Andrea S. Tieng, M.D.
Gastroenterology Physician · Rancho Cucamonga, CA
Andrea S. Tieng, M.D. is a gastroenterology physician with a practice address in Rancho Cucamonga, California, and NPI 1356528566, issued on Jan 30, 2008. Check the license (California A106477, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrea S. Tieng
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- A106477 CA
241597 NY
Self-reported in NPPES; status is on the state search - Practice location
- 10801 Foothill Blvd Ste 106, Rancho Cucamonga, CA 91730
- Phone
- (909) 255-7200
- Enumerated
- Jan 30, 2008
- Record last updated
- Jan 27, 2022
- Fax
- (909) 255-7215
- Medicare enrollment
- Enrolled (PECOS I20100428000624); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Andrea S. Tieng in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A106477Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% more Medicare Part D claims than the average gastroenterology physician in 2024
902 Medicare Part D claims for 619 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Gavilyte-C362 claims
- Gavilyte-G140 claims
- Pantoprazole Sodium108 claims
- Peg-3350 And Electrolytes81 claims
- Viberzi36 claims
- Dexlansoprazole Dr24 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $252.33
12 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Andrea S. Tieng among 2,140 gastroenterology physician records in California
Andrea S. Tieng, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 63% of them.
- NPI issued2008 · 63% of these records are older, 31% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2003 · median 2002 among the 1,538 with a school on file
- Record last updated2022 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Rancho Cucamonga → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Hussein Abidali, DORancho Cucamonga, CA 917301205274768
- Deborah Anghesom-Negusse, MDRancho Cucamonga, CA 917301780862169
- Muhammad Hammami, M.D.Rancho Cucamonga, CA 917301073801809
- Bhavesh Patel, M.D.Rancho Cucamonga, CA 917301952543514
- Arwa Zakaria, DORancho Cucamonga, CA 917301184037046
- Shahnawaz Jaffer, M.D.Covina, CA 917231649301698
- Michael Oliver, MDCovina, CA 917231487613014
- Syed Mohsin SaghirCovina, CA 917221225569494
Common questions
What is Andrea S. Tieng, M.D.'s NPI number?
Andrea S. Tieng, M.D.'s National Provider Identifier (NPI) is 1356528566, issued on Jan 30, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Andrea S. Tieng, M.D. located?
The NPPES record lists a practice address at 10801 Foothill Blvd Ste 106, Rancho Cucamonga, CA, 91730. Phone: (909) 255-7200. Providers update this record themselves, so call before visiting.
How can I verify Andrea S. Tieng, M.D.'s license?
NPPES lists California license number A106477, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrea S. Tieng, M.D. prescribe under Medicare Part D?
In 2024, Andrea S. Tieng, M.D. had 902 Medicare Part D claims for 619 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.