Dr. John Jung Uk Sim, MD
- Medicare patients, 2024
- 13
- Part D claims, 2024
- 1,544
- Publications
- 9
- Hospital affiliations
- 1
- Industry payments
- $19,176
- Practice address
- 4700 Sunset Blvd, 2nd Floor, Los Angeles, CA 90027
- Practice phone
- Call (213) 667-8101
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Dialysis Unit at Los Angeles Medical Center
Dialysis Center - Independent · Los Angeles, California
Find Dr. Sim's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Jung Uk Sim is a nephrologist in Los Angeles, California
Dr. Sim practices at Dialysis Unit at Los Angeles Medical Center in Los Angeles, California.
Dr. Sim's NPI, 1255490868, was assigned on December 8, 2006. Dr. Sim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999. Dr. Sim holds California license A73136.
- NPI
- 1255490868NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133153646
- NPI enumeration date
- December 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (213) 667-8101
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Jung Uk Sim practices at Dialysis Unit at Los Angeles Medical Center in Los Angeles, California
Dr. Sim's primary practice is Dialysis Unit at Los Angeles Medical Center, at 4700 Sunset Blvd, 2nd Floor, Los Angeles, CA 90027 in Los Angeles County. The practice phone is (213) 667-8101.
- Dialysis Unit at Los Angeles Medical Center4700 Sunset Blvd, 2nd Floor, Los Angeles, CA 90027 · Los Angeles CountyPhone(213) 667-8101
Source: Dmand AI Affiliation Data
Dr. John Jung Uk Sim is affiliated with 3 sites of care and 1 medical group
Dr. Sim's primary practice is Dialysis Unit at Los Angeles Medical Center in Los Angeles, California. Dr. Sim is also affiliated with Kaiser Permanente Los Angeles Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Sim to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Jung Uk Sim's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sim practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dialysis Unit at Los Angeles Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Jung Uk Sim is one of 1,401 nephrologists in California
Nephrology is Dr. Sim's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Sim is board certified in nephrology by the American Board of Internal Medicine. Dr. Sim is licensed in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Clinical focus
Dmand AI lists chronic hypertension and underactive thyroid among the conditions Dr. Sim treats.
Nephrologists near Dr. Sim
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John Jung Uk Sim treated 13 Medicare patients in 2024, average age 58
CMS counts 13 Medicare patients who saw Dr. Sim in 2024. The largest group is 75 to 84, with 0 patients. 75% of them have chronic kidney disease, and 75% have diabetes. Their average risk score is 7.78, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Sim's median patient age at 71, with 40% women.
Dr. Sim's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Sim's Medicare patients, 2024
- Chronic kidney disease75%
- Diabetes75%
- High blood pressure75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sim's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women40%
- Men60%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Jung Uk Sim wrote 1,544 Medicare Part D claims in 2024
In 2024, Dr. Sim wrote 1,544 Medicare Part D claims for 192 patients. 78% of them were for generic drugs. CMS names the drug for 1,162 of them, across 34 drugs with 11 or more claims each, at $201,802 in total drug cost. In 2023, CMS named 1,226 claims across 34 drugs.
Dr. Sim's Part D claims by kind of drug, 2024
- Generic1,199 claims78%
- Brand-name322 claims21%
- Other23 claims1%
Dr. Sim's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Sim's Part D claims, 2024
- Opioids1%20 of 1,544 claims
- Antibiotics2%30 of 1,544 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,2262024: 1,1625%
Drugs named by CMS: 34 in 2024, 34 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John Jung Uk Sim takes part in Medicare
Dr. Sim accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John Jung Uk Sim has 9 publications on record
Dmand AI links 9 papers to Dr. Sim, published from 2011 to 2025. Dr. Sim's most frequent co-authors are John Sim, MD, Kamyar Zadeh Kalantar-Zadeh, MD and Csaba Pal Kovesdy, MD.
Dr. Sim's papers by year, 2011 to 2025
Dr. Sim's most frequent co-authors
- John Sim, MD7 shared papers
- Kamyar Zadeh Kalantar-Zadeh, MD5 shared papers
- Csaba Pal Kovesdy, MD4 shared papers
Recent publications by Dr. Sim
See who Dr. Sim researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Sim works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John Jung Uk Sim received $19,176 in industry payments from 2016 to 2022
CMS Open Payments shows 11 general payments to Dr. Sim from 7 drug and device companies from 2016 to 2022. Consulting fees make up the largest share, 99% of the total. Mallinckrodt LLC paid the most, $19,000. It also lists 2 research payments totaling $51,759 from 2016 to 2025.
General payments to Dr. Sim by program year, 2016 to 2022
General payments to Dr. Sim by kind, 2016 to 2022
- Consulting fees$19,00099%
- Food and beverage$1761%
Companies that paid Dr. Sim the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Jung Uk Sim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science
Dr. Sim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999.
- Medical school
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. John Jung Uk Sim accepts plans from 2 insurance carriers
Dr. Sim is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Sim accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Jung Uk Sim's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John Jung Uk Sim
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John Jung Uk Sim's NPI number?
Dr. John Jung Uk Sim's NPI number is 1255490868. It was assigned on December 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Jung Uk Sim?
Dr. John Jung Uk Sim is a nephrologist in Los Angeles, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. John Jung Uk Sim practice?
Dr. Sim practices at 4700 Sunset Blvd, 2nd Floor, Los Angeles, CA 90027. Dr. Sim's primary practice is Dialysis Unit at Los Angeles Medical Center in Los Angeles, California. Dmand AI also links Dr. Sim to 1 group practice or clinic.
What is Dr. John Jung Uk Sim's office phone number?
The practice phone on file for Dr. Sim is (213) 667-8101.
What is Dr. John Jung Uk Sim's medical license number?
Dr. Sim holds California license A73136.
Which hospitals is Dr. John Jung Uk Sim affiliated with?
Dr. Sim is affiliated with Kaiser Permanente Los Angeles Medical Center.
What medical group is Dr. John Jung Uk Sim part of?
Dr. Sim is linked to Southern California Permanente Medical Group.
Does Dr. John Jung Uk Sim accept Medicare?
Yes. CMS lists Dr. Sim as accepting Medicare assignment.
How many Medicare patients does Dr. John Jung Uk Sim see?
CMS counts 13 Medicare patients who saw Dr. Sim in 2024, with an average age of 58.
Is Dr. John Jung Uk Sim board certified?
Yes. Dr. Sim is board certified in nephrology by the American Board of Internal Medicine.
Show 7 more questionsShow fewer questions
Where did Dr. John Jung Uk Sim go to medical school?
Dr. Sim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999.
What drugs does Dr. John Jung Uk Sim prescribe most?
In 2024 Medicare Part D data, Dr. Sim's most prescribed drugs by claims were Jardiance, Losartan Potassium and Furosemide.
Has Dr. John Jung Uk Sim received payments from drug or device companies?
CMS Open Payments shows $19,176 in general payments to Dr. Sim from 7 companies from 2016 to 2022. The largest total came from Mallinckrodt LLC.
How long has Dr. John Jung Uk Sim been practicing?
Dr. Sim graduated from medical school in 1999, 27 years ago.
Does Dr. John Jung Uk Sim do research?
Dmand AI links 9 publications to Dr. Sim, published from 2011 to 2025.
Who does Dr. John Jung Uk Sim publish with?
Dr. Sim's most frequent co-authors are John Sim, MD (7 shared papers), Kamyar Zadeh Kalantar-Zadeh, MD (5 shared papers) and Csaba Pal Kovesdy, MD (4 shared papers).
What insurance does Dr. John Jung Uk Sim accept?
Dr. Sim is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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