WILLIAM SHUN TZENG MD
NPI 1649809385
Internal Medicine in Hacienda Heights, CA

Q: What is William Tzeng's NPI number?

The NPI number for William Tzeng is 1649809385. It was assigned to this individual provider in the NPPES registry on April 4, 2020.

Q: What is William Tzeng's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for William Tzeng was last updated on September 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.

Active since April 04, 2020PECOS EnrolledAccepts Medicare Assignment

46.94/100

CMS Quality Rating

17170 COLIMA RD STE G, HACIENDA HEIGHTS, CA 91745(626) 965-8202(626) 964-9893 Get Directions Write a Review

NPPES record last updated: September 3, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Sep 3, 2025, Apr 4, 2020 (2 updates tracked since 2020).

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About William Shun Tzeng Md NPPES

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

WILLIAM SHUN TZENG MD (NPI 1649809385) is an individual internal medicine provider in Hacienda Heights, California, licensed in California (A187692) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2020).

NPPES Registry Identity

NPI1649809385

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameWILLIAM SHUN TZENGCredential: MD

Location Address17170 COLIMA RD STE GHacienda Heights, CA 91745-6771

Mailing Address17170 Colima Rd Ste GHacienda Heights, CA 91745-6771 · (626) 965-8202 · Fax (626) 964-9893

Phone(626) 965-8202

Fax(626) 964-9893

Sole ProprietorNo

Medical School CMSWashington University School Of MedicineGraduated 2020

Enumeration DateApril 4, 2020

Last NPPES UpdateSeptember 3, 20252 updates tracked since enumeration

NPPES CertifiedSeptember 3, 2025

✔ NPI 1649809385 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CA · A187692

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

17170 COLIMA RD STE G, Hacienda Heights, CA 91745

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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

William Shun Tzeng Md 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 ID4183047301

PECOS Enrollment IDI20230907002994

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 3

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.

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.

56 services39 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

36 services27 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

18 services18 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91745 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

$142.39 typical visit price

range $62.96 – $187.60

Typical copayment $35.59 (range $15.74 – $46.90)

Most-billed visit code 99204

Established Patient

$109.96 typical visit price

range $20.84 – $153.61

Typical copayment $27.49 (range $5.21 – $38.40)

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.

46.94/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

55.85

Promoting Interoperability

100

Improvement Activities

Cost

17.29

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

HSIU-HUNG SU FNP-C

Nurse Practitioner (Family)

17170 COLIMA RD STE G
HACIENDA HEIGHTS, CA 91745

Los Angeles County (626) 810-0706

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 William Tzeng's NPI number?

The NPI number for William Tzeng is 1649809385. It was assigned to this individual provider in the NPPES registry on April 4, 2020.

Where is William Tzeng located?

William Tzeng practices at 17170 Colima Rd Ste G, Hacienda Heights, CA 91745. The listed phone number is (626) 965-8202.

What is William Tzeng's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Tzeng enrolled in Medicare?

Yes. William Tzeng 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 William Tzeng was last updated on September 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.