Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory L Dayton, RPH

Psychiatric Pharmacist in Salem, OR · enumerated 2006.

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

National Provider Identifier

1194828590

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Registry record

Entity type Individual (Type 1)

Name Gregory L Dayton

Credential RPH

Sex Male

Practice address 2600 Center St Ne, Oregon State Hospital, Salem, OR, 97301

Phone (503) 945-2800

Fax (503) 947-1085

Enumeration date Sep 7, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 6371 (OR) Secondary

1835P1300X Psychiatric Pharmacist Pharmacy Service Providers · License 6371 (OR) Primary

RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy. About the RPH 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Gregory Dayton?

Gregory Dayton is registered in NPPES with the primary taxonomy of Psychiatric Pharmacist. 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.

Other providers at this practice address

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Dhs/Office of Financial Services Irs/Eopc/Bmrc/Eotc/Osh/Osh-P Psychiatric Hospital · Salem, OR NPI 1508802489 Alexander Jones Pharmacist · Salem, OR NPI 1366545766 Merrilee Johnson Pharmacist · Salem, OR NPI 1275636672 Steven Wilson Clinical Psychologist · Salem, OR NPI 1720181134 Albert Chan Psychiatric Pharmacist · Salem, OR NPI 1831292234 Carlene Shultz Psychologist · Salem, OR NPI 1063515476 Lorraine Linder-Skach Psychiatry Physician · Salem, OR NPI 1912001140 Melva Penne Addiction (Substance Use Disorder) Counselor · Salem, OR NPI 1679677926

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.