Doctor profile · Federal record
Dr. Gregory Nguyenduc, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Chandler, AZ
- NPI 1326016239
- Accepts Medicare
- 28 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
600 S Dobson RD Bldg A
Chandler, AZ 852245678
(480) 786-6655 - Mailing address
-
Po Box 6190
Chandler, AZ 852466190
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- February 10, 2010
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Arizona #35213
- Medicaid
- AZ #463520
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1326016239. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
650
Distinct HCPCS
10
Medicare allowed
$84,245
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 161 | 124 | $81 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 106 | 89 | $119 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 88 | 87 | $241 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 71 | 71 | $105 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 65 | 65 | $158 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 59 | 59 | $95 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 39 | 39 | $158 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 31 | 31 | $172 | |
43450 |
Dilation of esophagus | 19 | 19 | $38 | |
43251 |
Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare | 11 | 11 | $170 |
In context: peer comparison
Among 9 peers in this city , average services per provider: 61. This provider delivers 11× the peer median.Open Payments
Industry payments received
All-time total
$2,705
Transactions
112
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ABBVIE INC. | 29 | $612.68 | |
| PFIZER INC. | 16 | $368.68 | |
| Gilead Sciences, Inc. | 13 | $349.43 | |
| Phathom Pharmaceuticals, Inc. | 9 | $293.43 | |
| Ipsen Biopharmaceuticals, Inc | 4 | $202.70 | |
| Janssen Biotech, Inc. | 9 | $148.61 | |
| Celgene Corporation | 9 | $131.17 | |
| Lilly USA, LLC | 6 | $122.88 | |
| Celltrion USA Inc. | 4 | $93.45 | |
| Regeneron Healthcare Solutions, Inc. | 3 | $71.71 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 3 | $61.21 | |
| Ardelyx, Inc. | 2 | $49.31 | |
| Organon Llc | 2 | $38.66 | |
| Intra-Sana Laboratories | 2 | $33.41 | |
| Daiichi Sankyo Inc. | 1 | $29.68 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
568
Patients
186
Total drug cost
$206,976
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 306 | 125 | $5,004 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 34 | 33 | $557 |
| Mesalamine | Generic | 23 | 0 | $16,913 |
| Sucralfate | Generic | 21 | 11 | $4,921 |
| Colestipol Hcl | Generic | 20 | 0 | $2,039 |
| Famotidine | Generic | 19 | 0 | $155 |
| Humira(Cf) Pen (Adalimumab) | Brand | 19 | 0 | $141,640 |
| Dicyclomine Hcl | Generic | 18 | 0 | $198 |
| Linzess (Linaclotide) | Brand | 18 | 0 | $17,312 |
| Omeprazole | Generic | 17 | 0 | $104 |
Frequently asked questions
What is Dr. Gregory Nguyenduc's medical specialty?
Dr. Gregory Nguyenduc practices Gastroenterology Physician in Chandler, AZ.
Where does Dr. Gregory Nguyenduc practice?
Dr. Gregory Nguyenduc practices at 600 S Dobson RD Bldg A, Chandler, AZ 852245678. Office phone: 4807866655.
What is Dr. Gregory Nguyenduc's NPI?
Dr. Gregory Nguyenduc's National Provider Identifier (NPI) is 1326016239, issued by NPPES.
Does Dr. Gregory Nguyenduc accept Medicare assignment?
Yes. Dr. Gregory Nguyenduc accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Nguyenduc commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Established patient office or other outpatient visit (HCPCS 99214); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385). Source: CMS Medicare Physician & Other Practitioners file.