Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ariel Eyllsse Hirsch, MD

Radiation Oncology Physician in Boston, MA · enumerated 2006.

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

National Provider Identifier

1992783781

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Registry record

Entity type Individual (Type 1)

Name Dr. Ariel Eyllsse Hirsch

Credential MD

Sex Female

Practice address 830 Harrison Ave, Moakley Building Ll100, Boston, MA, 02118

Phone (617) 638-7070

Fax (617) 638-7037

Enumeration date Jan 3, 2006

Last updated in NPPES Mar 3, 2021

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 221091 (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
110038822A	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

Is NPI 1992783781 active?

Yes, as of the latest NPPES snapshot, NPI 1992783781 is active (record last updated 2021-03-03).

How do I verify Ariel Hirsch's NPI record?

Cross-check NPI 1992783781 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-03.