Marlon Welch, RAS
NPI 1336359413 · Addiction (Substance Use Disorder) Counselor · San Francisco, CA
Marlon Welch, RAS is a Addiction (Substance Use Disorder) Counselor provider in San Francisco, CA (NPI 1336359413).
Provider details
- NPI number
- 1336359413
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- RAS
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs 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
Mailing address
Registry dates
- Enumerated
- 2007-05-23
- Last updated
- 2007-09-12
Frequently asked questions
- What is Marlon Welch's NPI number?
- Marlon Welch's National Provider Identifier (NPI) is 1336359413, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marlon Welch's specialty?
- Marlon Welch is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Marlon Welch located?
- Marlon Welch's practice location on file with NPPES is 433 Turk St, San Francisco, CA 94102-3329.
- What is Marlon Welch's phone number?
- The practice phone number listed in the NPPES registry for Marlon Welch is (415) 928-7802.
- Is Marlon Welch's NPI active?
- Yes — Marlon Welch's NPI (1336359413) is active in the NPPES registry as of the last update on 2007-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.