What is Sean Lewallyn's NPI number?

Sean Lewallyn's National Provider Identifier (NPI) is 1861220691, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Sean Lewallyn's specialty?

Sean Lewallyn is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).

Where is Sean Lewallyn located?

Sean Lewallyn's practice location on file with NPPES is 8836 S Vermont Ave, Los Angeles, CA 90044-4832.

What is Sean Lewallyn's phone number?

The practice phone number listed in the NPPES registry for Sean Lewallyn is (323) 593-5300.

Is Sean Lewallyn's NPI active?

Yes — Sean Lewallyn's NPI (1861220691) is active in the NPPES registry as of the last update on 2025-09-12.

IndividualActive

Sean Lewallyn

NPI 1861220691 · Clinical Social Worker · Los Angeles, CA

Sean Lewallyn is a Clinical Social Worker provider in Los Angeles, CA (NPI 1861220691).

Provider details

NPI number: 1861220691
Entity type: Individual
Primary specialty: Clinical Social WorkerBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes

Specialties & taxonomies

Clinical Social WorkerPrimary1041C0700X
Behavioral Health & Social Service Providers

Profile Score

Established profile(50/100 index)

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

Registry tenure38% of score
1 yr in NPPES 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

8836 S Vermont Ave

Los Angeles, CA 90044-4832

Phone: (323) 593-5300

Street-level locationGet directions

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Mailing address