD, PHD (NPI 1790589539) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (125085478) and active in the NPI registry since April 2025. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1790589539
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. GREGORY PATRICK VELDHUIZENCredential: MD, PHD
Location Address5840 S MARYLAND AVEChicago, IL 60637-1462
Mailing Address180 Harvester Dr Ste 110Burr Ridge, IL 60527-6686 · (773) 702-1150
Phone(773) 702-1447
Sole ProprietorYes
Enumeration DateApril 2, 2025
Last NPPES UpdateSeptember 24, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 24, 2026
✔ NPI 1790589539 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in IL · 125085478
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
5840 S MARYLAND AVE, Chicago, IL 60637
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gregory Patrick Veldhuizen Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60637 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
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
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 3

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

DR. ROBERT FONG II MD, PHD
Anesthesiology
5840 S MARYLAND AVE, MC4028
CHICAGO, IL 60637
Cook County (773) 702-6700
TRACY GAIL PESSIN M.D.
Anesthesiology
5840 S MARYLAND AVE, UCMC DEPARTMENT OF ANESTHESIA AND CRITICAL CARE; MC4028
CHICAGO, IL 60637
Cook County (773) 702-6700
KEITH RODRIGUEZ M.D.
Anesthesiology
5840 S MARYLAND AVE, MC4028
CHICAGO, IL 60637
Cook County (773) 702-6700

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Veldhuizen's NPI number?

The NPI number for Gregory Veldhuizen is 1790589539. It was assigned to this individual provider in the NPPES registry on April 2, 2025.

Where is Gregory Veldhuizen located?

Gregory Veldhuizen practices at 5840 S Maryland Ave, Chicago, IL 60637. The listed phone number is (773) 702-1447.

What is Gregory Veldhuizen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Gregory Veldhuizen enrolled in Medicare?

Yes. Gregory Veldhuizen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Gregory Veldhuizen was last updated on September 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.