What is Marcus Guillen's NPI number?

Marcus Guillen's National Provider Identifier (NPI) is 1558241042, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Marcus Guillen's specialty?

Marcus Guillen is listed in the NPPES registry with a primary specialty of Behavior Technician (Behavioral Health & Social Service Providers).

Where is Marcus Guillen located?

Marcus Guillen's practice location on file with NPPES is 713 W Commonwealth Ave Ste C, Fullerton, CA 92832-1612.

What is Marcus Guillen's phone number?

The practice phone number listed in the NPPES registry for Marcus Guillen is (714) 879-4274.

Is Marcus Guillen's NPI active?

Yes — Marcus Guillen's NPI (1558241042) is active in the NPPES registry as of the last update on 2025-09-04.

IndividualActive

Marcus Guillen

NPI 1558241042 · Behavior Technician · Fullerton, CA

Marcus Guillen is a Behavior Technician provider in Fullerton, CA (NPI 1558241042).

Provider details

NPI number: 1558241042
Entity type: Individual
Primary specialty: Behavior TechnicianBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Behavior TechnicianPrimary106S00000X
Behavioral Health & Social Service Providers

Profile Score

Basic profile(47/100 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

713 W Commonwealth Ave Ste C

Suite C

Fullerton, CA 92832-1612

Phone: (714) 879-4274

Street-level locationGet directions

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Mailing address