Isao Iwata, M.D.
Geriatric Medicine (Internal Medicine) Physician · Plainsboro, NJ
Isao Iwata, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Plainsboro, New Jersey, and NPI 1295921773, issued on Sep 19, 2007. Check the license (New Jersey 25MA09972900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Isao Iwata
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 25MA09972900 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 5 Plainsboro RD Ste 300, Plainsboro, NJ 08536
- Phone
- (609) 853-7272
- Enumerated
- Sep 19, 2007
- Record last updated
- Sep 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (609) 853-7271
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 165 in New Jersey → Look up another NPI →
Also registered at 5 Plainsboro RD Ste 300
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lisa Motavalli, M.D.Cardiovascular Disease Physician1497962815
- Arun Rao, M.D.Internal Medicine Physician1972690048
Verify Isao Iwata in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA09972900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
4,604 Medicare Part D claims for 533 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium433 claims
- Rosuvastatin Calcium258 claims
- Amlodipine Besylate251 claims
- Levothyroxine Sodium144 claims
- Hydrochlorothiazide128 claims
- Losartan Potassium127 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.
Isao Iwata among 165 geriatric medicine (internal medicine) physician records in New Jersey
Isao Iwata, M.D. is one of 165 geriatric medicine (internal medicine) physician records with a practice address in New Jersey. 82% 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 58% of them.
- NPI issued2007 · 58% of these records are older, 28% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in New Jersey
There are 165 geriatric medicine (internal medicine) physician records in New Jersey.
All 165 in New Jersey → Every provider in Plainsboro → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Ahmed Mirza, M.D.Plainsboro, NJ 085361114094711
- Kevin Parks, M.D.Plainsboro, NJ 085361982090312
- Qian Wang, MDPlainsboro, NJ 085361417151473
- Ahmad Farooq, M.D., M.S.H.S.Pennington, NJ 085341396754776
- Robert Platzman, D.O.Princeton, NJ 085401497852966
- Harpreet Sidhu, MDPrinceton, NJ 085401346271756
- Stephen Aiello, M.D.Hamilton, NJ 086191831100825
- Katherina Canales, M.D.Ewing, NJ 086281740393412
Common questions
What is Isao Iwata, M.D.'s NPI number?
Isao Iwata, M.D.'s National Provider Identifier (NPI) is 1295921773, issued on Sep 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Isao Iwata, M.D. located?
The NPPES record lists a practice address at 5 Plainsboro RD Ste 300, Plainsboro, NJ, 08536. Phone: (609) 853-7272. Providers update this record themselves, so call before visiting.
How can I verify Isao Iwata, M.D.'s license?
NPPES lists New Jersey license number 25MA09972900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Isao Iwata, M.D. prescribe under Medicare Part D?
In 2024, Isao Iwata, M.D. had 4,604 Medicare Part D claims for 533 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.