Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Carlos Fernandez-Del Castillo, MD

Q: What is the NPI number for Carlos Fernandez-Del Castillo, MD?

The NPI for Carlos Fernandez-Del Castillo, MD is 1699969006, a Type 2 (organization) record in the CMS NPPES registry.

Surgery Physician in Boston, MA · enumerated 2007 · authorized official Carlos Fernandez-Del Castillo, Provider.

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

National Provider Identifier

1699969006

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Registry record

Entity type Organization (Type 2)

Legal business name Carlos Fernandez-Del Castillo, MD

Practice address 15 Parkman St, Wac 460, Boston, MA, 02114

Phone (617) 726-5644

Fax (617) 724-3383

Enumeration date Aug 29, 2007

Last updated in NPPES Aug 29, 2007

Taxonomy & classification

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 78466 (MA) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 78466 (MA) Primary

Authorized official

Name Carlos Fernandez-Del Castillo

Title Provider

Phone (617) 726-5644

Other identifiers

Identifier	Type	State	Issuer
722156	Other	MA	TUFTS
3081826	Medicaid	MA	-
M18870	Other	MA	BLUE SHIELD

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 is the NPI number for Carlos Fernandez-Del Castillo, MD?

The NPI for Carlos Fernandez-Del Castillo, MD is 1699969006, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Carlos Fernandez-Del Castillo, MD?

NPPES lists Carlos Fernandez-Del Castillo (Provider) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-08-29.