Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. William S. Loui, MD

Individual provider Hematology & Oncology Physician · NPI 1346217718

Dr. William S. Loui, MD is a Hematology/Oncology in Honolulu, Hawaii. Graduated from University of Hawaii John A. Burns School of Medicine in 1989, 37 years ago. Practices with Castle Medical Center, a 77-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Hawaii.

Years since qualifying
37
Trained at
University of Hawaii John A. Burns School of Medicine
Licensed in
HI
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1329 Lusitana St Ste 307
Honolulu, HI 96813-2435
Phone: (808) 524-6115
Fax: (808) 528-1711
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence MD10912 (HI)

Record details

NPI number1346217718
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 3, 2006
Last updated in NPPESMarch 31, 2021
Certification dateMarch 31, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF HAWAII JOHN A. BURNS SCHOOL OF MEDICINE
Graduated 1989 (37 years in practice)
Group practice Castle Medical Center — 77 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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