Marc Porter
Internal Medicine β’ Evanston, IL
355 Ridge Ave
Evanston, IL 602023399
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
355 Ridge Ave
Evanston, IL 602023399
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in North Chicago, IL. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Open Payments general payments, program year 2025
All general payments: $266.90 across 2 records.
By nature of payment
- Food and Beverage: $266.90 across 2 records.
Reporting-company totals
- Penumbra, Inc.: $266.90 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
NPI first issued
2019
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Evanston and Illinois
178 active clinicians are listed under Internal Medicine with a practice address in Evanston, IL (7,245 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Evanston
14.6% of these 178 clinicians have the CMS telehealth indicator.
34.3% of these 178 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $19.20 in 2021 to $266.90 in 2025.
- 2021: $19.20
- 2025: $266.90
Sources: CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 β December 31, 2025): fewer than 11 records totaling $266.90.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Penumbra, Inc. |
Food and Beverage
Cash or cash equivalent
|
Indigo System | General | $149.15 |
| Penumbra, Inc. |
Food and Beverage
Cash or cash equivalent
|
Indigo System | General | $117.75 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2020-08-31NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 390200000X
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Secondary Practice Locations
3333 Green Bay Rd
North Chicago, IL 600643037
Phone: 6039385108
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Emergency Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Hospitalist
Anesthesiology
Doctor of Medicine (M.D.)
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Family Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 355 RIDGE AVE, EVANSTON, IL 602023399 (Tel: 8473164000)
Internal Medicine (license number reported to NPPES: IL 125076971)
NPI status registered as active in NPPES database
Registered at 3333 GREEN BAY RD, NORTH CHICAGO, IL 600643037 (Tel: 6039385108)
Registered at 3333 GREEN BAY RD, NORTH CHICAGO, IL 600643037 (Tel: 6039385108)
Recorded as MARC PORTER
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Evanston
- Dr. Paula Harvan, MD
- Dr. Esther Kwak, DO
- Dr. Smita Singh, MD
- Dr. Spencer Kiers, DO
- Dr. Mariamou Sims, MD
- Dr. Elizabeth Ward, MD
Mailing Address
3333 Green Bay Rd
North Chicago, IL 600643037
Phone: 6039385108