What is Arthur Koster's NPI number?

Arthur Koster's National Provider Identifier (NPI) is 1811886302, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Arthur Koster's specialty?

Arthur Koster is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).

Where is Arthur Koster located?

Arthur Koster's practice location on file with NPPES is 618 Indiana Ave Apt 3, Venice, CA 90291-3057.

What is Arthur Koster's phone number?

The practice phone number listed in the NPPES registry for Arthur Koster is (559) 392-3193.

Is Arthur Koster's NPI active?

Yes — Arthur Koster's NPI (1811886302) is active in the NPPES registry as of the last update on 2025-06-30.

IndividualActive

Arthur Koster

NPI 1811886302 · Marriage & Family Therapist · Venice, CA

Arthur Koster is a Marriage & Family Therapist provider in Venice, CA (NPI 1811886302).

Provider details

NPI number: 1811886302
Entity type: Individual
Primary specialty: Marriage & Family TherapistBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes
License: 155585 (CA)

Specialties & taxonomies

Marriage & Family TherapistPrimary106H00000XLicense 155585 (CA)
Behavioral Health & Social Service Providers

Profile Score

Established profile(54/100 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
100% 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

618 Indiana Ave Apt 3

Venice, CA 90291-3057

Phone: (559) 392-3193

Street-level locationGet directions

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Mailing address