Physician Profile
Unclaimed ProfileAbout SIM
William Chunghun Sim, MD is a healthcare provider in Downey, CA specialising in internal medicine. William trained at Stanford University School of Medicine, graduating in 1990.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Sim specialise in?
Dr. Sim is an internal medicine in Downey, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “INTERNAL MEDICINE”.
NPI registry
Where is Dr. Sim located?
Dr. Sim is listed at 11480 BROOKSHIRE AVE 200, Downey, CA 90241. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Sim's phone number?
The number on file is (562) 806-0874. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Sim's NPI number?
Dr. Sim's National Provider Identifier is 1437256906. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Sim go to medical school?
Dr. Sim attended Stanford University School of Medicine, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Sim been practising?
Dr. Sim has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Sim do most often?
According to Medicare billing data, Dr. Sim performs procedures including aspiration and/or injection of fluid from large joint; provides treatments such as injection of drug or substance under skin or into muscle and routine electrocardiogram using at least 12 leads with interpretation and report, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Sim confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Sim. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (562) 806-0874
- Email not available
Practice Locations
11480 BROOKSHIRE AVE 200
Downey, CA 90241
Procedures Most Often Billed to Medicare
5,538 services · 1,850 patients · 17 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
53 |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
109 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
51 |
| Injection, methylprednisolone acetate, 1 mg | Drug given | J1010 |
510 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Drug given | J3301 |
379 |
| Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes | Office visit | 99349 |
1,647 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
677 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
640 |
| Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99348 |
564 |
| Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allo | Billing code | G0181 |
423 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internal medicines at this location 3
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 31 related providers in 4 groups
Other internal medicines in Downey 7
Same specialty, same city.
Trained at Stanford University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1990 at Stanford University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid from large joint 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.