Doctor profile · Federal record
Dr. William Tsai, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Irvine, CA
- NPI 1952356560
- Accepts Medicare
- MIPS 16.1 / 100 · 2023
- 29 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
19742 Macarthur Blvd, Ste 101
Irvine, CA 926122432
(949) 955-0202
fax (949) 955-0203
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- July 16, 2010
- Year of graduation
- 1997 — 29 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A71679
- Medicaid
- CA #00A716790
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1952356560. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
2,509
Distinct HCPCS
10
Medicare allowed
$374,724
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 1,129 | 581 | $139 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 577 | 419 | $194 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 297 | 297 | $140 | |
G0180 |
Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and | 162 | 39 | $58 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 79 | 79 | $237 | |
99350 |
Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes | 73 | 14 | $197 | |
G0438 |
Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit | 61 | 61 | $178 | |
93000 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 49 | 46 | $16 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 37 | 29 | $98 | |
99349 |
Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes | 29 | 13 | $135 |
In context: peer comparison
Among 37 peers in Irvine Internal Medicine Physician, average services per provider: 103. This provider delivers 24× the peer median.Open Payments
Industry payments received
All-time total
$182
Transactions
4
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Amgen INC. | 1 | $120.39 | |
| AstraZeneca Pharmaceuticals Lp | 3 | $61.92 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
3,769
Patients
1,249
Total drug cost
$46,304
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 756 | 252 | $8,286 |
| Amlodipine Besylate | Generic | 415 | 130 | $3,714 |
| Levothyroxine Sodium | Generic | 393 | 117 | $5,548 |
| Losartan Potassium | Generic | 330 | 97 | $4,056 |
| Metformin Hcl | Generic | 294 | 95 | $2,221 |
| Zolpidem Tartrate | Generic | 273 | 74 | $2,552 |
| Rosuvastatin Calcium | Generic | 230 | 77 | $5,107 |
| Alprazolam | Generic | 154 | 50 | $1,391 |
| Tamsulosin Hcl | Generic | 153 | 50 | $4,060 |
| Simvastatin | Generic | 144 | 44 | $1,635 |
Hospital affiliations
Frequently asked questions
What is Dr. William Tsai's medical specialty?
Dr. William Tsai practices Internal Medicine Physician in Irvine, CA.
Where does Dr. William Tsai practice?
Dr. William Tsai practices at 19742 Macarthur Blvd, Irvine, CA 926122432. Office phone: 9499550202.
What is Dr. William Tsai's NPI?
Dr. William Tsai's National Provider Identifier (NPI) is 1952356560, issued by NPPES.
Does Dr. William Tsai accept Medicare assignment?
Yes. Dr. William Tsai accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Tsai commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99215); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439). Source: CMS Medicare Physician & Other Practitioners file.