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

Halsey Newbrough Simmons, M.F.T.

Marriage & Family Therapist in Pleasant Hill, CA · enumerated 2006.

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

National Provider Identifier

1164585444

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Registry record

Entity type Individual (Type 1)

Name Halsey Newbrough Simmons

Credential M.F.T.

Sex Male

Practice address Pleasant Hill, CA, 94523

Phone (707) 315-8889

Fax (888) 488-6656

Enumeration date Dec 18, 2006

Last updated in NPPES Mar 18, 2025

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

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 30120 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
30120	Other	CA	LICENSE NUMBER

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 is the NPI number for Halsey Simmons?

The National Provider Identifier (NPI) for Halsey Simmons is 1164585444, a Type 1 (individual) record in the CMS NPPES registry.

Where does Halsey Simmons practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-18.