1. Home
  2. Directory
  3. Illinois
  4. Downers Grove
  5. Hospitalist
  6. NPI Profile

HAROON YOUSAF CHAUDHARY DO
NPI 1295027498
Hospitalist in Downers Grove, IL

Active since May 05, 2011PECOS EnrolledAccepts Medicare Assignment
3815 HIGHLAND AVE, DOWNERS GROVE, IL 60515(630) 275-3285(708) 346-8285 Get Directions Write a Review

NPPES record last updated: January 14, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 4, 2024, Sep 1, 2023, Apr 11, 2017 (3 updates tracked since 2017).

About Haroon Yousaf Chaudhary Do NPPES

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

HAROON YOUSAF CHAUDHARY DO (NPI 1295027498) is an individual hospitalist provider in Downers Grove, Illinois, licensed in Illinois (036137388) and active in the NPI registry since May 2011. He is enrolled in Medicare PECOS, is affiliated with Advocate Illinois Masonic Medical Center, and maintains a secondary practice location in Park Ridge.

NPPES Registry Identity

NPI1295027498
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameHAROON YOUSAF CHAUDHARYCredential: DO
Location Address3815 HIGHLAND AVEDowners Grove, IL 60515-1500
Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5922
Phone(630) 275-3285
Fax(708) 346-8285
Sole ProprietorYes
Medical School CMSOtherGraduated 2011
Enumeration DateMay 5, 2011
Last NPPES UpdateJanuary 14, 20253 updates tracked since enumeration
NPPES CertifiedJanuary 14, 2025
✔ NPI 1295027498 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
Licenses✔ Licensed in IL · 036137388✔ Licensed in WI · 2747-321
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.
3815 HIGHLAND AVE, Downers Grove, IL 60515
Open in Google Maps ↗

Secondary Practice Location 1

Location 11775 Dempster St Rm E592BPark Ridge, IL 60068-1143 · Phone (847) 723-8080 · Fax (847) 723-4378

Other Identifiers 1

Medicaid100240539WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource (Common Ground Healthcare).Insurance ›

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

Haroon Yousaf Chaudhary 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 ID5698080844
PECOS Enrollment IDI20150817001862, I20230628003440
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 Haroon Chaudhary reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Advocate Health And Hospitals Corporation
Same address
General Acute Care Hospital
3815 HIGHLAND AVE
Downers Grove, IL 60515
  • Reassigned Medicare billing, Illinois enrollment
  • 4,870 clinicians in this Medicare group
NPI 1578670543 (630) 275-5900
Aurora Medical Group, Inc.
81 mi
Nurse Anesthetist, Certified Registered
3301 W FOREST HOME AVE
Milwaukee, WI 53215
  • Reassigned Medicare billing, Wisconsin enrollment
  • 4,609 clinicians in this Medicare group
NPI 1427271378 (877) 576-3544

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 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
573 services220 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
162 services156 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
103 services98 patients
Advance care planning, first 30 minutes 99497
Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.
11 services11 patients

Hospital Affiliations CMS Care Compare 2

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

Advocate Illinois Masonic Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140182
Location836 West Wellington AvenueChicago, IL 60657 · Cook County
Emergency services Birthing friendly

Advocate Good Samaritan Hospital

Acute Care Hospitals · Downers Grove, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140288
Location3815 Highland AvenueDowners Grove, IL 60515 · Du Page County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60515 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
$137.43 typical visit price
range $59.81 – $181.38
Typical copayment $34.35 (range $14.95 – $45.34)
Most-billed visit code 99204
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
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 3

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

Hospital bed, semi-electric (head and foot adjustment), with any type side rails, with mattress E0260
DME-Hospital Beds · category DB000N
1 supplier14 claims14 services$48.17 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers22 claims22 services$64.62 avg. paid by Medicare
Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738
DME-Oxygen and Supplies · category DC000N
1 supplier12 claims12 services$32.23 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.

STEPHANIE WOLFF PA-C
Physician Assistant
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 275-5900
ABIGAIL MAZUREK
Physical Therapist
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 275-5900
DR. MICHAEL J IWANICKI D.O.
Surgery
3815 HIGHLAND AVE, TOWER 2, SUITE 107
DOWNERS GROVE, IL 60515
Dupage County (630) 275-7800
TRAUMA AND SURGICAL SPECIALISTS OF DUPAGE, LLC
Surgery
3815 HIGHLAND AVE, TOWER 2, SUITE 107
DOWNERS GROVE, IL 60515
Dupage County (630) 275-7800
DR. JUSTIN GRIFFITH MILLER M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 324-7913
ZACHARY JOHN BASTIAN M.D.
Anesthesiology
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 275-5900
MANISA BAKER APN
Clinical Nurse Specialist (Acute Care)
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 275-5900
MARY SUE DAILEY APRN
Clinical Nurse Specialist (Adult Health)
3815 HIGHLAND AVE
DOWNERS GROVE, IL 60515
Dupage County (630) 275-5900

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 Haroon Chaudhary's NPI number?

The NPI number for Haroon Chaudhary is 1295027498. It was assigned to this individual provider in the NPPES registry on May 5, 2011.

Where is Haroon Chaudhary located?

Haroon Chaudhary practices at 3815 Highland Ave, Downers Grove, IL 60515. The listed phone number is (630) 275-3285.

What is Haroon Chaudhary's specialty?

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

Is Haroon Chaudhary enrolled in Medicare?

Yes. Haroon Chaudhary 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 Haroon Chaudhary's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Haroon Chaudhary reassigns Medicare benefits to 2 organizations: Advocate Health And Hospitals Corporation (Downers Grove, IL) and Aurora Medical Group, Inc. (Milwaukee, WI). 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 Haroon Chaudhary's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Haroon Chaudhary accept?

Health plans from CareSource (Common Ground Healthcare) list Haroon Chaudhary as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Haroon Chaudhary affiliated with any hospitals?

According to CMS data, Haroon Chaudhary is affiliated with Advocate Illinois Masonic Medical Center and Advocate Good Samaritan Hospital.

When was this NPI record last updated?

The NPPES record for Haroon Chaudhary was last updated on January 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months 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.