Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Lydia Elizabeth Issac, MD

Individual provider Cardiovascular Disease Physician · NPI 1679953954

Dr. Lydia Elizabeth Issac, MD is registered under Cardiovascular Disease (Cardiology) in Chicago, Illinois. Qualified in 2014, 12 years ago. Practices with Advocate Health and Hospitals Corporation, a 3,079-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
12
Licensed in
IL
In the registry since
2015
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2535 S Martin Luther King Dr
Chicago, IL 60616
Phone: (312) 842-7117
Fax: (312) 326-2102
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 9831 S Western Ave, Chicago, IL 60643-1740 — (773) 445-3500

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence 036-156634 (IL)

Record details

NPI number1679953954
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 2, 2015
Last updated in NPPESSeptember 2, 2025
Certification dateSeptember 2, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Group practice Advocate Health And Hospitals Corporation — 3079 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients796
Services billed 1,544 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $53 3 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Advocate Health and Hospitals Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3079 clinicians in the practice; 12 are shown here.

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