William Portman, M.D.
Psychiatry Physician · Honolulu, HI
William Portman, M.D. is a psychiatry physician with a practice address in Honolulu, Hawaii, and NPI 1639551294, issued on Jun 19, 2015. Check the license (Hawaii MD20259, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Portman
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- MD20259 HI
A168551 CA
Self-reported in NPPES; status is on the state search - Practice location
- 604 Koko Isle Cir, Honolulu, HI 96825
- Phone
- (405) 590-3825
- Enumerated
- Jun 19, 2015
- Record last updated
- Apr 21, 2026
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 331 in Hawaii → Look up another NPI →
Verify William Portman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license MD20259Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average psychiatry physician in 2024
210 Medicare Part D claims for 52 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Quetiapine Fumarate14 claims
- Alprazolam12 claims
- Clonazepam11 claims
- Diazepam11 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.
William Portman among 331 psychiatry physician records in Hawaii
William Portman, M.D. is one of 331 psychiatry physician records with a practice address in Hawaii. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 73% of them.
- NPI issued2015 · 73% of these records are older, 25% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileNo · 33% of these records are
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
175 psychiatry physician records list a practice address in Honolulu
They are 175 of the 12,408 NPPES records with a practice address in Honolulu, and 331 psychiatry physician records in Hawaii.
All 331 in Hawaii → Every provider in Honolulu → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Richard Chung, MDHonolulu, HI 968251366784761
- Peter Collori, MDHonolulu, HI 968251336242791
- David FriarHonolulu, HI 968251235265828
- Janice Montgomery-Suber, FNPHonolulu, HI 968251578723300
- John Neuhaus, M.D.Honolulu, HI 968251700085321
- Lisa Ryan, M.D.Honolulu, HI 968251467415786
- Thomas Cook, M.D.Honolulu, HI 968261497989149
- Rika Suzuki, M.D.Honolulu, HI 968231649472804
Common questions
What is William Portman, M.D.'s NPI number?
William Portman, M.D.'s National Provider Identifier (NPI) is 1639551294, issued on Jun 19, 2015. An NPI identifies a provider in billing; it is not a license.
Where is William Portman, M.D. located?
The NPPES record lists a practice address at 604 Koko Isle Cir, Honolulu, HI, 96825. Phone: (405) 590-3825. Providers update this record themselves, so call before visiting.
How can I verify William Portman, M.D.'s license?
NPPES lists Hawaii license number MD20259, 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 William Portman, M.D. prescribe under Medicare Part D?
In 2024, William Portman, M.D. had 210 Medicare Part D claims for 52 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.