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

Robert C Reff, PHD

Psychologist in Green Bay, WI · enumerated 2017.

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

National Provider Identifier

1871006536

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Registry record

Entity type Individual (Type 1)

Name Robert C Reff

Credential PHD

Sex Male

Practice address Green Bay, WI, 54311

Phone (920) 288-5630

Enumeration date Nov 15, 2017

Last updated in NPPES Apr 14, 2025

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

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers · License LH60807146 (WA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PY60807140 (WA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 2914 (OR) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3659-57 (WI) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
100086951	Medicaid	WI	-

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 specialty is Robert Reff?

Robert Reff 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.

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 2025-04-14.