John Jung Uk Sim, MD
Nephrology Physician · Los Angeles, CA
John Jung Uk Sim, MD is a nephrology physician with a practice address in Los Angeles, California, and NPI 1255490868, issued on Dec 8, 2006. Check the license (California A73136, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Jung Uk Sim
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A73136 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4733 W Sunset Blvd, Los Angeles, CA 90027
- Phone
- (323) 783-4011
- Enumerated
- Dec 8, 2006
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050923000725); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 4733 W Sunset Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Isaac Abusleme, M.D.Internal Medicine Physician1891109468
- Nancy Adachi, PTPhysical Therapist1902004245
- Sangeeta Aggarwal, MDInternal Medicine Physician1578655908
Verify John Jung Uk Sim in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A73136Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% more Medicare Part D claims than the average nephrology physician in 2024
1,544 Medicare Part D claims for 192 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 20 claims were for opioids.
Most prescribed
- Jardiance166 claims
- Losartan Potassium99 claims
- Furosemide78 claims
- Spironolactone77 claims
- Carvedilol65 claims
- Glipizide59 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Jung Uk Sim among 1,468 nephrology physician records in California
John Jung Uk Sim, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1999 · median 2001 among the 1,128 with a school on file
- Record last updated2021 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Los Angeles → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Antoine Abcar, MDLos Angeles, CA 900271245301159
- Peter Crooks, MDLos Angeles, CA 900271215085105
- Hong Dang, M.D.Los Angeles, CA 900271013351790
- Ryszard Dudek, MDLos Angeles, CA 900271154498178
- Joseph Kahwaji, MDLos Angeles, CA 900271740349489
- Dean Kujubu, MDLos Angeles, CA 900271306917349
- Victoria Kumar, MDLos Angeles, CA 900271568521128
- Mateo Ledezma, MDLos Angeles, CA 900271841361813
Common questions
What is John Jung Uk Sim, MD's NPI number?
John Jung Uk Sim, MD's National Provider Identifier (NPI) is 1255490868, issued on Dec 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Jung Uk Sim, MD located?
The NPPES record lists a practice address at 4733 W Sunset Blvd, Los Angeles, CA, 90027. Phone: (323) 783-4011. Providers update this record themselves, so call before visiting.
How can I verify John Jung Uk Sim, MD's license?
NPPES lists California license number A73136, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Jung Uk Sim, MD prescribe under Medicare Part D?
In 2024, John Jung Uk Sim, MD had 1,544 Medicare Part D claims for 192 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.