background
background
Dr. William Sim, MD

Dr. William Sim, MD

Internal Medicine*
30+ years of experience

Dr. William Sim, MD is an internist in Downey, CA and has over 30 years of experience in the medical field. He graduated from Stanford University School of Medicine in 1990. He is affiliated with medical facilities PIH Health Whittier Hospital and PIH Health Downey Hospital. He is accepting new patients and telehealth appointments.

4.3 Star Rating
Based on 41 reviews 4.3 Star Rating (41 reviews)

Practice

11480 Brookshire Ave Ste 200 Downey, CA 90241
Telehealth available

Experience Check

Search for experience in a specific area

Dr. Sim's Reviews

Likelihood to recommend Dr. Sim

4.3

41 ratings, 18 with a written review
5 Star
78%
78%
4 Star
5%
5%
3 Star
0%
0%
2 Star
0%
0%
1 Star
17%
17%

Your trust is our top concern. Learn more.

We monitor all reviews to ensure they comply with our guidelines and don’t include personal information, profanity, libel, defamation, harassment, obscenity or fraud.

All reviews are confirmed and audited before publication, and community members have the ability to flag inappropriate content for further review by our team.

Doctors can not pay for good reviews, nor can they pay to have negative reviews removed.

Any reviews that are deemed fraudulent or violate our guidelines will be removed immediately.

RecentHighestLowestMost Helpful
What went well
  • Staff friendliness
What could be improved
  • I didn't feel respected
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
Helpful
Brenda bee – Feb 12, 2025
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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
Adriana M – Nov 30, 2022
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Amanda – Sep 21, 2021
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
1 person found this helpful
Helpful
Joe – Jun 25, 2021
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Sep 23, 2020
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Listened & answered questions
  • Explained conditions well
  • Trusted the provider's decisions
What could be improved
No results
1 person found this helpful
Helpful
Ekaterina – Sep 11, 2020
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Trusted the provider's decisions
What could be improved
No results
1 person found this helpful
Helpful
Steve T – Sep 11, 2020
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
  • Staff wasn't friendly
1 person found this helpful
Helpful
Nov 21, 2019
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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
5 people found this helpful
Helpful
CA – Oct 19, 2018
×Post a ResponseAre you Dr. William Sim, MD?
What went well
No results
What could be improved
  • Long wait times
3 people found this helpful
Helpful
Kevin in Norwalk, CA – Jul 10, 2018
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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
2 people found this helpful
Helpful
Kimber Miller in Whittier, CA – May 29, 2018
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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 person found this helpful
Helpful
rick – Jan 25, 2018
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
3 people found this helpful
Helpful
Joyce in Downey, CA – Jul 26, 2017
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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 person found this helpful
Helpful
Bell, CA – May 09, 2017
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Staff friendliness
What could be improved
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Appointment was rushed
  • Didn't trust the provider's decisions
10 people found this helpful
Helpful
Downey,CA – Mar 08, 2017
I remember the case well. I did go over what...Read More
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
1 person found this helpful
Helpful
Downey, CA – Feb 16, 2017
×Post a ResponseAre you Dr. William Sim, MD?
What went well
  • 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 person found this helpful
Helpful
Melanie VanLue in Las Vegas, NV – Feb 14, 2017
×Post a ResponseAre you Dr. William Sim, MD?
What went well
No results
What could be improved
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Appointment was rushed
11 people found this helpful
Helpful
CA – Jul 07, 2016
I try to address all the concerns a patient...Read More
×Post a ResponseAre you Dr. William Sim, MD?

Leave a review

How was your experience with Dr. Sim?

About Me

care philosophy

I am proud to be part of the Optum family of primary care doctors, specialists, and care teams focused on providing care for people ages 65+. At Optum, my team and I help you reach your personal health goals. We focus on your total well-being while...read more
  • 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.

  • Ronald Reagan Ucla Medical Center

    Internship Hospital, 1991
  • Stanford University School Of Medicine

    Medical School, 1990
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 one to three years
  • English

  • Korean

Insurance Check

Search for your insurance carrier and choose your plan type

Locations

Practice

Frischer Medical Group Inc.11480 Brookshire Ave Ste 200 Downey, CA 90241
1