What is Hilary Arnold's NPI number?

Hilary Arnold's National Provider Identifier (NPI) is 1427999176, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Hilary Arnold's specialty?

Hilary Arnold is listed in the NPPES registry with a primary specialty of Assistant Behavior Analyst (Behavioral Health & Social Service Providers).

Where is Hilary Arnold located?

Hilary Arnold's practice location on file with NPPES is 44480 20th St W, Lancaster, CA 93534-2714.

What is Hilary Arnold's phone number?

The practice phone number listed in the NPPES registry for Hilary Arnold is (714) 834-1111.

Is Hilary Arnold's NPI active?

Yes — Hilary Arnold's NPI (1427999176) is active in the NPPES registry as of the last update on 2026-04-04.

IndividualActive

Hilary Arnold

NPI 1427999176 · Assistant Behavior Analyst · Lancaster, CA

Hilary Arnold is a Assistant Behavior Analyst provider in Lancaster, CA (NPI 1427999176).

Provider details

NPI number: 1427999176
Entity type: Individual
Primary specialty: Assistant Behavior AnalystBehavioral Health & Social Service Providers
Sex: Female
Sole proprietor: No

Specialties & taxonomies

Assistant Behavior AnalystPrimary106E00000X
Behavioral Health & Social Service Providers

Profile Score

Basic profile(46/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
Under 1 yr in registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

44480 20th St W

Lancaster, CA 93534-2714

Phone: (714) 834-1111

Street-level locationGet directions

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Mailing address