Doctor profile · Federal record
Dr. William Sim, MD
Internal Medicine Physician (CMS: Internal Medicine) · Downey, CA
- NPI 1437256906
- Accepts Medicare
- MIPS 75.0 / 100 · 2023
- 36 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
11480 Brookshire Ave, 200
Downey, CA 902419998
(562) 806-0874
fax (562) 927-4801
Credentials & registration
- NPI registered
- September 2006 — 20 yrs on file
- Profile last updated
- December 20, 2011
- Year of graduation
- 1990 — 36 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #G72353
- Medicaid
- CA #00G723520
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1437256906. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
4,892
Distinct HCPCS
10
Medicare allowed
$504,135
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99349 |
Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes | 1,541 | 279 | $137 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 791 | 251 | $100 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 598 | 309 | $141 | |
99348 |
Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes | 449 | 189 | $82 | |
99490 |
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 325 | 44 | $69 | |
J3301 |
Injection, triamcinolone acetonide, not otherwise specified, 10 mg | 291 | 48 | $1 | |
96372 |
Injection of drug or substance under skin or into muscle | 159 | 64 | $16 | |
G0181 |
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 allow | 115 | 76 | $114 | |
99345 |
Residence visit for new patient with high level of medical decision making, per day, if using time, at least 75 minutes | 108 | 108 | $218 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 73 | 61 | $63 |
In context: peer comparison
Among 15 peers in Downey Internal Medicine Physician, average services per provider: 213. This provider delivers 23× the peer median.Open Payments
Industry payments received
All-time total
$1,889
Transactions
76
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Lilly USA, LLC | 15 | $265.92 | |
| Abbvie INC. | 10 | $224.27 | |
| GlaxoSmithKline, LLC. | 7 | $159.08 | |
| Otsuka America Pharmaceutical, INC. | 7 | $144.02 | |
| AstraZeneca Pharmaceuticals Lp | 6 | $117.36 | |
| Pfizer INC. | 5 | $114.89 | |
| Phathom Pharmaceuticals, INC. | 4 | $100.66 | |
| Ardelyx, INC. | 4 | $98.80 | |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | 4 | $91.14 | |
| Novo Nordisk INC | 4 | $87.43 | |
| Novartis Pharmaceuticals Corporation | 3 | $61.90 | |
| Amgen INC. | 2 | $50.68 | |
| Ironwood Pharmaceuticals, INC | 2 | $43.35 | |
| Boston Scientific Corporation | 1 | $40.28 | |
| Radius Health, INC. | 2 | $40.02 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
12,322
Patients
2,430
Total drug cost
$543,351
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 1,590 | 326 | $23,852 |
| Losartan Potassium | Generic | 1,335 | 269 | $18,157 |
| Levothyroxine Sodium | Generic | 1,129 | 236 | $20,468 |
| Amlodipine Besylate | Generic | 1,010 | 197 | $8,619 |
| Metformin Hcl | Generic | 991 | 199 | $10,622 |
| Metoprolol Succinate | Generic | 956 | 180 | $21,202 |
| Omeprazole | Generic | 722 | 165 | $10,695 |
| Pantoprazole Sodium | Generic | 678 | 137 | $10,913 |
| Doxazosin Mesylate | Generic | 612 | 116 | $16,714 |
| Gabapentin | Generic | 602 | 99 | $10,528 |
Hospital affiliations
Frequently asked questions
What is Dr. William Sim's medical specialty?
Dr. William Sim practices Internal Medicine Physician in Downey, CA.
Where does Dr. William Sim practice?
Dr. William Sim practices at 11480 Brookshire Ave, Downey, CA 902419998. Office phone: 5628060874.
What is Dr. William Sim's NPI?
Dr. William Sim's National Provider Identifier (NPI) is 1437256906, issued by NPPES.
Does Dr. William Sim accept Medicare assignment?
Yes. Dr. William Sim accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Sim commonly perform?
Top Medicare-reported procedures in 2023: Residence visit for established patient with moderate level of medical decision making (HCPCS 99349); Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.