Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marissa Lynne Peifer, PSY.D.

Psychologist in Boston, MA · enumerated 2008.

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

National Provider Identifier

1588811749

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Registry record

Entity type Individual (Type 1)

Name Dr. Marissa Lynne Peifer

Credential PSY.D.

Sex Female

Practice address 185 Devonshire St, Suite 803, Boston, MA, 02110

Phone (617) 259-1895

Enumeration date Aug 19, 2008

Last updated in NPPES Nov 15, 2010

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

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

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.

What specialty is Marissa Peifer?

Marissa Peifer is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-15.