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MICHIGAN AVENUE INTERNISTS
NPI 1922066588
Internal Medicine in Chicago, IL

Active since May 03, 2006CLIA 14D0694244 · Waiver
200 S MICHIGAN AVE, SUITE 805, CHICAGO, IL 60604(312) 922-3815(312) 922-3789 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 11, 2025, Jul 21, 2022, Aug 22, 2020 and 1 more (4 updates tracked since 2018).

About Michigan Avenue Internists NPPES

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

MICHIGAN AVENUE INTERNISTS (NPI 1922066588) is a healthcare organization registered as an internal medicine in Chicago, Illinois and active in the NPI registry since May 2006. The organization holds a CLIA Waiver certificate valid through March 21, 2028 and lists Greg Donald Ewert, President, as its authorized official.

NPPES Registry Identity

NPI1922066588
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameMICHIGAN AVENUE INTERNISTS
Location Address200 S MICHIGAN AVE, SUITE 805Chicago, IL 60604-2402
Mailing Address200 S Michigan Ave, Suite 805Chicago, IL 60604-2402 · (312) 922-3815 · Fax (312) 922-3789
Phone(312) 922-3815
Fax(312) 922-3789
Organization SubpartNo
Authorized OfficialGreg Donald EwertPresident · (312) 922-3815
Enumeration DateMay 3, 2006
Last NPPES UpdateSeptember 11, 20254 updates tracked since enumeration
✔ NPI 1922066588 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ 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.
Also ListedDermatologyTaxonomy 207N00000X

Other Identifiers 1

Other01605414IL · Bc/bs Of Illinois #

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michigan Avenue Internists is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

14

Medicare enrollment records show 14 clinicians reassign Medicare billing to Michigan Avenue Internists, which bills Medicare for the services they deliver. They are listed nearest first.

Clinicians by Medicare Specialty 2

Internal Medicine13
Nurse Practitioner1

Clinicians, nearest first (14)

Sheila Ballintine, M.D.
Internal Medicine
NPI 1467794859
200 S MICHIGAN AVE SUITE 805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Caroline Canning
Internal Medicine
NPI 1780168641
1620 W HARRISON ST
Chicago, IL 60612
(312) 942-5000
✔ PECOS✔ Accepts Medicare
Amy Chen, MD
Internal Medicine
NPI 1154663532
200 S MICHIGAN AVE STE 1400
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Sean Connolly, M.D.
Internal Medicine
NPI 1346602877
1000 N WESTMORELAND RD
Lake Forest, IL 60045
(847) 234-5600
✔ PECOS✔ Accepts Medicare
Ami Desai, M.D.
Internal Medicine
NPI 1710097795
200 S MICHIGAN AVE STE 805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Vivien Goh, MD
Internal Medicine
NPI 1730641762
251 E HURON ST
Chicago, IL 60611
(312) 926-2000
✔ PECOS✔ Accepts Medicare
Louis Hiotis, M.D.
Internal Medicine
NPI 1710980339
200 S. MICHIGAN AVENUE #805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Laura Lombard, MD
Internal Medicine
NPI 1487200697
251 E HURON ST
Chicago, IL 60611
(312) 926-2000
✔ PECOS✔ Accepts Medicare
Evan Ng, M.D.
Internal Medicine
NPI 1518141720
200 S MICHIGAN AVE SUITE 805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Steven Paterakos, DO
Internal Medicine
NPI 1255892741
200 S MICHIGAN AVE STE 1400
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Bradley Sabin, M.D.
Internal Medicine
NPI 1922277292
251 E HURON ST GALTER PAVILLION SUITE 3-150
Chicago, IL 60611
(312) 926-4227
✔ PECOS✔ Accepts Medicare
Shirley Termolen, M.D.
Internal Medicine
NPI 1952369563
200 S MICHIGAN AVE SUITE 805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
David Vermylen, M.D.
Internal Medicine
NPI 1467773986
200 S MICHIGAN AVE SUITE 805
Chicago, IL 60604
(312) 922-3815
✔ PECOS✔ Accepts Medicare
Natalie Zimmer, FNP-BCC
Nurse Practitioner
NPI 1528580917
870 N MILWAUKEE AVE
Vernon Hills, IL 60061
(847) 475-2273
✔ PECOS✔ Accepts Medicare

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 14D0694244

Michigan Avenue Internists LLC · Chicago, IL
Active · expires Mar 21, 2028
CLIA Number14D0694244
Laboratory TypePhysician Office
Certificate Effective DateMarch 22, 2026
Certificate Expiration DateMarch 21, 2028
Laboratory DirectorShirley Ter Molen MD
Laboratory Phone(312) 922-1287
Laboratory LocationMichigan Avenue Internists LLC200 South Michigan Suite #805, Chicago, IL 60604
CLIA data matches this NPI record on: Name
This certificate is issued to a laboratory to perform only waived tests.

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 Michigan Avenue Internists's NPI number?

The NPI number for Michigan Avenue Internists is 1922066588. It was assigned to this organization in the NPPES registry on May 3, 2006.

Where is Michigan Avenue Internists located?

Michigan Avenue Internists is located at 200 S Michigan Ave Suite 805, Chicago, IL 60604. The listed phone number is (312) 922-3815.

What is Michigan Avenue Internists's specialty?

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

Is Michigan Avenue Internists enrolled in Medicare?

Yes. Michigan Avenue Internists is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Michigan Avenue Internists?

According to the CMS Revalidation Reassignment List (October 2026 release), 14 clinicians in 2 Medicare specialties reassign their Medicare billing to Michigan Avenue Internists. A 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 the clinician's services. The largest specialties are Internal Medicine (13) and Nurse Practitioner (1). Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Michigan Avenue Internists hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 14D0694244) is associated with this NPI, valid through March 21, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Michigan Avenue Internists was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.