Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Daniel J Costello, M.D.

Neurology Physician in Boston, MA · enumerated 2006.

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

National Provider Identifier

1033197116

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Registry record

Entity type Individual (Type 1)

Name Daniel J Costello

Credential M.D.

Sex Male

Practice address Massachusetts General Hospital, Wacc 835, 55 Fruit Street, Boston, MA, 02114

Phone (617) 726-2000

Enumeration date Jan 9, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 221367 (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
2120836	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

What specialty is Daniel Costello?

Daniel Costello is registered in NPPES with the primary taxonomy of Neurology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.