Willis Chang, M.D.
Infectious Disease Physician · Ewa Beach, HI
Willis Chang, M.D. is an infectious disease physician with a practice address in Ewa Beach, Hawaii, and NPI 1558306720, issued on Jun 19, 2006. Check the license (Hawaii 6115, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Willis Chang
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 6115 HI
Self-reported in NPPES; status is on the state search - Practice location
- 91-2139 Fort Weaver Road, Ewa Beach, HI 96706
- Phone
- (808) 671-2456
- Enumerated
- Jun 19, 2006
- Record last updated
- Oct 11, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00661001 HI
- Medicare enrollment
- Enrolled (PECOS I20060104000548); accepts Medicare assignment
- Medical or professional school
- University Of Hawaii John A. Burns School Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 42 in Hawaii → Look up another NPI →
Verify Willis Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license 6115Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average infectious disease physician in 2024
229 Medicare Part D claims for 20 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims.
Most prescribed
- Biktarvy41 claims
- Ritonavir27 claims
- Ethambutol Hcl26 claims
- Darunavir22 claims
- Azithromycin14 claims
- Genvoya12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $758.70
29 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 3,895 providers of this specialty with any payment received $4,362.19 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Willis Chang among 42 infectious disease physician records in Hawaii
Willis Chang, M.D. is one of 42 infectious disease physician records with a practice address in Hawaii. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 55% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1986 · median 2003 among the 29 with a school on file
- Record last updated2007 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Hawaii
There are 42 infectious disease physician records in Hawaii.
All 42 in Hawaii → Every provider in Ewa Beach → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Clayton Foster, MDKailua Kona, HI 967401003105255
- Heidi HilleslandLihue, HI 967661922325349
- Devin Lee, MDWailuku, HI 967931588197842
- John Vaz, MDWailuku, HI 967931952556201
- James Williams, MDWailuku, HI 967931497753594
- Christine Akamine, M.D.Honolulu, HI 968131154709764
- Erlaine Bello, MDHonolulu, HI 968131265588065
- Steven Berman, M.D.Honolulu, HI 968131245207182
Common questions
What is Willis Chang, M.D.'s NPI number?
Willis Chang, M.D.'s National Provider Identifier (NPI) is 1558306720, issued on Jun 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Willis Chang, M.D. located?
The NPPES record lists a practice address at 91-2139 Fort Weaver Road, Ewa Beach, HI, 96706. Phone: (808) 671-2456. Providers update this record themselves, so call before visiting.
How can I verify Willis Chang, M.D.'s license?
NPPES lists Hawaii license number 6115, as entered by the provider. Search the Hawaii Medical Board at https://cca.hawaii.gov/pvl/boards/medical/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Willis Chang, M.D. prescribe under Medicare Part D?
In 2024, Willis Chang, M.D. had 229 Medicare Part D claims for 20 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.