Doctor profile · Federal record
Dr. Son Nguyen, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Fairfield, CA
- NPI 1114119526
- Accepts Medicare
- MIPS 78.5 / 100 · 2023
- 22 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1525 Webster St, A
Fairfield, CA 945334997
(707) 423-9484 - Mailing address
-
5184 Palace CT
Fairfield, CA 945344161
Credentials & registration
- NPI registered
- August 2007 — 19 yrs on file
- Profile last updated
- October 18, 2008
- Year of graduation
- 2004 — 22 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A100779
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1114119526. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,303
Distinct HCPCS
9
Medicare allowed
$152,910
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 460 | 203 | $133 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 344 | 180 | $88 | |
99239 |
Hospital discharge day management, more than 30 minutes | 222 | 212 | $129 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 94 | 49 | $55 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 60 | 58 | $194 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 59 | 59 | $145 | |
99221 |
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 31 | 31 | $92 | |
99238 |
Hospital discharge day management, 30 minutes or less | 21 | 21 | $92 | |
99291 |
Critical care, first 30-74 minutes | 12 | 12 | $233 |
In context: peer comparison
Among 13 peers in Fairfield Internal Medicine Physician, average services per provider: 272. This provider delivers 4.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
124
Patients
78
Total drug cost
$13,249
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Furosemide | Generic | 21 | 18 | $118 |
| Eliquis (Apixaban) | Brand | 16 | 13 | $11,436 |
| Losartan Potassium | Generic | 15 | 12 | $102 |
| Atorvastatin Calcium | Generic | 14 | 12 | $103 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 12 | 12 | $103 |
| Hydralazine Hcl | Generic | 12 | 0 | $220 |
| Lisinopril | Generic | 12 | 0 | $104 |
| Metoprolol Succinate | Generic | 11 | 0 | $171 |
| Naloxone Hcl | Generic | 11 | 11 | $892 |
Hospital affiliations
Frequently asked questions
What is Dr. Son Nguyen's medical specialty?
Dr. Son Nguyen practices Internal Medicine Physician in Fairfield, CA.
Where does Dr. Son Nguyen practice?
Dr. Son Nguyen practices at 1525 Webster St, Fairfield, CA 945334997. Office phone: 7074239484.
What is Dr. Son Nguyen's NPI?
Dr. Son Nguyen's National Provider Identifier (NPI) is 1114119526, issued by NPPES.
Does Dr. Son Nguyen accept Medicare assignment?
Yes. Dr. Son Nguyen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Son Nguyen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.