Doctor profile · Federal record
Dr. Sang Hoon Ahn, M.D.
Internal Medicine Physician (CMS: Hematology/Oncology) · Medical Oncology Physician · Fullerton, CA
- NPI 1568581759
- Accepts Medicare
- 32 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
1950 Sunny Crest Dr Ste 2800
Fullerton, CA 928353641
(657) 888-9919
fax (657) 888-9941 - Additional location
-
500 S Virgil Ave, Suite 502
Los Angeles, CA 900201446
(213) 388-0908
fax (213) 388-0919 - Additional location
-
5832 Beach Blvd Unit 201
Buena Park, CA 906215501
(714) 522-0908
fax (714) 522-0919 - Mailing address
-
1520 Hollydale Dr
Fullerton, CA 928311115
Credentials & registration
- NPI registered
- March 2007 — 19 yrs on file
- Profile last updated
- February 18, 2026
- Year of graduation
- 1994 — 32 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A95562
- Medicaid
- CA #00A955620
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1568581759. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,397
Distinct HCPCS
8
Medicare allowed
$132,632
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 659 | 337 | $104 | |
99441 |
Telephone medical discussion with physician, 5-10 minutes | 326 | 205 | $37 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 151 | 98 | $152 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 68 | 68 | $192 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 62 | 62 | $141 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 54 | 30 | $38 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 47 | 42 | $70 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 30 | 27 | $70 |
In context: peer comparison
Among 14 peers in this city , average services per provider: 146. This provider delivers 9.6× the peer median.Open Payments
Industry payments received
All-time total
$48
Transactions
3
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Merck Sharp & Dohme LLC | 1 | $18.09 | |
| Agios Pharmaceuticals, Inc. | 1 | $16.53 | |
| BeiGene USA, Inc. | 1 | $13.74 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
741
Patients
98
Total drug cost
$5,013,435
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Tagrisso (Osimertinib Mesylate) | Brand | 78 | 0 | $1,344,000 |
| Promacta (Eltrombopag Olamine) | Brand | 72 | 0 | $708,115 |
| Anastrozole | Generic | 70 | 23 | $3,142 |
| Procrit (Epoetin Alfa) | Brand | 65 | 26 | $95,442 |
| Letrozole | Generic | 61 | 21 | $2,474 |
| Abiraterone Acetate | Generic | 58 | 0 | $88,935 |
| Hydroxyurea | Generic | 51 | 17 | $1,334 |
| Tasigna (Nilotinib Hcl) | Brand | 46 | 0 | $789,015 |
| Prednisone | Generic | 42 | 0 | $291 |
| Levothyroxine Sodium | Generic | 39 | 11 | $639 |
Frequently asked questions
What is Dr. Sang Hoon Ahn's medical specialty?
Dr. Sang Hoon Ahn practices Internal Medicine Physician in Fullerton, CA.
Where does Dr. Sang Hoon Ahn practice?
Dr. Sang Hoon Ahn practices at 1950 Sunny Crest Dr Ste 2800, Fullerton, CA 928353641. Office phone: 6578889919.
What is Dr. Sang Hoon Ahn's NPI?
Dr. Sang Hoon Ahn's National Provider Identifier (NPI) is 1568581759, issued by NPPES.
Does Dr. Sang Hoon Ahn accept Medicare assignment?
Yes. Dr. Sang Hoon Ahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Sang Hoon Ahn commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Telephone medical discussion with physician (HCPCS 99441); Established patient office or other outpatient visit (HCPCS 99215). Source: CMS Medicare Physician & Other Practitioners file.