Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Stephen Walter Phelps, PSYD

Psychologist in Guilderland, NY · enumerated 2006.

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

National Provider Identifier

1851488357

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mr. Stephen Walter Phelps

Credential PSYD

Sex Male

Practice address 2280 Western Ave, Guilderland, NY, 12084

Phone (518) 456-5056

Fax (518) 456-6512

Enumeration date Oct 6, 2006

Last updated in NPPES Jul 10, 2007

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 010375-1 (NY) Primary

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

Other identifiers

Identifier	Type	State	Issuer
01700054	Medicaid	NY	-

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

Where does Stephen Phelps practice?

The practice location on file with NPPES is in Guilderland, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stephen Phelps?

The National Provider Identifier (NPI) for Stephen Phelps is 1851488357, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-10.