Andrea Tieng, M.D.
NPI 1356528566 · Gastroenterology Physician · Rancho Cucamonga, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrea Tieng, M.D. is a Gastroenterology Physician provider in Rancho Cucamonga, CA (NPI 1356528566).
Provider details
- NPI number
- 1356528566
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 241597 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
153 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 33 | $252 |
| 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 MonitoG0500 | 32 | $6 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 22 | $107 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 22 | $115 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High RiskG0121 | 17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 362 | 340 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 140 | 127 |
| Pantoprazole Sodium | 108 | 61 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 81 | 74 |
| Eluxadolinebrand: Viberzi | 36 | — |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 24 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$252 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-01-30
- Last updated
- 2022-01-27
- Certified
- 2022-01-27
Frequently asked questions
- What is Andrea Tieng's NPI number?
- Andrea Tieng's National Provider Identifier (NPI) is 1356528566, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrea Tieng's specialty?
- Andrea Tieng is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrea Tieng located?
- Andrea Tieng's practice location on file with NPPES is 10801 Foothill Blvd Ste 106, Rancho Cucamonga, CA 91730-7695.
- What is Andrea Tieng's phone number?
- The practice phone number listed in the NPPES registry for Andrea Tieng is (909) 255-7200.
- Does Andrea Tieng accept Medicare?
- Andrea Tieng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrea Tieng's NPI active?
- Yes — Andrea Tieng's NPI (1356528566) is active in the NPPES registry as of the last update on 2022-01-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.