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DR. ANDREA S. TIENG M.D.
NPI 1356528566
Internal Medicine - Gastroenterology in Rancho Cucamonga, CA

Active since January 30, 2008PECOS EnrolledAccepts Medicare Assignment
10801 FOOTHILL BLVD STE 106, RANCHO CUCAMONGA, CA 91730(909) 255-7200(909) 255-7215 Get Directions Write a Review

NPPES record last updated: January 27, 2022. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jan 27, 2022, Feb 10, 2020, Jun 12, 2018 and 1 more (4 updates tracked since 2017).

About Dr. Andrea S. Tieng M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ANDREA S. TIENG M.D. (NPI 1356528566) is an individual gastroenterology provider in Rancho Cucamonga, California, licensed in California (A106477) and active in the NPI registry since January 2008. She is enrolled in Medicare PECOS and is a graduate of Other (2003).

NPPES Registry Identity

NPI1356528566
Entity TypeIndividualFemale
Primary Taxonomy207RG0100X
Provider Legal NameDR. ANDREA S. TIENGCredential: M.D.
Location Address10801 FOOTHILL BLVD STE 106Rancho Cucamonga, CA 91730-7695
Mailing Address10801 Foothill Blvd Ste 106Rancho Cucamonga, CA 91730-7695 · (909) 255-7200 · Fax (909) 255-7215
Phone(909) 255-7200
Fax(909) 255-7215
Sole ProprietorYes
Medical School CMSOtherGraduated 2003
Enumeration DateJanuary 30, 2008
Last NPPES UpdateJanuary 27, 20224 updates tracked since enumeration
NPPES CertifiedJanuary 27, 2022
✔ NPI 1356528566 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Licenses✔ Licensed in CA · A106477✔ Licensed in NY · 241597
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
10801 FOOTHILL BLVD STE 106, Rancho Cucamonga, CA 91730
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Other Identifiers 2

OtherA106477CA · Medical License
Other241597NY · Medical License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Andrea S. Tieng M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9133256860
PECOS Enrollment IDI20100428000624
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385
This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
33 services31 patients
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 G0500
Moderate sedation is a method where a physician uses medication to help you relax during a gastrointestinal endoscopy. An independent trained observer will be present to monitor your vital signs and ensure your safety throughout the procedure. It's a common and safe practice.
32 services32 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
22 services22 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
22 services22 patients
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121
Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.
17 services17 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
16 services14 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91730 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$136.04 typical visit price
range $59.60 – $179.42
Typical copayment $34.01 (range $14.90 – $44.85)
Most-billed visit code 99204
Established Patient
$104.64 typical visit price
range $19.37 – $146.42
Typical copayment $26.16 (range $4.84 – $36.60)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
Percentage of patients aged 18 years and older with a BMI documented during the current encounter or during the previous twelve months AND with a BMI outside of normal parameters, a follow-up plan is documented during the encounter or during the previous…
100%84 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Andrea Tieng's NPI number?

The NPI number for Andrea Tieng is 1356528566. It was assigned to this individual provider in the NPPES registry on January 30, 2008.

Where is Andrea Tieng located?

Andrea Tieng practices at 10801 Foothill Blvd Ste 106, Rancho Cucamonga, CA 91730. The listed phone number is (909) 255-7200.

What is Andrea Tieng's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Andrea Tieng enrolled in Medicare?

Yes. Andrea Tieng is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Andrea Tieng was last updated on January 27, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.