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DR. WILLIAM HSU MD
NPI 1326669276
Anesthesiology in Duarte, CA

Active since May 01, 2020PECOS EnrolledAccepts Medicare Assignment
1500 DUARTE RD, DUARTE, CA 91010(800) 826-4673 Get Directions Write a Review

NPPES record last updated: July 8, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. William Hsu Md NPPES

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

DR. WILLIAM HSU MD (NPI 1326669276) is an individual anesthesiology provider in Duarte, California, licensed in California (A209789) and active in the NPI registry since May 2020. He is enrolled in Medicare PECOS, is affiliated with Albany Medical Center Hospital, and is a graduate of Other (2020).

NPPES Registry Identity

NPI1326669276
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameDR. WILLIAM HSUCredential: MD
Location Address1500 DUARTE RDDuarte, CA 91010-3012
Mailing AddressPo Box 512185Los Angeles, CA 90051-0185
Phone(800) 826-4673
Sole ProprietorNo
Medical School CMSOtherGraduated 2020
Enumeration DateMay 1, 2020
Last NPPES UpdateJuly 8, 2026
NPPES CertifiedJuly 8, 2026
✔ NPI 1326669276 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
Licenses✔ Licensed in CA · A209789✔ Licensed in MD · D0101574
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
1500 DUARTE RD, Duarte, CA 91010
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William Hsu 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 ID6800326588
PECOS Enrollment IDI20250903001059, I20260619001144
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.

Medicare Billing Reassignments

3

Medicare enrollment records show William Hsu reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

City Of Hope Medical Foundation
0.1 mi
Hematology & Oncology
1500 DUARTE RD
Duarte, CA 91010
  • Reassigned Medicare billing, California enrollment
  • 1,335 clinicians in this Medicare group
NPI 1871886366 (626) 256-4673
Johns Hopkins University
2,278 mi
Neurological Surgery
8600 OLD GEORGETOWN RD
Bethesda, MD 20814
  • Reassigned Medicare billing, Maryland enrollment
  • 4,483 clinicians in this Medicare group
NPI 1578569240 (410) 955-5000
Albany Medical College
2,441 mi
Allergy & Immunology
47 NEW SCOTLAND AVE
Albany, NY 12208
  • Reassigned Medicare billing, New York enrollment
  • 1,640 clinicians in this Medicare group
NPI 1497921688 (518) 262-9600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Albany Medical Center Hospital

Acute Care Hospitals · Albany, NY
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330013
Location43 New Scotland Avenue, Mail Code 34Albany, NY 12208 · Albany County
Emergency services Birthing friendly

Other Providers at the Same Location NPPES 20

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

SASAN FAZELI M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 256-4673
SKAI MINDY FU PHARMD
Pharmacist
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 500-5461
JIMMIE WONG MD
Radiology (Diagnostic Radiology)
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
TERENCE WILLIAMS M.D.
Radiology (Radiation Oncology)
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 256-4673
DR. MUSTAFA RAOOF M.D.
Surgery (Surgical Oncology)
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 256-4673
DR. EDNA CLOGG SHENVI M.D.
Surgery
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 256-4673
ALAN CHEN TANG M.D.
Anesthesiology
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
WINSTON YUHSIEN LEE MD, PHD
Pathology (Hematology)
1500 DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 256-4673

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 Hsu's NPI number?

The NPI number for William Hsu is 1326669276. It was assigned to this individual provider in the NPPES registry on May 1, 2020.

Where is William Hsu located?

William Hsu practices at 1500 Duarte Rd, Duarte, CA 91010. The listed phone number is (800) 826-4673.

What is William Hsu's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is William Hsu enrolled in Medicare?

Yes. William Hsu 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.

Which organizations bill Medicare for William Hsu's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Hsu reassigns Medicare benefits to 3 organizations: City Of Hope Medical Foundation (Duarte, CA), Johns Hopkins University (Bethesda, MD) and Albany Medical College (Albany, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Hsu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is William Hsu affiliated with any hospitals?

According to CMS data, William Hsu is affiliated with Albany Medical Center Hospital.

When was this NPI record last updated?

The NPPES record for William Hsu was last updated on July 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.