Photo of Dr. John E. Croghan

Dr. John E. Croghan, MD

Concierge Internal Medicine physician, Winnetka, IL

Dedication Health
5.0 (10 reviews)

Dr. Croghan is a concierge internal medicine physician and one of the founders of Dedication Health, with fellowships in geriatric medicine and rheumatology.

719 Oak Street, Winnetka, IL 60093
At a glance
Practice model
Concierge
Board certification
Internal Medicine, Rheumatology and Geriatric Medicine
Access
Members get 24/7 physician access and same-day appointments

Facts on this page last checked October 2026. How we check doctors

About Dr. Croghan

Dr. Croghan earned his medical degree at Rush Medical College and completed his internal medicine residency at Loyola University Medical Center. He then finished a geriatric medicine fellowship at the Johns Hopkins University School of Medicine and a second fellowship in rheumatology at George Washington University Medical Center. The American Board of Internal Medicine certifies him in three areas: internal medicine, rheumatology and geriatric medicine.

He is one of the founders of Dedication Health, a concierge practice with offices in Winnetka and Northfield, Illinois. In 1995 he co-founded Extended Care Information Network, which helped improve the discharging process in more than 400 hospitals and nearly 5,000 post-acute care facilities. He also co-founded Third Opinion, a clinical trial matching company.

Membership and fees

Dedication Health is a concierge medicine practice.

Members can contact the physician any time by phone, text or email, and can book same-day appointments.

Membership also includes annual physicals with screenings broader than what Medicare and insurers cover.

Education and credentials

Degree
MD
Medical school
Rush Medical College
Residency
Internal Medicine, Loyola University Medical Center
Fellowship
Geriatric Medicine, Johns Hopkins University School of Medicine, and Rheumatology, George Washington University Medical Center
Board certification
American Board of Internal Medicine: Internal Medicine, Rheumatology and Geriatric Medicine
NPI
1790724060

Hospital and practice affiliations

Founder, Dedication Health
Co-founder, Third Opinion
Co-founded Extended Care Information Network in 1995

Location

719 Oak Street, Winnetka, IL 60093
Dedication Health practice page
Directions

Recognition and research

Media and books

Featured in a July 2017 Voyage Chicago interview about Dedication Health.

Patient reviews

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Write a review
Rated 5 out of 5

Great!

"Very professional care and consult."

FMDD UserJul 2024
Rated 5 out of 5

Awesome!

"Guided me in choosing the best treatment option."

FMDD UserJul 2024
Rated 5 out of 5

Amazing!

"Enlightened me about my condition."

FMDD UserJul 2024

Questions patients ask

Does Dr. Croghan offer a membership?

Dedication Health is a concierge medicine practice with membership. Members can get same-day appointments.

Is Dr. Croghan board certified?

The American Board of Internal Medicine certifies Dr. Croghan in internal medicine, rheumatology and geriatric medicine.

Where did Dr. Croghan train?

He earned his medical degree at Rush Medical College and completed his residency at Loyola University Medical Center. His fellowships were at the Johns Hopkins University School of Medicine and George Washington University Medical Center.

Where is Dr. Croghan's office?

Dedication Health has offices in Winnetka and Northfield, Illinois.

Does Dr. Croghan offer telehealth?

The practice offers telemedicine video visits.

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