LEON FOGELFELD M.D.
NPI 1699732305
Internal Medicine - Endocrinology, Diabetes & Metabolism in Chicago, IL

Q: What is Leon Fogelfeld's NPI number?

The NPI number for Leon Fogelfeld is 1699732305. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Q: What is Leon Fogelfeld's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Q: When was this NPI record last updated?

The NPPES record for Leon Fogelfeld was last updated on November 1, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.

Active since April 27, 2006PECOS EnrolledAccepts Medicare Assignment

1725 W HARRISON ST, SUITE 250, CHICAGO, IL 60612(312) 942-6163 Get Directions Write a Review

NPPES record last updated: November 1, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 1, 2023, Jul 23, 2022, Apr 23, 2021 (3 updates tracked since 2021).

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About Leon Fogelfeld M.d. NPPES

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

LEON FOGELFELD M.D. (NPI 1699732305) is an individual endocrinology, diabetes & metabolism provider in Chicago, Illinois, licensed in California (C175830) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (1975).

NPPES Registry Identity

NPI1699732305

Entity TypeIndividualMale

Primary Taxonomy207RE0101X

Provider Legal NameLEON FOGELFELDCredential: M.D.

Location Address1725 W HARRISON ST, SUITE 250Chicago, IL 60612-3841

Mailing Address1725 W Harrison St, Suite 250Chicago, IL 60612-3841 · (312) 942-6163

Phone(312) 942-6163

Sole ProprietorNo

Medical School CMSOtherGraduated 1975

Enumeration DateApril 27, 2006

Last NPPES UpdateNovember 1, 20233 updates tracked since enumeration

NPPES CertifiedNovember 1, 2023

✔ NPI 1699732305 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians

Taxonomy Code207RE0101X

Licenses✔ Licensed in CA · C175830✔ Licensed in IL · 036-078595

Definition

An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

1725 W HARRISON ST, Chicago, IL 60612

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Secondary Practice Locations 2

Location 1125 W Thousand Oaks Blvd Ste 300Thousand Oaks, CA 91360-4460 · Phone (805) 418-9100

Location 2300 Hillmont Ave Ste 502Ventura, CA 93003-1651 · Phone (805) 652-6222

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

Leon Fogelfeld 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 ID2769664226

PECOS Enrollment IDI20220809002317

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 Reassignments

Medicare enrollment records show Leon Fogelfeld reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rush University Medical Group

0.2 mi

Internal Medicine

1620 W HARRISON ST
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
2,169 clinicians in this Medicare group

NPI 1093819542 (312) 942-5000

Cook County

0.2 mi

Family Medicine

605 S WOLCOTT AVE, SUITE 605
Chicago, IL 60612

Reassigned Medicare billing, Illinois enrollment
1,047 clinicians in this Medicare group

NPI 1912063439 (312) 864-4649

County Of Ventura

1,763 mi

Community/Behavioral Health

1900 E LOS ANGELES AVE STE 100
Simi Valley, CA 93065

Reassigned Medicare billing, California enrollment
710 clinicians in this Medicare group

NPI 1013139658 (805) 577-1724

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

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

75 services51 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 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

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

Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553

DME-Other DME · category DE017N

3 suppliers29 claims29 services$175.53 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. MARTA BATUS MD

Internal Medicine (Medical Oncology)

1725 W HARRISON ST, SUITE 809
CHICAGO, IL 60612

Cook County (312) 563-2487

KM WILLIAMS MD SC

Clinic/Center (Ophthalmologic Surgery)

1725 W HARRISON ST, STE 910
CHICAGO, IL 60612

Cook County (312) 622-7320

KENNETH M BOYER M.D.

Pediatrics (Pediatric Infectious Diseases)

1725 W HARRISON ST, SUITE 710
CHICAGO, IL 60612

Cook County (312) 942-3034

RUSH UNIVERSITY MEDICAL CENTER

Internal Medicine (Hematology)

1725 W HARRISON ST, SUITE 1010
CHICAGO, IL 60612

Cook County (312) 942-5904

DAVID ANSELL M.D.

Internal Medicine

1725 W HARRISON ST, SUITE 263
CHICAGO, IL 60612

Cook County (312) 942-6700

MIDWEST NEUROPSYCHIATRIC ASSOC LTD

Specialist

1725 W HARRISON ST, SUITE 744
CHICAGO, IL 60612

Cook County (312) 942-0118

JANICE DIESCHBOURG M.D.

Radiology (Diagnostic Radiology)

1725 W HARRISON ST, SUITE 155
CHICAGO, IL 60612

Cook County (312) 563-3269

AFFILIATED UROLOGISTS, LTD

Specialist

1725 W HARRISON ST, SUITE 762
CHICAGO, IL 60612

Cook County (312) 563-3447

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 Leon Fogelfeld's NPI number?

The NPI number for Leon Fogelfeld is 1699732305. It was assigned to this individual provider in the NPPES registry on April 27, 2006.

Where is Leon Fogelfeld located?

Leon Fogelfeld practices at 1725 W Harrison St Suite 250, Chicago, IL 60612. The listed phone number is (312) 942-6163.

What is Leon Fogelfeld's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Leon Fogelfeld enrolled in Medicare?

Yes. Leon Fogelfeld 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 organizations bill Medicare for Leon Fogelfeld's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Leon Fogelfeld reassigns Medicare benefits to 3 organizations: Rush University Medical Group (Chicago, IL), Cook County (Chicago, IL) and County Of Ventura (Simi Valley, CA). Each 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 Leon Fogelfeld's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Leon Fogelfeld was last updated on November 1, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.