DR. GREG DONALD EWERT M.D.
NPI 1376591974
Internal Medicine in Chicago, IL

Q: What is Greg Ewert's NPI number?

The NPI number for Greg Ewert is 1376591974. It was assigned to this individual provider in the NPPES registry on May 5, 2006.

Q: What is Greg Ewert's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Greg Ewert was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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 May 05, 2006PECOS EnrolledAccepts Medicare Assignment

200 S MICHIGAN AVE, SUTIE 805, CHICAGO, IL 60604(312) 922-3815(312) 922-3789 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Greg Donald Ewert M.d. NPPES

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

DR. GREG DONALD EWERT M.D. (NPI 1376591974) is an individual internal medicine provider in Chicago, Illinois and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS, is affiliated with Northwestern Lake Forest Hospital, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1986).

NPPES Registry Identity

NPI1376591974

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. GREG DONALD EWERTCredential: M.D.

Location Address200 S MICHIGAN AVE, SUTIE 805Chicago, IL 60604-2402

Mailing Address200 S Michigan Ave, Sutie 805Chicago, IL 60604-2402 · (312) 922-3815 · Fax (312) 922-3789

Phone(312) 922-3815

Fax(312) 922-3789

Sole ProprietorNo

Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 1986

Enumeration DateMay 5, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1376591974 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

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.

200 S MICHIGAN AVE, Chicago, IL 60604

Open in Google Maps ↗

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. Greg Donald Ewert 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 ID5799729331

PECOS Enrollment IDI20101215000421

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 Reassignment

Medicare enrollment records show Greg Ewert reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Greg D Ewert MD Sc

Same address

Adolescent Medicine

200 S MICHIGAN AVE, SUITE 805
Chicago, IL 60604

Reassigned Medicare billing, Illinois enrollment

NPI 1679969182 (312) 922-3815

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 8

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.

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

122 services88 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

100 services91 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.

76 services51 patients

Automated urinalysis test 81003

An automated urinalysis test is a routine examination that checks your urine for various substances. It can help identify potential health issues such as kidney problems or diabetes. The test uses a machine to analyze a small urine sample, providing quick and accurate results.

62 services61 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.

57 services57 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

57 services57 patients

Hospital Affiliations CMS Care Compare 3

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

Northwestern Lake Forest Hospital

Acute Care Hospitals · Lake Forest, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140130

Location1000 N Westmoreland RoadLake Forest, IL 60045 · Lake County

Emergency services Birthing friendly

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140242

Location25 North Winfield RoadWinfield, IL 60190 · Du Page County

Emergency services Birthing friendly

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 60604 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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Tubing with integrated heating element for use with positive airway pressure device A4604

DME-Other DME · category DE001N

6 suppliers12 claims12 services$34.64 avg. paid by Medicare

Filter, disposable, used with positive airway pressure device A7038

DME-Other DME · category DE001N

6 suppliers14 claims59 services$1.77 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

DR. ELAINE LEBOFF-RIES M.D.

Internal Medicine

200 S MICHIGAN AVE, SUITE 805
CHICAGO, IL 60604

Cook County (312) 922-3815

GOLDSTEIN NEUROPSYCHOLOGISTS PC

Clinical Neuropsychologist

200 S MICHIGAN AVE, SUITE 710
CHICAGO, IL 60604

Cook County (312) 212-1776

TERENCE P SULLIVAN MD

Internal Medicine

200 S MICHIGAN AVE, STE 830
CHICAGO, IL 60604

Cook County (312) 922-2500

STEVEN J. DEANGELES, M.D., S.C.

Internal Medicine

200 S MICHIGAN AVE, SUITE 830
CHICAGO, IL 60604

Cook County (312) 922-2500

DR. ANGELO ANDREW COSTAS M.D.

Internal Medicine

200 S MICHIGAN AVE, SUITE 805
CHICAGO, IL 60604

Cook County (312) 922-3815

DR. WENDY CAROLYN GOODALL MCDONALD MD

Obstetrics & Gynecology

200 S MICHIGAN AVE, SUITE 1550
CHICAGO, IL 60604

Cook County (312) 263-5517

DR. THERESA WANG D.D.S.

Dentist

200 S MICHIGAN AVE, SUITE 1400
CHICAGO, IL 60604

Cook County (312) 939-8990

DR. STEVEN J DEANGELES MD

Internal Medicine

200 S MICHIGAN AVE, SUITE 830
CHICAGO, IL 60604

Cook County (312) 922-2500

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 Greg Ewert's NPI number?

The NPI number for Greg Ewert is 1376591974. It was assigned to this individual provider in the NPPES registry on May 5, 2006.

Where is Greg Ewert located?

Greg Ewert practices at 200 S Michigan Ave Sutie 805, Chicago, IL 60604. The listed phone number is (312) 922-3815.

What is Greg Ewert's specialty?

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

Is Greg Ewert enrolled in Medicare?

Yes. Greg Ewert is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Greg Ewert's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Greg Ewert reassigns Medicare benefits to Greg D Ewert MD Sc (Chicago, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Greg Ewert's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Greg Ewert affiliated with any hospitals?

According to CMS data, Greg Ewert is affiliated with Northwestern Lake Forest Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Greg Ewert was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.