Joel E.h. Kobayashi, M.D.
Internal Medicine Physician · Aiea, HI
Joel E.h. Kobayashi, M.D. is an internal medicine physician with a practice address in Aiea, Hawaii, and NPI 1679671838, issued on Sep 20, 2006. Check the license (Hawaii 9742, as entered in NPPES) on the Hawaii Medical Board; the Medicare figures below come from public CMS files.
- Name
- Joel E.h. Kobayashi
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 9742 HI
Self-reported in NPPES; status is on the state search - Practice location
- 98-1247 Kaahumanu St, Aiea, HI 96701
- Phone
- (808) 487-5115
- Enumerated
- Sep 20, 2006
- Record last updated
- Feb 15, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (808) 488-8266
- Medicare enrollment
- Enrolled (PECOS I20040318000975); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 902 in Hawaii → Look up another NPI →
Also registered at 98-1247 Kaahumanu St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joel E.h. Kobayashi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersHawaii Medical Board
Search for license 9742Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% more Medicare Part D claims than the average internal medicine physician in 2024
5,521 Medicare Part D claims for 383 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 30 claims were for opioids.
Most prescribed
- Atorvastatin Calcium297 claims
- Pravastatin Sodium229 claims
- Amlodipine Besylate228 claims
- Simvastatin224 claims
- Metoprolol Succinate221 claims
- Lisinopril213 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.
The MIPS final score for 2023 (Medicare payment program): 64.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,253.38
62 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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.
Joel E.h. Kobayashi among 902 internal medicine physician records in Hawaii
Joel E.h. Kobayashi, 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 55% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated1993 · median 2001 among the 491 with a school on file
- Record last updated2018 · 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).
36 internal medicine physician records list a practice address in Aiea
They are 36 of the 1,481 NPPES records with a practice address in Aiea, and 902 internal medicine physician records in Hawaii.
All 902 in Hawaii → Every provider in Aiea → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Francis Buto, M.D.Aiea, HI 967011124061189
- Shayne Castanera, M.D.Aiea, HI 967011053337469
- Michael Dimitrion, MDAiea, HI 967011508878836
- Alvin Fuse, M.D.Aiea, HI 967011871536011
- Craig Hamasaki, M.D.Aiea, HI 967011003870478
- Ky Le, MDAiea, HI 967011073560025
- Bryan Matsumoto, M.D.Aiea, HI 967011932142072
- Michael Mihara, M.D.Aiea, HI 967011750324919
Common questions
What is Joel E.h. Kobayashi, M.D.'s NPI number?
Joel E.h. Kobayashi, M.D.'s National Provider Identifier (NPI) is 1679671838, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joel E.h. Kobayashi, M.D. located?
The NPPES record lists a practice address at 98-1247 Kaahumanu St, Aiea, HI, 96701. Phone: (808) 487-5115. Providers update this record themselves, so call before visiting.
How can I verify Joel E.h. Kobayashi, M.D.'s license?
NPPES lists Hawaii license number 9742, 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 Joel E.h. Kobayashi, M.D. prescribe under Medicare Part D?
In 2024, Joel E.h. Kobayashi, M.D. had 5,521 Medicare Part D claims for 383 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Joel E.h. Kobayashi, M.D.'s MIPS final score?
The 2023 MIPS final score is 64.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.