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DR. WILLIAM TSAI D.O.
NPI 1285620443
Family Medicine in Upland, CA

Active since September 23, 2005PECOS EnrolledAccepts Medicare AssignmentCLIA 05D0977156 · Waiver
510 N 13TH AVE STE 101, UPLAND, CA 91786(909) 985-8838(909) 985-8899 Get Directions Write a Review

NPPES record last updated: April 24, 2024. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. William Tsai D.o. NPPES

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

DR. WILLIAM TSAI D.O. (NPI 1285620443) is an individual family medicine provider in Upland, California, licensed in California (20A7115) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through August 21, 2026, and is a graduate of Other (1996).

NPPES Registry Identity

NPI1285620443
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. WILLIAM TSAICredential: D.O.
Location Address510 N 13TH AVE STE 101Upland, CA 91786-4973
Mailing Address510 N 13th Ave Ste 101Upland, CA 91786-4973 · (909) 985-8838 · Fax (909) 398-0187
Phone(909) 985-8838
Fax(909) 985-8899
Sole ProprietorNo
Medical School CMSOtherGraduated 1996
Enumeration DateSeptember 23, 2005
Last NPPES UpdateApril 24, 2024
NPPES CertifiedApril 24, 2024
✔ NPI 1285620443 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · 20A7115
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
510 N 13TH AVE STE 101, Upland, CA 91786
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Other Identifiers 1

Medicaid00AX71150CA

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. William Tsai D.o. 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 ID4082512959
PECOS Enrollment IDI20031230000277
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.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D0977156

William Tsai Do Inc · Upland, CA
Active · expires Aug 21, 2026
CLIA Number05D0977156
Laboratory TypePhysician Office
Certificate Effective DateAugust 22, 2024
Certificate Expiration DateAugust 21, 2026
Laboratory DirectorWilliam T. Tsai MD
Laboratory Phone(909) 985-8838
Laboratory LocationWilliam Tsai Do Inc510 N 13th Ave Ste 101, Upland, CA 91786
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 8

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.

Advance care planning, first 30 minutes 99497
Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.
207 services20 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.
164 services60 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
155 services20 patients
Telephone medical discussion with physician, 11-20 minutes 99442
This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.
44 services23 patients
Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more 99306
An initial nursing facility visit is your first meeting with your healthcare team at a nursing facility. Lasting typically 45 minutes, this appointment involves a comprehensive health assessment and the creation of your personalized care plan. It's a crucial step to ensure your health and well-being.
21 services12 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.
15 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91786 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
$91.88 typical visit price
range $59.60 – $179.42
Typical copayment $22.97 (range $14.90 – $44.85)
Most-billed visit code 99203
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.

Referred Medical Equipment & Supplies CMS DME claims 13

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
14 suppliers40 claims77 services$5.66 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
11 suppliers25 claims29 services$0.86 avg. paid by Medicare
Tape, waterproof, per 18 square inches A4452
DME-Medical/Surgical Supplies · category DA000N
1 supplier14 claims1,684 services$0.37 avg. paid by Medicare
Tracheostomy, inner cannula A4623
DME-Orthotic Devices · category DF000N
1 supplier15 claims455 services$5.40 avg. paid by Medicare
Tracheostomy care kit for established tracheostomy A4629
DME-Orthotic Devices · category DF000N
1 supplier15 claims455 services$4.48 avg. paid by Medicare
Specialty absorptive dressing, wound cover, sterile, pad size more than 16 sq. in. but less than or equal to 48 sq. in., without adhesive border, each dressing A6252
DME-Medical/Surgical Supplies · category DA023N
1 supplier17 claims570 services$3.14 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

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

LISA CHI
Nurse Practitioner (Family)
510 N 13TH AVE STE 101
UPLAND, CA 91786
San Bernardino County (909) 985-8838
JIE LIN
Nurse Practitioner (Family)
510 N 13TH AVE STE 101
UPLAND, CA 91786
San Bernardino County (909) 985-8838
WILLIAM TSAI D O INC
Family Medicine
510 N 13TH AVE STE 101
UPLAND, CA 91786
San Bernardino County (909) 985-8838

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 Tsai's NPI number?

The NPI number for William Tsai is 1285620443. It was assigned to this individual provider in the NPPES registry on September 23, 2005.

Where is William Tsai located?

William Tsai practices at 510 N 13th Ave Ste 101, Upland, CA 91786. The listed phone number is (909) 985-8838.

What is William Tsai's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is William Tsai enrolled in Medicare?

Yes. William Tsai 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.

Does William Tsai hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0977156) is associated with this NPI, valid through August 21, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for William Tsai was last updated on April 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.