Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Hikaru Isihara, M.D., PH.D.

Internal Medicine Physician in Braintree, MA · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1598750598

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Registry record

Entity type Individual (Type 1)

Name Dr. Hikaru Isihara

Credential M.D., PH.D.

Sex Male

Practice address 111 Grossman Dr, Braintree, MA, 02184

Phone (781) 849-2241

Fax (781) 849-2520

Enumeration date Sep 15, 2005

Last updated in NPPES Jul 12, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 55750 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
3191338	Medicaid	MA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Hikaru Isihara's NPI record?

Cross-check NPI 1598750598 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1598750598 active?

Yes, as of the latest NPPES snapshot, NPI 1598750598 is active (record last updated 2011-07-12).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-12.