Dr William S Loui, MD - Medicare Hematology/oncology in Honolulu, HI

Dr William S Loui, MD is a medicare enrolled "Internal Medicine - Hematology & Oncology" physician in Honolulu, Hawaii. He went to University Of Hawaii John A. Burns School Of Medicine and graduated in 1989 and has 35 years of diverse experience with area of expertise as Hematology/oncology. He is a member of the group practice Castle Medical Center and his current practice location is 1329 Lusitana St Ste 307, Honolulu, Hawaii. You can reach out to his office (for appointments etc.) via phone at (808) 524-6115.

Dr William S Loui is licensed to practice in Hawaii (license number MD10912) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1346217718.

Contact Information

Dr William S Loui, MD
1329 Lusitana St Ste 307,
Honolulu, HI 96813-2435
(808) 524-6115
(808) 528-1711

Map and Direction




Physician's Profile

Full NameDr William S Loui
GenderMale
SpecialityHematology/oncology
Experience35 Years
Location1329 Lusitana St Ste 307, Honolulu, Hawaii
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr William S Loui attended and graduated from University Of Hawaii John A. Burns School Of Medicine in 1989
  NPI Data:
  • NPI Number: 1346217718
  • Provider Enumeration Date: 03/03/2006
  • Last Update Date: 03/31/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 0840372835
  • Enrollment ID: I20101210000226

Medical Identifiers

Medical identifiers for Dr William S Loui such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1346217718NPI-NPPES
49311401MedicaidHI
0221218OtherHIHMSA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology MD10912 (Hawaii)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Adventist Health Home Care ServicesKaneohe, HIHome health agency
Adventist Health CastleKailua, HIHospital
The Queens Medical CenterHonolulu, HIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Castle Medical Center660876277865

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr William S Loui allows following entities to bill medicare on his behalf.
Entity NameCastle Medical Center
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1316937691
PECOS PAC ID: 6608762778
Enrollment ID: O20040225000693

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr William S Loui is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr William S Loui, MD
640 Ulukahiki St,
Kailua, HI 96734-4454

Ph: (808) 263-5011
Dr William S Loui, MD
1329 Lusitana St Ste 307,
Honolulu, HI 96813-2435

Ph: (808) 524-6115

Reviews and Comments


Internal Medicine Doctors in Honolulu, HI

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Phone: 808-392-3286    
Dr. Elizabeth G Quinn, MD
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Phone: 808-432-2303    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

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