Tomifumi Onishi, M.D
Internal Medicine Physician · Ewa Beach, HI
Tomifumi Onishi, M.D is an internal medicine physician with a practice address in Ewa Beach, Hawaii, and NPI 1861680399, issued on Oct 10, 2007. Check the license on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Tomifumi Onishi
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- N3962 TX
Self-reported in NPPES; status is on the state search - Practice location
- 91-2141 Fort Weaver RD, Ewa Beach, HI 96706
- Phone
- (808) 691-3900
- Enumerated
- Oct 10, 2007
- Record last updated
- Jan 22, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140702002769); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 902 in Hawaii → Look up another NPI →
Also registered at 91-2141 Fort Weaver RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Chi Nga Chan, MDEmergency Medicine Physician1770928038
Verify Tomifumi Onishi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
270 Medicare Part D claims for 125 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Cefdinir25 claims
- Prednisone20 claims
- Doxycycline Hyclate13 claims
- Furosemide13 claims
- Cephalexin11 claims
- Metoprolol Succinate11 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: $124.99
1 payment: food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Queens University Medical GroupHonolulu, HI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tomifumi Onishi among 902 internal medicine physician records in Hawaii
Tomifumi Onishi, M.D is one of 902 internal medicine physician records with a practice address in Hawaii. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 43% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated2003 · median 2001 among the 491 with a school on file
- Record last updated2015 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Hawaii practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 internal medicine physician records list a practice address in Ewa Beach
They are 19 of the 749 NPPES records with a practice address in Ewa Beach, and 902 internal medicine physician records in Hawaii.
All 902 in Hawaii → Every provider in Ewa Beach → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Elmer Baysa, MDEwa Beach, HI 967061699829127
- Roman Cortez, M.D.Ewa Beach, HI 967061568496529
- Shruti Deopujari, MBBSEwa Beach, HI 967061831516863
- Russell Kelly, MDEwa Beach, HI 967061790787729
- Kimberly Kyle, D.OEwa Beach, HI 967061194081901
- Albert Lin, M.D.Ewa Beach, HI 967061235148701
- Glenda Malana, MDEwa Beach, HI 967061639103070
- Aurora Mariani, M.D.Ewa Beach, HI 967061184700353
Common questions
What is Tomifumi Onishi, M.D's NPI number?
Tomifumi Onishi, M.D's National Provider Identifier (NPI) is 1861680399, issued on Oct 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Tomifumi Onishi, M.D located?
The NPPES record lists a practice address at 91-2141 Fort Weaver RD, Ewa Beach, HI, 96706. Phone: (808) 691-3900. Providers update this record themselves, so call before visiting.
How can I verify Tomifumi Onishi, M.D's license?
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 Tomifumi Onishi, M.D prescribe under Medicare Part D?
In 2024, Tomifumi Onishi, M.D had 270 Medicare Part D claims for 125 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.