NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Robert Joseph Marsillo, D.C.

Chiropractor in Darien, CT · enumerated 2006.

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

National Provider Identifier

1639132210

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Registry record

Entity type Individual (Type 1)
Name Dr. Robert Joseph Marsillo
Credential D.C.
Sex Male
Practice address Darien, CT, 06820
Phone (203) 656-2044
Fax (203) 656-2042
Enumeration date Apr 6, 2006
Last updated in NPPES Aug 17, 2018

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 634 (CT) Primary
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Other identifiers

Identifier Type State Issuer
050000634CT01 Other CT BC/BS
P463905 Other CT OXFORD
4334475 Other CT AETNA

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.

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Frequently asked questions

What is the NPI number for Robert Marsillo?
The National Provider Identifier (NPI) for Robert Marsillo is 1639132210, a Type 1 (individual) record in the CMS NPPES registry.
Where does Robert Marsillo practice?
The practice location on file with NPPES is in Darien, CT. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-17.