What is Karl Maciejewski's NPI number?

Karl Maciejewski's National Provider Identifier (NPI) is 1689514242, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Karl Maciejewski's specialty?

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

Where is Karl Maciejewski located?

Karl Maciejewski's practice location on file with NPPES is 1333 S Mayflower Ave, Monrovia, CA 91016-4066.

What is Karl Maciejewski's phone number?

The practice phone number listed in the NPPES registry for Karl Maciejewski is (818) 241-6780.

Is Karl Maciejewski's NPI active?

Yes — Karl Maciejewski's NPI (1689514242) is active in the NPPES registry as of the last update on 2026-03-31.

IndividualActive

Karl Maciejewski

NPI 1689514242 · Behavior Technician · Monrovia, CA

Karl Maciejewski is a Behavior Technician provider in Monrovia, CA (NPI 1689514242).

Provider details

NPI number: 1689514242
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(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

1333 S Mayflower Ave

Suite 220

Monrovia, CA 91016-4066

Phone: (818) 241-6780

Fax: (888) 588-2752

Street-level locationGet directions

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Mailing address