What is Marquis Williams's NPI number?

Marquis Williams's National Provider Identifier (NPI) is 1558242313, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Marquis Williams's specialty?

Marquis Williams is listed in the NPPES registry with a primary specialty of Counselor (Behavioral Health & Social Service Providers).

Where is Marquis Williams located?

Marquis Williams's practice location on file with NPPES is 391 Ellis St, San Francisco, CA 94102-2709.

What is Marquis Williams's phone number?

The practice phone number listed in the NPPES registry for Marquis Williams is (415) 632-0267.

Is Marquis Williams's NPI active?

Yes — Marquis Williams's NPI (1558242313) is active in the NPPES registry as of the last update on 2025-09-09.

IndividualActive

Marquis Williams

NPI 1558242313 · Counselor · San Francisco, CA

Marquis Williams is a Counselor provider in San Francisco, CA (NPI 1558242313).

Provider details

NPI number: 1558242313
Entity type: Individual
Primary specialty: CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes
License: SUDRICI-22437 (CA)

Specialties & taxonomies

CounselorPrimary101Y00000XLicense SUDRICI-22437 (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

391 Ellis St

San Francisco, CA 94102-2709

Phone: (415) 632-0267

Approximate (ZIP-level) locationGet directions

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Mailing address