Mark K. Koizumi, D.D.S.
General Practice Dentistry · Hilo, HI
Mark K. Koizumi, D.D.S. is a general practice dentistry with a practice address in Hilo, Hawaii, and NPI 1366797425, issued on Jul 16, 2012. Check the license (Hawaii DT-1380, as entered in NPPES) with the Hawaii board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark K. Koizumi
- Credential
- D.D.S.
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- DT-1380 HI
Self-reported in NPPES; status is on the state search - Practice location
- 275 Ponahawai St, Hilo, HI 96720
- Phone
- (808) 935-1149
- Enumerated
- Jul 16, 2012
- Record last updated
- Jul 16, 2012 (not updated in 14 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 275 Ponahawai St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- George Atebara, DDSGeneral Practice Dentistry1629227566
- Robert Atebara, DMDPeriodontics1740256023
- Darrett Choy, M.D.Pediatrics Physician1770783375
- William Hayakawa, D.D.S.General Practice Dentistry1225330889
- Ammon Kau, DDSDentist1497028138
- Ruth Ohata, D.M.D.Pediatric Dentistry1780719500
Verify Mark K. Koizumi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Hawaii board licenses this profession
Search for license DT-1380Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average general practice dentistry in 2024
60 Medicare Part D claims for 38 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin36 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.
43 general practice dentistry records list a practice address in Hilo
They are 43 of the 1,758 NPPES records with a practice address in Hilo, and 692 general practice dentistry records in Hawaii.
All 43 in Hilo → All 692 in Hawaii → Every provider in Hilo →
Other general practice dentistry records in Hawaii
- Dana Adachi, DDSHonolulu, HI1245799642
- Gerald Adachi, DMDHonolulu, HI1609082221
- Maria Adora, DMDHonolulu, HI1447482633
- Kern Agader, D.M.D.Kapolei, HI1831246610
- Stewart Ahn, DDSMililani, HI1619939725
- Edmund Akioka, DDSHonokaa, HI1295892545
- Edward Akioka, DDSHonokaa, HI1487492856
- Jason Ako, D.D.S.Honolulu, HI1013930452
- Genara Alcantra, DMDKapolei, HI1598896987
- Terry Allen, DDSLihue, HI1407909401
Common questions
What is Mark K. Koizumi, D.D.S.'s NPI number?
Mark K. Koizumi, D.D.S.'s National Provider Identifier (NPI) is 1366797425, issued on Jul 16, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Mark K. Koizumi, D.D.S. located?
The NPPES record lists a practice address at 275 Ponahawai St, Hilo, HI, 96720. Phone: (808) 935-1149. Providers update this record themselves, so call before visiting.
How can I verify Mark K. Koizumi, D.D.S.'s license?
NPPES lists Hawaii license number DT-1380, as entered by the provider. Search the Hawaii board that licenses this profession; the NPPES record confirms identity only.
How much does Mark K. Koizumi, D.D.S. prescribe under Medicare Part D?
In 2024, Mark K. Koizumi, D.D.S. had 60 Medicare Part D claims for 38 beneficiaries; the average among general practice dentistry prescribers was 83. 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.