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

DR. VASILIOS KALAS MD PHD
NPI 1699302521
Internal Medicine - Gastroenterology in Winfield, IL

Q: What is Vasilios Kalas's NPI number?

The NPI number for Vasilios Kalas is 1699302521. It was assigned to this individual provider in the NPPES registry on March 23, 2020.

Q: What is Vasilios Kalas's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Vasilios Kalas was last updated on August 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.

Active since March 23, 2020PECOS Enrolled

25 N WINFIELD RD STE 420, WINFIELD, IL 60190(630) 682-8700(630) 352-5582 Get Directions Write a Review

NPPES record last updated: August 27, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Aug 27, 2026, Aug 8, 2024, Jun 23, 2020 and 1 more (4 updates tracked since 2020).

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About Dr. Vasilios Kalas Md Phd NPPES

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

DR. VASILIOS KALAS MD PHD (NPI 1699302521) is an individual gastroenterology provider in Winfield, Illinois, licensed in Illinois (036164255) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with Northwestern Memorial Hospital, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1699302521

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. VASILIOS KALASCredential: MD PHD

Location Address25 N WINFIELD RD STE 420Winfield, IL 60190-1379

Mailing Address25 N Winfield Rd Ste 420Winfield, IL 60190-1379 · (630) 682-8700 · Fax (630) 352-5582

Phone(630) 682-8700

Fax(630) 352-5582

Sole ProprietorNo

Medical School CMSWashington University School Of MedicineGraduated 2020

Enumeration DateMarch 23, 2020

Last NPPES UpdateAugust 27, 20264 updates tracked since enumeration

NPPES CertifiedAugust 27, 2026

✔ NPI 1699302521 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in IL · 036164255

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedInternal MedicineTaxonomy 207R00000X · License 1699302521 (IL)

Also ListedHospitalistTaxonomy 208M00000X · License 036164255 (IL)

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

25 N WINFIELD RD STE 420, Winfield, IL 60190

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Secondary Practice Location 1

Location 1675 N Saint Clair St Ste 18-200Chicago, IL 60611-5929 · Phone (312) 695-8630 · Fax (312) 695-2857

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Vasilios Kalas Md Phd 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 ID1254754500

PECOS Enrollment IDI20240802000486

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.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140281

Location251 E Huron StChicago, IL 60611 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60190 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

$137.43 typical visit price

range $59.81 – $181.38

Typical copayment $34.35 (range $14.95 – $45.34)

Most-billed visit code 99204

Established Patient

$105.07 typical visit price

range $19.15 – $147.12

Typical copayment $26.26 (range $4.78 – $36.78)

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 12

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

MRS. JUCY TIESENGA NP

Nurse Practitioner