Doctor profile · Federal record
Dr. Duke Nguyen, MD
Gastroenterology Physician (CMS: Gastroenterology) · Fountain Valley, CA
- NPI 1679557797
- Accepts Medicare
- 30 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
9900 Talbert Ave, Ste 100
Fountain Valley, CA 927085153
(714) 378-7390
fax (714) 378-7290
Credentials & registration
- NPI registered
- December 2005 — 21 yrs on file
- Profile last updated
- March 19, 2010
- Year of graduation
- 1996 — 30 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #A72508
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1679557797. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
575
Distinct HCPCS
9
Medicare allowed
$76,368
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 129 | 110 | $98 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 83 | 83 | $146 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 77 | 77 | $180 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 64 | 24 | $83 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 63 | 53 | $139 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 59 | 59 | $112 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 36 | 36 | $122 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 34 | 34 | $253 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 30 | 30 | $137 |
In context: peer comparison
Among 3 peers in this city , average services per provider: 45. This provider delivers 13× the peer median.Open Payments
Industry payments received
All-time total
$20,231
Transactions
32
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Gilead Sciences, Inc. | 10 | $9,796.62 | |
| Phathom Pharmaceuticals, Inc. | 16 | $9,703.02 | |
| Medtronic, Inc. | 4 | $574.22 | |
| Madrigal Pharmaceuticals | 1 | $144.17 | |
| ABBVIE INC. | 1 | $13.35 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
599
Patients
330
Total drug cost
$143,514
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 93 | 54 | $1,718 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 89 | 88 | $6,858 |
| Vemlidy (Tenofovir Alafenamide) | Brand | 74 | 0 | $117,557 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 65 | 62 | $1,089 |
| Dicyclomine Hcl | Generic | 61 | 25 | $1,947 |
| Peg3350-Sod Sul-Nacl-Kcl-Asb-C (Peg3350/Sod Sul/Nacl/Kcl/Asb/C) | Brand | 47 | 45 | $3,868 |
| Famotidine | Generic | 46 | 24 | $997 |
| Pantoprazole Sodium | Generic | 34 | 20 | $675 |
| Lansoprazole | Generic | 19 | 0 | $589 |
| Mesalamine | Generic | 13 | 0 | $5,514 |
Hospital affiliations
Frequently asked questions
What is Dr. Duke Nguyen's medical specialty?
Dr. Duke Nguyen practices Gastroenterology Physician in Fountain Valley, CA.
Where does Dr. Duke Nguyen practice?
Dr. Duke Nguyen practices at 9900 Talbert Ave, Fountain Valley, CA 927085153. Office phone: 7143787390.
What is Dr. Duke Nguyen's NPI?
Dr. Duke Nguyen's National Provider Identifier (NPI) is 1679557797, issued by NPPES.
Does Dr. Duke Nguyen accept Medicare assignment?
Yes. Dr. Duke Nguyen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Duke Nguyen commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Biopsy of large bowel using a flexible endoscope (HCPCS 45380); New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.