AARON J CLARK MD
NPI 1245791797
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Chicago, IL

Q: What is Aaron Clark's NPI number?

The NPI number for Aaron Clark is 1245791797. It was assigned to this individual provider in the NPPES registry on March 27, 2019.

Q: What is Aaron Clark's specialty?

The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.

Q: When was this NPI record last updated?

The NPPES record for Aaron Clark was last updated on July 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.

Active since March 27, 2019PECOS Enrolled

675 N SAINT CLAIR ST STE 19-100, CHICAGO, IL 60611(312) 664-3278(312) 695-5774 Get Directions Write a Review

NPPES record last updated: July 3, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 3, 2025, Jun 12, 2019 (2 updates tracked since 2019).

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About Aaron J Clark Md NPPES

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

AARON J CLARK MD (NPI 1245791797) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Chicago, Illinois, licensed in Illinois (036175284) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Northwestern Memorial Hospital, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1245791797

Entity TypeIndividualMale

Primary Taxonomy208G00000X

Provider Legal NameAARON J CLARKCredential: MD

Location Address675 N SAINT CLAIR ST STE 19-100Chicago, IL 60611-5969

Mailing Address251 E Huron StChicago, IL 60611-3055 · (312) 926-2000

Phone(312) 664-3278

Fax(312) 695-5774

Sole ProprietorNo

Medical School CMSIndiana University School Of MedicineGraduated 2019

Enumeration DateMarch 27, 2019

Last NPPES UpdateJuly 3, 20252 updates tracked since enumeration

NPPES CertifiedJuly 3, 2025

✔ NPI 1245791797 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyThoracic Surgery (Cardiothoracic Vascular Surgery)Allopathic & Osteopathic Physicians

Taxonomy Code208G00000X

Licenses✔ Licensed in IL · 036175284✔ Licensed in IL · 125.073748

Definition

A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.

675 N SAINT CLAIR ST STE 19-100, Chicago, IL 60611

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Secondary Practice Location 1

Location 1251 E Huron StChicago, IL 60611-3055 · Phone (312) 926-2000

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Nebraska, Oscar Insurance Company, Wellmark Health Plan of Iowa, Inc..Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Aaron J Clark Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7315271749

PECOS Enrollment IDI20250714003935

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 Reassignment

Medicare enrollment records show Aaron Clark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwestern Medical Faculty Foundation

35 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

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.

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140281

Location251 E Huron StChicago, IL 60611 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60611 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

$183.39 typical visit price

range $60.08 – $183.39

Typical copayment $45.84 (range $15.02 – $45.84)

Most-billed visit code 99205

Established Patient

$74.80 typical visit price

range $18.97 – $148.12

Typical copayment $18.70 (range $4.74 – $37.03)

Most-billed visit code 99213

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.

LAURA J DAVIDSON M.D.

Internal Medicine (Interventional Cardiology)