Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ilja Faibussowitsch, MD

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1740220193

Ilja Faibussowitsch, MD is registered under Pulmonary Disease in Chicago, Illinois. Qualified in 1991, 35 years ago. Practices with Respiratory, Critical Care and Sleep Specialists, LLC, a 9-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona and Illinois.

Years since qualifying
35
Licensed in
AZ, IL
In the registry since
2006
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

2800 N Sheridan Rd Ste 301
Chicago, IL 60657-6156
Phone: (773) 935-5556
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Additional practice locations (1)

  • 3155 E Southern Ave Ste 201, Mesa, AZ 85204-5521 — (480) 655-8040

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence 036094678 (IL)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 55021 (AZ)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 55021 (AZ)
Sleep Medicine (Internal Medicine) Physician Taxonomy 207RS0012X · Licence 55021 (AZ)

Record details

NPI number1740220193
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 7, 2006
Last updated in NPPESOctober 30, 2018

Medicare enrollment

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

Medicare specialtyPULMONARY DISEASE
Also practisesCRITICAL CARE (INTENSIVISTS)
Medical schoolOTHER
Graduated 1991 (35 years in practice)
Group practice Respiratory, Critical Care And Sleep Specialists, Llc — 9 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 patients554
Services billed 2,682 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 $1,439 69 payments · a meal or drink at a meeting or visit, not a fee
Consulting Fee $900 1 payment

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 Respiratory, Critical Care and Sleep Specialists, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Chicago