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Dr. Greg Jun, MD

Dr. Greg Jun, MD

Internal Medicine*
25+ years of experience

Dr. Greg Jun, MD is an internist in Crystal Lake, IL and has over 25 years of experience in the medical field. He graduated from Northwestern University Feinberg School of Medicine in 1997. He is affiliated with Northwestern Medicine McHenry Hospital. He is accepting new patients.

3.1 Star Rating
Based on 15 reviews 3.1 Star Rating (15 reviews)

Practice

650 Dakota St Ste A Crystal Lake, IL 60012
(815) 455-6000

At a Glance

  • Area of Expertise
    Dr. Jun specializes in the area of Internal Medicine. • See board certifications
  • Practices at Top Hospital
    America's 100 Best Hospitals Award™ • See hospitals
  • Good Patient Care
    Patients said they had exceptional care at this hospital. • See hospitals
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Dr. Jun's Reviews

Likelihood to recommend Dr. Jun

3.1
15 ratings, 7 with a written review
5 star
47%
47%
4 star
7%
7%
3 star
0%
0%
2 star
7%
7%
1 star
40%
40%

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Appointments
My problem with this doctor is I only see him for my annual visit , when he tells me he wants a follow up appointment in a month his schedule is full, when I’m not feeling well all I ever get to see is a PA or Nurse and then I feel like they miss diagnose me and I have to go back again only to try a different medication, the villages health needs more DOCTORS not PA’s and Nurses
What went well
No results
What could be improved
  • Didn't trust the provider's decisions
2 others found this helpful
Helpful
Jan 04, 2023
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HORRIBLE!
What went well
No results
What could be improved
No results
Helpful
Bill & Diane Stift – Feb 24, 2020
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Dr. Greg Jun is the worst doctor I have ever been to. Had to see him 3 times in 1 week to get clearance for surgery. This was after being in the hospital on and off for 2 months. Reordered numerous tests that were done already. When you are on disability and only get1 check per month you need to keep medical expenses at a min. Then had to go for another pre OP visit so decided to see him one more time and he refused to see me. What an awesome doctor (NOT). So if you want to spend lots of money going to numerous appts that are not necessary then go see him. He doesn't care about the patients only about how much money he can make. Also on my 1st visit told him I had high blood pressure, he told me he couldn't diagnose it on the 1st visit but went for a 2nd visit and he was able to diagnose it. I worked in the medical field for 11 years and never heard of this ridiculousness.
What went well
No results
What could be improved
No results
4 others found this helpful
Helpful
Debra M Luzinski – Oct 29, 2019
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He's the best! Always listens. Great physician for my son!
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 other person found this helpful
Helpful
Carissa B – Sep 05, 2019
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Professional, knowledgeable and thorough. He took his time and answered all our questions, we felt completely comfortable and he has a great sense of humor, couldn’t ask for anymore.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
May 31, 2019
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Would ABSOLUTELY not recvommend. Dr. Jun is rude, condescending and non-accommodating. Worst experience I’ve ever had with a physician. He said There was a limit on how many of my medical concerns he would address in one visit. He called me a hypocondriact and said large painful bumps on my tongue and throat were nothing to worry about. I had to beg for a referral for an ENT. He didn’t even acknowledge the concussion or headwound from a day earlier. I reached my limit for that visit. Horrible.
What went well
No results
What could be improved
  • Office environment
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
4 others found this helpful
Helpful
IL – Jan 11, 2019
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He's very caring. He takes time to listen.
What went well
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
  • Difficult to schedule appointment
  • Staff wasn't friendly
1 other person found this helpful
Helpful
Kevin in Libertyville, IL – Apr 20, 2016
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Know Before You Go

About Me

biography

Dr. Greg Jun, MD is an internist in Crystal Lake, IL and has over 25 years of experience in the medical field. He graduated from Northwestern University Feinberg School of Medicine in 1997. He is affiliated with Northwestern Medicine McHenry Hospital. He is accepting new patients.

  • Internal Medicine

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • Luth Gen Hospital

    Residency Hospital, 2001

  • Northwestern University Feinberg School Of Medicine

    Medical School, 1997

  • Northwestern University Feinberg School Of Medicine

    Undergraduate School, 1993
American Board of Medical Specialties®
American Board of Internal Medicine®
- 
Internal Medicine
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. Information last updated March 29, 2025. To learn more about the difference between these sources, please refer to our FAQs.
Board actions foundState licensing board
Within the last year
Florida Board of Medicine
Within the last one to three years
Illinois Department of Financial and Professional Regulation

Healthgrades receives board action history for physicians and physician assistants. The information displayed here is sourced from independent information providers, such as state board websites, and may not be the most up-to-date information. Healthgrades makes no representations with respect to the accuracy of any information provided here and assumes no responsibility or liability for such information.

Learn more about medical license public record check

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  • Korean

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Locations

Practice

Ambassador Hospital Care LLC650 Dakota St Ste A Crystal Lake, IL 60012
1

Practice

Office779 Kristine Way The Villages, FL 32163
2
Unavail1050 Old Camp Rd The Villages, FL 32162
3
Office1020 Lake Sumter Lndg The Villages, FL 32162
4

Affiliated Hospitals

  • Northwestern Medicine McHenry Hospital

    4201 W Medical Center Dr
    McHenry, IL 60050
    Recipient of 33
    hospital awards

    America's 100 Best Hospitals Award™ (2025)

    Top 5% in the nation for consistently delivering clinical quality

    America's 250 Best Hospitals Award™ (2025, 2024, 2023)

    Top 5% in the nation for consistently delivering clinical quality

    View all awards

    How patients felt about the care they received at this hospital.

    88%
    Patients said they were given information about recovering at home

    4% higher than the national average

    79%
    Patients said that nurses always listened to them and explained things well

    4% higher than the national average

    View all patient feedback
Learn more about how Healthgrades measures Hospital Quality