Doctor profile · Federal record
Dr. Timothy Byun, MD
Hematology & Oncology Physician (CMS: Hematology/Oncology) · Orange, CA
- NPI 1871545012
- Accepts Medicare
- 28 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
805 W la Veta Ave Ste 101
Orange, CA 928683928
(714) 835-1800 - Additional location
-
1010 W la Veta Ave, #200
Orange, CA 928684300
fax (714) 835-1811
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- June 4, 2024
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RH0003X — NUCC code
- State license (1)
- California #A70195
- Medicaid
- CA #00A701950734
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1871545012. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,593
Distinct HCPCS
10
Medicare allowed
$137,514
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 546 | 280 | $139 | |
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 261 | 91 | $8 | |
36415 |
Insertion of needle into vein for collection of blood sample | 257 | 96 | $8 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 101 | 23 | $125 | |
80053 |
Blood test, comprehensive group of blood chemicals | 74 | 34 | $10 | |
96413 |
Administration of chemotherapy into vein, 1 hour or less | 69 | 23 | $152 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 65 | 65 | $237 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 51 | 40 | $98 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 51 | 46 | $92 | |
96372 |
Injection of drug or substance under skin or into muscle | 39 | 16 | $16 |
In context: peer comparison
Among 20 peers in this city , average services per provider: 1,067. This provider delivers 1.5× the peer median.Open Payments
Industry payments received
All-time total
$6,726
Transactions
174
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| AstraZeneca Pharmaceuticals LP | 17 | $2,072.05 | |
| PFIZER INC. | 28 | $536.60 | |
| Novartis Pharmaceuticals Corporation | 21 | $486.19 | |
| Merck Sharp & Dohme LLC | 10 | $231.31 | |
| Exelixis Inc. | 7 | $212.25 | |
| GlaxoSmithKline, LLC. | 13 | $203.33 | |
| E.R. Squibb & Sons, L.L.C. | 18 | $198.46 | |
| ABBVIE INC. | 14 | $190.75 | |
| Sumitomo Pharma America, Inc. | 8 | $162.04 | |
| Janssen Biotech, Inc. | 8 | $156.38 | |
| ARRAY BIOPHARMA INC | 8 | $152.58 | |
| Genentech USA, Inc. | 5 | $145.14 | |
| Daiichi Sankyo Inc. | 5 | $143.36 | |
| Astellas Pharma US Inc | 6 | $139.76 | |
| Gilead Sciences, Inc. | 6 | $136.69 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
755
Patients
173
Total drug cost
$2,001,977
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Anastrozole | Generic | 129 | 43 | $4,204 |
| Xtandi (Enzalutamide) | Brand | 86 | 12 | $1,242,713 |
| Acyclovir | Generic | 66 | 17 | $1,447 |
| Prednisone | Generic | 61 | 15 | $313 |
| Levothyroxine Sodium | Generic | 59 | 15 | $1,102 |
| Eliquis (Apixaban) | Brand | 55 | 18 | $66,764 |
| Dexamethasone | Generic | 40 | 15 | $409 |
| Imatinib Mesylate | Generic | 38 | 0 | $108,576 |
| Letrozole | Generic | 37 | 0 | $1,673 |
| Orgovyx (Relugolix) | Brand | 34 | 0 | $89,898 |
Hospital affiliations
Frequently asked questions
What is Dr. Timothy Byun's medical specialty?
Dr. Timothy Byun practices Hematology & Oncology Physician in Orange, CA.
Where does Dr. Timothy Byun practice?
Dr. Timothy Byun practices at 805 W la Veta Ave Ste 101, Orange, CA 928683928. Office phone: 7148351800.
What is Dr. Timothy Byun's NPI?
Dr. Timothy Byun's National Provider Identifier (NPI) is 1871545012, issued by NPPES.
Does Dr. Timothy Byun accept Medicare assignment?
Yes. Dr. Timothy Byun accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Timothy Byun commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (HCPCS 85025); Insertion of needle into vein for collection of blood sample (HCPCS 36415). Source: CMS Medicare Physician & Other Practitioners file.