Doctor profile · Federal record
Dr. Stephen Yoon, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Fullerton, CA
- NPI 1851327100
- Accepts Medicare
- 28 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
101 E Valencia Mesa Dr
Fullerton, CA 928353809
(714) 992-3000
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- May 13, 2015
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A71645
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1851327100. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
810
Distinct HCPCS
6
Medicare allowed
$86,529
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 303 | 166 | $83 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 294 | 135 | $125 | |
99238 |
Hospital discharge day management, 30 minutes or less | 85 | 85 | $86 | |
99239 |
Hospital discharge day management, more than 30 minutes | 64 | 63 | $121 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 46 | 46 | $137 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 18 | 18 | $182 |
In context: peer comparison
Among 14 peers in this city , average services per provider: 146. This provider delivers 5.5× the peer median.Open Payments
Industry payments received
All-time total
$145
Transactions
6
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| PFIZER INC. | 4 | $89.04 | |
| ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) | 1 | $36.18 | |
| Janssen Pharmaceuticals, Inc | 1 | $19.37 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
261
Patients
203
Total drug cost
$23,059
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 67 | 66 | $487 |
| Eliquis (Apixaban) | Brand | 33 | 20 | $21,616 |
| Pantoprazole Sodium | Generic | 30 | 21 | $173 |
| Furosemide | Generic | 22 | 18 | $63 |
| Atorvastatin Calcium | Generic | 20 | 13 | $204 |
| Prednisone | Generic | 19 | 17 | $159 |
| Metoprolol Tartrate | Generic | 18 | 13 | $64 |
| Carvedilol | Generic | 15 | 12 | $83 |
| Clopidogrel (Clopidogrel Bisulfate) | Brand | 14 | 0 | $68 |
| Ciprofloxacin Hcl | Generic | 12 | 12 | $91 |
Frequently asked questions
What is Dr. Stephen Yoon's medical specialty?
Dr. Stephen Yoon practices Internal Medicine Physician in Fullerton, CA.
Where does Dr. Stephen Yoon practice?
Dr. Stephen Yoon practices at 101 E Valencia Mesa Dr, Fullerton, CA 928353809. Office phone: 7149923000.
What is Dr. Stephen Yoon's NPI?
Dr. Stephen Yoon's National Provider Identifier (NPI) is 1851327100, issued by NPPES.
Does Dr. Stephen Yoon accept Medicare assignment?
Yes. Dr. Stephen Yoon accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Stephen Yoon commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Hospital discharge day management (HCPCS 99238). Source: CMS Medicare Physician & Other Practitioners file.