Internal Medicine · Downey, CA
NPI
1437256906
Since 2006
Specialty
Internal Medicine
Code 207R00000X
Group practices
1
Medicare group memberships
Hospitals
3
Hospital affiliations
11480 Brookshire Ave, 200
Downey, CA, 90241
Phone (562) 806-0874
Groups this clinician bills Medicare through
Medicare paid, 2024
$376K
5,946 services
Medicare patients, 2024
787
Average age 80
Drug cost, 2024
$3.6M
38,470 prescriptions
Company payments, 2025
$1,982
From 26 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by William C Sim was code 99349 (home e&m - new and established), 1,647 times for 315 patients. In total William C Sim billed 5,946 services in 35 codes, and Medicare paid $376K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2011-12-20.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 99349 Home E&M - New and Established | Office | 1,647 | 315 | $95.02 | $156K |
| 99214 Office E&M - Established | Office | 677 | 331 | $90.63 | $61K |
| 99213 Office E&M - Established | Office | 640 | 238 | $69.81 | $45K |
| 99348 Home E&M - New and Established | Office | 564 | 235 | $55.40 | $31K |
| J1010 Injection, methylprednisolone acetate, 1 mg | Office | 510 | 11 | $0.10 | $53.48 |
| 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 | Office | 423 | 245 | $85.12 | $36K |
| J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Office | 379 | 62 | $0.64 | $243 |
| 99490 Chronic, Principal, and Transitional Care Management | Office | 215 | 30 | $50.61 | $11K |
| 99345 Home E&M - New and Established | Office | 125 | 125 | $146.63 | $18K |
| 96372 Injection Administration | Office | 109 | 58 | $11.05 | $1,205 |
| 20610 Joint Injection | Office | 53 | 36 | $52.31 | $2,773 |
| 93000 Electrocardiogram | Office | 51 | 46 | $9.59 | $489 |
| 81002 Clinical Chemistry | Office | 47 | 29 | $3.41 | $160 |
| 99215 Office E&M - Established | Office | 39 | 34 | $116.41 | $4,540 |
| 99212 Office E&M - Established | Office | 27 | 23 | $41.18 | $1,112 |
By year: 2022 $335K for 4,740 services; 2023 $356K for 4,949 services; 2024 $376K for 5,946 services.
Lab tests billed to Medicare, 2024
| Test code | Tests | Patients | Paid per test | Medicare paid |
|---|---|---|---|---|
| 81002 Clinical Chemistry | 47 | 29 | $3.41 | $160 |
Medicare prescription drug claims, 2024
In 2024, the drug William C Sim prescribed most often to Medicare patients was Atorvastatin Calcium, with 2,063 prescriptions and refills. In total William C Sim wrote 38,470 Medicare prescriptions that cost $3.6M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Atorvastatin Calcium Generic | 2,063 | 3,491 | 400 | $20K |
| Losartan Potassium Generic | 1,669 | 2,929 | 319 | $14K |
| Amlodipine Besylate Generic | 1,383 | 2,233 | 265 | $6,839 |
| Metformin Hcl Generic | 1,224 | 2,067 | 243 | $7,442 |
| Levothyroxine Sodium Generic | 1,215 | 2,536 | 245 | $15K |
| Metoprolol Succinate Generic | 1,005 | 1,846 | 200 | $14K |
| Pantoprazole Sodium Generic | 800 | 1,282 | 155 | $8,832 |
| Omeprazole Generic | 795 | 1,328 | 166 | $9,366 |
| Linzess Linaclotide | 768 | 839 | 132 | $440K |
| Donepezil Hcl Generic | 750 | 789 | 96 | $6,040 |
| Gabapentin Generic | 710 | 865 | 112 | $9,997 |
| Tamsulosin Hcl Generic | 683 | 1,024 | 131 | $13K |
| Potassium Chloride Generic | 674 | 885 | 132 | $18K |
| Memantine Hcl Generic | 650 | 719 | 92 | $30K |
| Montelukast Sodium Generic | 583 | 927 | 108 | $7,905 |
Brand drugs: 5,221 claims; generic drugs: 33,050 claims; opioid claims: 325.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid William C Sim $1,982 ($1,982 in general payments such as food, travel and fees) from 26 companies. The largest payer was Abbvie Inc. with $479.
| Company | Payments | Amount |
|---|---|---|
| Abbvie Inc. ABBV | 21 | $479 |
| AstraZeneca Pharmaceuticals LP AZN | 8 | $164 |
| Novo Nordisk Inc NVO | 9 | $161 |
| Lilly USA, LLC LLY | 7 | $158 |
| GlaxoSmithKline, LLC. GSK | 9 | $156 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | 5 | $120 |
| Pfizer Inc. PFE | 4 | $87.35 |
| Dexcom, Inc. DXCM | 3 | $69.36 |
| Otsuka America Pharmaceutical, Inc. 4578.T | 3 | $59.38 |
| Amgen Inc. AMGN | 2 | $56.46 |
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.