John Sim, MD
NPI 1255490868 · Nephrology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Sim, MD is a Nephrology Physician provider in Los Angeles, CA (NPI 1255490868).
Provider details
- NPI number
- 1255490868
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A73136 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Empagliflozinbrand: Jardiance | 166 | 51 |
| Losartan Potassium | 99 | 45 |
| Furosemide | 78 | 35 |
| Spironolactone | 77 | 29 |
| Carvedilol | 65 | 24 |
| Glipizide | 59 | 23 |
| Amlodipine Besylate | 46 | 20 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2021-11-29
Frequently asked questions
- What is John Sim's NPI number?
- John Sim's National Provider Identifier (NPI) is 1255490868, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Sim's specialty?
- John Sim is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is John Sim located?
- John Sim's practice location on file with NPPES is 4733 W Sunset Blvd, Los Angeles, CA 90027-6021.
- What is John Sim's phone number?
- The practice phone number listed in the NPPES registry for John Sim is (323) 783-4011.
- Does John Sim accept Medicare?
- John Sim is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Sim's NPI active?
- Yes — John Sim's NPI (1255490868) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.