Internal Medicine, Gastroenterology · Rancho Cucamonga, CA
NPI
1356528566
Since 2008
Specialty
Internal Medicine, Gastroenterology
Code 207RG0100X
Group practices
1
Medicare group memberships
Hospitals
1
Hospital affiliations
10801 Foothill Blvd Ste 106
Rancho Cucamonga, CA, 91730
Phone (909) 255-7200
Groups this clinician bills Medicare through
Medicare paid, 2024
$16K
164 services
Medicare patients, 2024
98
Average age 71
Drug cost, 2024
$261K
902 prescriptions
Company payments, 2025
$134
From 4 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Andrea S Tieng was code 45385 (colonoscopy - lesion removal), 33 times for 31 patients. In total Andrea S Tieng billed 164 services in 10 codes, and Medicare paid $16K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2022-01-27.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 45385 Colonoscopy - Lesion Removal | Facility | 33 | 31 | $195.41 | $6,449 |
| G0500 Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | Facility | 32 | 32 | $4.48 | $143 |
| 99203 Office E&M - New | Office | 22 | 22 | $80.25 | $1,765 |
| 43239 Upper GI Endoscopy | Facility | 22 | 22 | $82.59 | $1,817 |
| G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | Facility | 17 | 17 | $172.27 | $2,929 |
| 99213 Office E&M - Established | Office | 16 | 14 | $64.25 | $1,028 |
| 45380 Lower GI Endoscopy - Other | Facility | 11 | 11 | $92.61 | $1,019 |
By year: 2022 $18K for 197 services; 2023 $17K for 184 services; 2024 $16K for 164 services.
Medicare prescription drug claims, 2024
In 2024, the drug Andrea S Tieng prescribed most often to Medicare patients was Gavilyte-C (Peg3350/Sod Sulf,bicarb,cl/Kcl), with 362 prescriptions and refills. In total Andrea S Tieng wrote 902 Medicare prescriptions that cost $261K.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Gavilyte-C Peg3350/Sod Sulf,bicarb,cl/Kcl | 362 | 362 | 340 | $10K |
| Gavilyte-G Peg3350/Sod Sulf,bicarb,cl/Kcl | 140 | 140 | 127 | $2,146 |
| Pantoprazole Sodium Generic | 108 | 220 | 61 | $1,311 |
| Peg-3350 And Electrolytes Peg3350/Sod Sulf,bicarb,cl/Kcl | 81 | 81 | 74 | $1,316 |
| Viberzi Eluxadoline | 36 | 40 | Under 11 | $62K |
| Dexlansoprazole Dr Dexlansoprazole | 24 | 42 | Under 11 | $7,653 |
| Mesalamine Generic | 15 | 29 | Under 11 | $13K |
| Entyvio Vedolizumab | 12 | 20 | Under 11 | $102K |
| Linzess Linaclotide | 12 | 22 | Under 11 | $12K |
Brand drugs: 181 claims; generic drugs: 721 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Andrea S Tieng $134 ($134 in general payments such as food, travel and fees) from 4 companies. The largest payer was Janssen Biotech, Inc. with $49.06.
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.