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LEONARD D ELKUN MD SC
NPI 1356446306
Psychiatry & Neurology - Geriatric Psychiatry in Chicago, IL

Active since September 14, 2006
411 W ONTARIO ST, SUITE 402, CHICAGO, IL 60610(312) 943-8322(312) 943-8323 Get Directions Write a Review

NPPES record last updated: April 24, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 24, 2021, Aug 22, 2020 (2 updates tracked since 2020).

About Leonard D Elkun Md Sc NPPES

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

LEONARD D ELKUN MD SC (NPI 1356446306) is a healthcare organization registered as a geriatric psychiatry in Chicago, Illinois and active in the NPI registry since September 2006. The organization lists Leonard David Elkun, President, as its authorized official.

NPPES Registry Identity

NPI1356446306
Entity TypeOrganization
Primary Taxonomy2084P0805X
Legal Business NameLEONARD D ELKUN MD SC
Location Address411 W ONTARIO ST, SUITE 402Chicago, IL 60610-6945
Mailing Address411 W Ontario St, Suite 402Chicago, IL 60610-6945 · (312) 943-8322 · Fax (312) 943-8323
Phone(312) 943-8322
Fax(312) 943-8323
Organization SubpartNo
Authorized OfficialLeonard David ElkunPresident · (312) 943-8322
Enumeration DateSeptember 14, 2006
Last NPPES UpdateApril 24, 20212 updates tracked since enumeration
NPPES CertifiedApril 24, 2021
✔ NPI 1356446306 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · Geriatric PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0805X
Definition
Geriatric Psychiatry is a subspecialty with psychiatric expertise in prevention, evaluation, diagnosis and treatment of mental and emotional disorders in the elderly, and improvement of psychiatric care for healthy and ill elderly patients.
Also ListedPsychiatry & Neurology · Neurology with Special Qualifications in Child NeurologyTaxonomy 2084N0402X
411 W ONTARIO ST, Chicago, IL 60610
Open in Google Maps ↗

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)

Leonard D Elkun Md Sc 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 Leonard D Elkun MD Sc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Leonard Elkun, MD
Psychiatry
NPI 1023129145
411 W. ONTARIO ST SUITE 402
Chicago, IL 60610
(312) 943-8322
✔ 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 Leonard D Elkun MD Sc's NPI number?

The NPI number for Leonard D Elkun MD Sc is 1356446306. It was assigned to this organization in the NPPES registry on September 14, 2006.

Where is Leonard D Elkun MD Sc located?

Leonard D Elkun MD Sc is located at 411 W Ontario St Suite 402, Chicago, IL 60610. The listed phone number is (312) 943-8322.

What is Leonard D Elkun MD Sc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Geriatric Psychiatry, with taxonomy code 2084P0805X.

Is Leonard D Elkun MD Sc enrolled in Medicare?

Yes. Leonard D Elkun MD Sc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Leonard D Elkun MD Sc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Psychiatry) reassigns their Medicare billing to Leonard D Elkun MD Sc. 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 Leonard D Elkun MD Sc was last updated on April 24, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.