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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.

LEWIS S BLUMENTHAL MD
NPI 1750366209
Obstetrics & Gynecology in Chicago, IL

Active since December 07, 2005
55 E WASHINGTON ST, SUITE 3700, CHICAGO, IL 60602(312) 263-5517(312) 263-5565 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Lewis S Blumenthal Md NPPES

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

LEWIS S BLUMENTHAL MD (NPI 1750366209) is an individual obstetrics & gynecology provider in Chicago, Illinois, licensed in Illinois (036059833) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1750366209
Entity TypeIndividualMale
Primary Taxonomy207V00000X
Provider Legal NameLEWIS S BLUMENTHALCredential: MD
Location Address55 E WASHINGTON ST, SUITE 3700Chicago, IL 60602-2103
Mailing Address55 E Washington St, Suite 3700Chicago, IL 60602-2103 · (312) 263-5517 · Fax (312) 263-5565
Phone(312) 263-5517
Fax(312) 263-5565
Sole ProprietorNo
Enumeration DateDecember 7, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1750366209 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in IL · 036059833
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
55 E WASHINGTON ST, Chicago, IL 60602
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Other Identifiers 1

Medicaid036059833IL

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.

SHARON PIETRZAK MA, LCPC, CCDVC
Counselor (Professional)
55 E WASHINGTON ST, SUITE 621
CHICAGO, IL 60602
Cook County (708) 293-0070
DR. GARY G WEGMANN DDS
Dentist
55 E WASHINGTON ST, SUITE 3601
CHICAGO, IL 60602
Cook County (312) 551-0500
JUSTIN EVAN TOBIN LCSW
Social Worker (Clinical)
55 E WASHINGTON ST, SUITE 2700
CHICAGO, IL 60602
Cook County (773) 308-3468
MR. DAVID LEE CIESLA MA, LCPC
Counselor (Professional)
55 E WASHINGTON ST, SUITE 2801
CHICAGO, IL 60602
Cook County (312) 208-9499
DR. JAY CALLAHAN PHD, LCSW
Social Worker (Clinical)
55 E WASHINGTON ST, SUITE 2801
CHICAGO, IL 60602
Cook County (312) 372-4823
MR. LAWRENCE MICHAEL RUFFOLO L.C.S.W.
Social Worker (Clinical)
55 E WASHINGTON ST, SUITE 2900
CHICAGO, IL 60602
Cook County (847) 338-2564
MADELINE MUECKE LCSW, BCD
Social Worker (Clinical)
55 E WASHINGTON ST, SUITE 3100
CHICAGO, IL 60602
Cook County (773) 929-7696
DR. CHRISTOPHER FORD CHOYKE DDS
Dentist (General Practice)
55 E WASHINGTON ST
CHICAGO, IL 60602
Cook County (312) 782-5291

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 Lewis Blumenthal's NPI number?

The NPI number for Lewis Blumenthal is 1750366209. It was assigned to this individual provider in the NPPES registry on December 7, 2005.

Where is Lewis Blumenthal located?

Lewis Blumenthal practices at 55 E Washington St Suite 3700, Chicago, IL 60602. The listed phone number is (312) 263-5517.

What is Lewis Blumenthal's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

When was this NPI record last updated?

The NPPES record for Lewis Blumenthal 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 28 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.