Doctor profile · Federal record
Dr. Hai Nguyen, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Hospitalist Physician · General Practice Physician · Santa Ana, CA
- NPI 1558516963
- Accepts Medicare
- 29 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2907 Sawgrass Dr
Santa Ana, CA 927061195
(714) 675-3937
fax (877) 820-4151
Credentials & registration
- NPI registered
- November 2008 — 18 yrs on file
- Profile last updated
- December 19, 2013
- Year of graduation
- 1997 — 29 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A114137
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1558516963. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,278
Distinct HCPCS
5
Medicare allowed
$332,461
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 2,008 | 140 | $81 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 803 | 146 | $121 | |
99239 |
Hospital discharge day management, more than 30 minutes | 198 | 132 | $117 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 194 | 125 | $176 | |
99291 |
Critical care, first 30-74 minutes | 75 | 33 | $216 |
In context: peer comparison
Among 13 peers in this city , average services per provider: 193. This provider delivers 17× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
534
Patients
507
Total drug cost
$20,195
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 59 | 53 | $326 |
| Cephalexin | Generic | 50 | 48 | $368 |
| Atorvastatin Calcium | Generic | 39 | 39 | $258 |
| Furosemide | Generic | 39 | 35 | $159 |
| Nitroglycerin | Generic | 39 | 39 | $450 |
| Levofloxacin | Generic | 38 | 36 | $143 |
| Metoprolol Tartrate | Generic | 38 | 37 | $157 |
| Cefdinir | Generic | 34 | 33 | $487 |
| Ondansetron Hcl | Generic | 34 | 33 | $364 |
| Clopidogrel (Clopidogrel Bisulfate) | Brand | 33 | 30 | $247 |
Hospital affiliations
Frequently asked questions
What is Dr. Hai Nguyen's medical specialty?
Dr. Hai Nguyen practices Internal Medicine Physician in Santa Ana, CA.
Where does Dr. Hai Nguyen practice?
Dr. Hai Nguyen practices at 2907 Sawgrass Dr, Santa Ana, CA 927061195. Office phone: 7146753937.
What is Dr. Hai Nguyen's NPI?
Dr. Hai Nguyen's National Provider Identifier (NPI) is 1558516963, issued by NPPES.
Does Dr. Hai Nguyen accept Medicare assignment?
Yes. Dr. Hai Nguyen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Hai Nguyen 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 99239). Source: CMS Medicare Physician & Other Practitioners file.