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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.

AYAZ GEN DO
NPI 1508447061
Hospitalist in Chicago, IL

Active since April 16, 2021PECOS Enrolled
5145 N CALIFORNIA AVE, CHICAGO, IL 60625(773) 989-3833(773) 878-3753 Get Directions Write a Review

NPPES record last updated: October 20, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 2, 2025, Apr 16, 2021 (2 updates tracked since 2021).

About Ayaz Gen Do NPPES

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

AYAZ GEN DO (NPI 1508447061) is an individual hospitalist provider in Chicago, Illinois, licensed in Illinois (036171094) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS, is affiliated with Macneal Hospital, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1508447061
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameAYAZ GENCredential: DO
Location Address5145 N CALIFORNIA AVEChicago, IL 60625-3661
Mailing Address2650 Ridge Ave Ste 1223Evanston, IL 60201-1700 · (773) 878-8200
Phone(773) 989-3833
Fax(773) 878-3753
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateApril 16, 2021
Last NPPES UpdateOctober 20, 20262 updates tracked since enumeration
NPPES CertifiedOctober 20, 2026
✔ NPI 1508447061 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in IL · 036171094
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Also ListedInternal MedicineTaxonomy 207R00000X · License 036.171094 (IL)
Also ListedInternal Medicine · Critical Care MedicineTaxonomy 207RC0200X · License 036171094 (IL)
5145 N CALIFORNIA AVE, Chicago, IL 60625
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Other Names 1

Other Name (5)Ayaz Yunus Gen Do

Secondary Practice Location 1

Location 12751 W Winona StChicago, IL 60625-2508 · Phone (773) 878-8200

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

Ayaz Gen Do 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 ID5496268955
PECOS Enrollment IDI20250715002417
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

2

Medicare enrollment records show Ayaz Gen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Loyola University Medical Center
11 mi
General Practice
2160 S 1ST AVE
Maywood, IL 60153
  • Reassigned Medicare billing, Illinois enrollment
  • 1,138 clinicians in this Medicare group
NPI 1336159961 (708) 216-3215
Loyola Medical Group LLC
11 mi
General Practice
3249 OAK PARK AVE
Berwyn, IL 60402
  • Reassigned Medicare billing, Illinois enrollment
  • 211 clinicians in this Medicare group
NPI 1376041954 (708) 783-3125

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

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Macneal Hospital

Acute Care Hospitals · Berwyn, IL
2/5 CMS rating
OwnershipProprietary
CMS Certification Number140054
Location3249 South Oak Park AvenueBerwyn, IL 60402 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60625 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.

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.

IVAN ZRANTCHEV MD
Emergency Medicine
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 878-8200
AMC ANESTHESIA LTD
Anesthesiology
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 878-8200
GLORIA NEZIANYA APN-CNP
Nurse Practitioner
5145 N CALIFORNIA AVE, STE M276
CHICAGO, IL 60625
Cook County (773) 878-8200
KAYLA ARLENE BALOUSEK MD
Emergency Medicine
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 878-8200
JULIE I FRITZ PA
Physician Assistant
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 989-3800
DR. ARTEMIS KHOJASTEH M.D.
Emergency Medicine
5145 N CALIFORNIA AVE, DEPARTMENT OF EMERGENCY MEDICINE
CHICAGO, IL 60625
Cook County (773) 878-8200
WILMER FERNANDO DAVILA M.D.
Anesthesiology
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 293-5486
CASEY JOHN TOOLE DO
Emergency Medicine
5145 N CALIFORNIA AVE
CHICAGO, IL 60625
Cook County (773) 878-8200

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 Ayaz Gen's NPI number?

The NPI number for Ayaz Gen is 1508447061. It was assigned to this individual provider in the NPPES registry on April 16, 2021. The provider is also known as Ayaz Yunus Gen Do.

Where is Ayaz Gen located?

Ayaz Gen practices at 5145 N California Ave, Chicago, IL 60625. The listed phone number is (773) 989-3833.

What is Ayaz Gen's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Ayaz Gen enrolled in Medicare?

Yes. Ayaz Gen 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 Ayaz Gen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ayaz Gen reassigns Medicare benefits to 2 organizations: Loyola University Medical Center (Maywood, IL) and Loyola Medical Group LLC (Berwyn, IL). 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 Ayaz Gen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Ayaz Gen affiliated with any hospitals?

According to CMS data, Ayaz Gen is affiliated with Macneal Hospital.

When was this NPI record last updated?

The NPPES record for Ayaz Gen was last updated on October 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.