Dr. Ruheri A Perez-Tamayo, MD, PHD

Individual provider Surgical Critical Care Physician · NPI 1881655397

Dr. Ruheri A Perez-Tamayo, MD, PHD practises Cardiac Surgery in McHenry, Illinois. Qualified in 1990, 36 years ago. Practices with Loyola University Medical Center, a 946-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying: 36
Licensed in: IL
In the registry since: 2006
Specialties on file: 2

What do these letters mean?

MD — Doctor of Medicine: A physician who completed allopathic medical school.
PHD — Doctor of Philosophy: A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

4309 Medical Center Dr Ste A200
McHenry, IL 60050
Phone: (815) 759-4699
Fax: (815) 759-8938

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

1205 S Main St Ste 101, Crown Point, IN 46307-3677 — (219) 662-0077

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary)	Taxonomy 208G00000X · Licence 036100023 (IL)
Surgical Critical Care Physician	Taxonomy 2086S0102X · Licence 036100023 (IL)

Record details

NPI number	1881655397
Entity type	Individual (Type 1)
Gender	Male
Credentials	MD , PHD
Sole proprietor	No
NPI enumerated	April 1, 2006
Last updated in NPPES	February 4, 2022
Certification date	February 4, 2022

Medicare enrollment

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

Medicare specialty	CARDIAC SURGERY
Also practises	CRITICAL CARE (INTENSIVISTS), GENERAL SURGERY, THORACIC SURGERY, VASCULAR SURGERY
Medical school	OTHER
Graduated	1990 (36 years in practice)
Group practice	Loyola University Medical Center — 946 clinicians
Accepts Medicare assignment	Yes — accepts the Medicare-approved amount
Practice locations	3 on file with Medicare

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 patients	43
Services billed	61 a service is one billed item, such as a visit, a test or a procedure
Average patient age	79

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.

Consulting Fee	$625 1 payment
Food and Beverage	$100 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.

Loyola University Medical Center Hospital · Maywood, IL

Colleagues at Loyola University Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 946 clinicians in the practice; 12 are shown here.

Malek Akhal, MD Family Medicine Physician · Maywood, IL
Dr. Susanna Coers Byram, MD, PHD Anesthesiology Physician · Maywood, IL
Nina M. Clark Infectious Disease Physician · Maywood, IL
Tyler David Cohn, MD Surgery Physician · Maywood, IL
Dr. Carlos Manuel De Castro IV, MD Diagnostic Radiology Physician · Maywood, IL
Agnes M Hurtuk, MD Otolaryngology Physician · Maywood, IL
Dr. Mohammed Abrar Hussain, DO Anesthesiology Physician · Maywood, IL
Neeraj Joshi Student in an Organized Health Care Education/Training Program · Maywood, IL
Chantal R Reyna, MD Surgical Oncology Physician · Maywood, IL
Sean Duane Ruland Neurology Physician · Chicago, IL
Shehla Sheikh, MD Internal Medicine Physician · Fort Wayne, IN
Mrs. Diane Katherine Vent, RN, NP-C Gerontology Nurse Practitioner · Chicago, IL