Doctor profile · Federal record
Dr. William Tsai, D.O.
Family Medicine Physician (CMS: Family Practice) · Upland, CA
- NPI 1285620443
- Accepts Medicare
- 30 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
510 N 13Th Ave Ste 101
Upland, CA 917864973
(909) 985-8838
fax (909) 985-8899
Credentials & registration
- NPI registered
- September 2005 — 21 yrs on file
- Profile last updated
- April 24, 2024
- Year of graduation
- 1996 — 30 yrs since
- Specialty taxonomy
- 207Q00000X — NUCC code
- State license (1)
- California #20A7115
- Medicaid
- CA #00AX71150
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1285620443. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
804
Distinct HCPCS
8
Medicare allowed
$65,834
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99497 |
Advance care planning, first 30 minutes | 223 | 24 | $77 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 171 | 71 | $91 | |
99308 |
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes | 165 | 22 | $77 | |
99348 |
Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes | 129 | 13 | $79 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 52 | 25 | $92 | |
G0179 |
Physician or allowed practitioner re-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 a | 26 | 12 | $43 | |
99306 |
Initial nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | 22 | 13 | $148 | |
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 | 16 | 12 | $54 |
In context: peer comparison
Among 8 peers in Upland Family Medicine Physician, average services per provider: 109. This provider delivers 7.4× the peer median.Open Payments
Industry payments received
All-time total
$1,291
Transactions
45
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Novartis Pharmaceuticals Corporation | 10 | $180.36 | |
| Inari Medical, INC. | 1 | $176.73 | |
| Lilly USA, LLC | 8 | $173.80 | |
| Teva Pharmaceuticals USA, INC. | 3 | $99.84 | |
| Novo Nordisk INC | 4 | $87.07 | |
| Pfizer INC. | 3 | $73.93 | |
| Otsuka America Pharmaceutical, INC. | 3 | $69.93 | |
| AstraZeneca Pharmaceuticals Lp | 3 | $60.24 | |
| Exact Sciences Corporation | 2 | $44.60 | |
| Boehringer Ingelheim Pharmaceuticals, INC. | 2 | $42.37 | |
| Sumitomo Pharma America, INC. | 2 | $39.23 | |
| Hologic Sales and Service, LLC | 1 | $27.26 | |
| Bayer Healthcare Pharmaceuticals INC. | 1 | $26.50 | |
| Insmed, INC. | 1 | $24.92 | |
| Shield Therapeutics INC | 1 | $24.68 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
4,465
Patients
1,018
Total drug cost
$67,911
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 970 | 228 | $15,629 |
| Amlodipine Besylate | Generic | 581 | 143 | $5,197 |
| Levothyroxine Sodium | Generic | 471 | 73 | $6,535 |
| Losartan Potassium | Generic | 365 | 93 | $5,383 |
| Metformin Hcl | Generic | 295 | 76 | $2,757 |
| Carvedilol | Generic | 231 | 46 | $2,255 |
| Tamsulosin Hcl | Generic | 226 | 58 | $3,630 |
| Trazodone Hcl | Generic | 200 | 40 | $2,180 |
| Furosemide | Generic | 172 | 35 | $1,065 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 170 | 40 | $3,933 |
Frequently asked questions
What is Dr. William Tsai's medical specialty?
Dr. William Tsai practices Family Medicine Physician in Upland, CA.
Where does Dr. William Tsai practice?
Dr. William Tsai practices at 510 N 13Th Ave Ste 101, Upland, CA 917864973. Office phone: 9099858838.
What is Dr. William Tsai's NPI?
Dr. William Tsai's National Provider Identifier (NPI) is 1285620443, 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: Advance care planning (HCPCS 99497); Established patient office or other outpatient visit (HCPCS 99213); Subsequent nursing facility care with straightforward level of medical decision making (HCPCS 99308). Source: CMS Medicare Physician & Other Practitioners file.