CHICAGO OPHTHALMOLOGY, P.C.
NPI 1275653263
Ophthalmology in Chicago, IL

Q: What is Chicago Ophthalmology, P.C.'s NPI number?

The NPI number for Chicago Ophthalmology, P.C. is 1275653263. It was assigned to this organization in the NPPES registry on March 31, 2007.

Q: What is Chicago Ophthalmology, P.C.'s specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Active since March 31, 2007

3000 N HALSTED ST, SUITE 501, CHICAGO, IL 60657(773) 935-2800(773) 935-2861 Get Directions Write a Review

NPPES record last updated: August 22, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Chicago Ophthalmology, P.c. NPPES

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

CHICAGO OPHTHALMOLOGY, P.C. (NPI 1275653263) is a healthcare organization registered as an ophthalmology in Chicago, Illinois and active in the NPI registry since March 2007. The organization lists Gregory Steven Doren, President, as its authorized official.

NPPES Registry Identity

NPI1275653263

Entity TypeOrganization

Primary Taxonomy207W00000X

Legal Business NameCHICAGO OPHTHALMOLOGY, P.C.

Location Address3000 N HALSTED ST, SUITE 501Chicago, IL 60657-5188

Mailing Address3000 N Halsted St, Suite 501Chicago, IL 60657-5188 · (773) 935-2800 · Fax (773) 935-2861

Phone(773) 935-2800

Fax(773) 935-2861

Organization SubpartNo

Authorized OfficialGregory Steven DorenPresident · (773) 935-2800

Enumeration DateMarch 31, 2007

Last NPPES UpdateAugust 22, 2020

✔ NPI 1275653263 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians

Taxonomy Code207W00000X

Definition

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

3000 N HALSTED ST, Chicago, IL 60657

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Other Identifiers 5

Other01620224IL · Bcbs Id Number

Other146050551101IL · Humana Id #

Other5237392IL · Aetna Id #

Other0000001274IL · Family Medical Network Id

OtherP00266736IL · Railroad Medicare Id #

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE 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)

Chicago Ophthalmology, P.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Chicago Ophthalmology, P.C., which bills Medicare for the services this clinician delivers.

Clinician (1)

Gregory Doren, M.D.

Ophthalmology

NPI 1851411847

3000 N HALSTED ST SUITE 501
Chicago, IL 60657

(773) 935-2800

✔ PECOS✔ Accepts MedicareSame address

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

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 Chicago Ophthalmology, P.C.'s NPI number?

The NPI number for Chicago Ophthalmology, P.C. is 1275653263. It was assigned to this organization in the NPPES registry on March 31, 2007.

Where is Chicago Ophthalmology, P.C. located?

Chicago Ophthalmology, P.C. is located at 3000 N Halsted St Suite 501, Chicago, IL 60657. The listed phone number is (773) 935-2800.

What is Chicago Ophthalmology, P.C.'s specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Chicago Ophthalmology, P.C. enrolled in Medicare?

Yes. Chicago Ophthalmology, P.C. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Chicago Ophthalmology, P.C.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Ophthalmology) reassigns their Medicare billing to Chicago Ophthalmology, P.C.. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Chicago Ophthalmology, P.C. was last updated on August 22, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.