Doctor profile · Federal record
Dr. Ythanh Nguyen, MD
Internal Medicine Physician · Rancho Cucamonga, CA
- NPI 1255391181
- 20 yrs on file
- Female
- Solo practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
8235 Rochester Ave
Rancho Cucamonga, CA 917300718
(909) 484-4900
fax (909) 781-2949 - Additional location
-
999 San Bernardino RD, San Antonio Community Hospital
Upland, CA 917864920
(562) 236-3432
fax (909) 944-5904 - Mailing address
-
154 W Foothill Blvd Ste A
Upland, CA 917868702
Credentials & registration
- NPI registered
- March 2006 — 20 yrs on file
- Profile last updated
- December 14, 2025
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A84989
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1255391181. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
513
Distinct HCPCS
4
Medicare allowed
$67,958
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 269 | 74 | $121 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 92 | 36 | $132 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 92 | 76 | $176 | |
99239 |
Hospital discharge day management, more than 30 minutes | 60 | 52 | $117 |
In context: peer comparison
Among 9 peers in Rancho Cucamonga Internal Medicine Physician, average services per provider: 161. This provider delivers 3.2× the peer median.Open Payments
Industry payments received
All-time total
$121
Transactions
5
Manufacturers
3
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Pfizer INC. | 3 | $66.20 | |
| Janssen Pharmaceuticals, INC | 1 | $27.79 | |
| Insmed, INC. | 1 | $27.42 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
803
Patients
476
Total drug cost
$99,708
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Furosemide | Generic | 107 | 66 | $893 |
| Carvedilol | Generic | 83 | 43 | $997 |
| Eliquis (Apixaban) | Brand | 71 | 33 | $56,146 |
| Levofloxacin | Generic | 66 | 63 | $299 |
| Prednisone | Generic | 59 | 45 | $408 |
| Amlodipine Besylate | Generic | 58 | 40 | $488 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 56 | 40 | $666 |
| Atorvastatin Calcium | Generic | 49 | 22 | $1,173 |
| Pantoprazole Sodium | Generic | 43 | 29 | $647 |
| Losartan Potassium | Generic | 42 | 18 | $616 |
Frequently asked questions
What is Dr. Ythanh Nguyen's medical specialty?
Dr. Ythanh Nguyen practices Internal Medicine Physician in Rancho Cucamonga, CA.
Where does Dr. Ythanh Nguyen practice?
Dr. Ythanh Nguyen practices at 8235 Rochester Ave, Rancho Cucamonga, CA 917300718. Office phone: 9094844900.
What is Dr. Ythanh Nguyen's NPI?
Dr. Ythanh Nguyen's National Provider Identifier (NPI) is 1255391181, issued by NPPES.
What procedures does Dr. Ythanh Nguyen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Established patient office or other outpatient visit (HCPCS 99214); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.