Matthew Clark
NPI 1538930045 · Addiction (Substance Use Disorder) Counselor · Upland, CA
Matthew Clark is a Addiction (Substance Use Disorder) Counselor provider in Upland, CA (NPI 1538930045).
Provider details
- NPI number
- 1538930045
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- R1503700423 (CA)
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
2 yrs in NPPES 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
Mailing address
Registry dates
- Enumerated
- 2024-01-12
- Last updated
- 2024-05-30
- Certified
- 2024-05-30
Frequently asked questions
- What is Matthew Clark's NPI number?
- Matthew Clark's National Provider Identifier (NPI) is 1538930045, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Clark's specialty?
- Matthew Clark is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Matthew Clark located?
- Matthew Clark's practice location on file with NPPES is 239 W 9th St, Upland, CA 91786-5979.
- What is Matthew Clark's phone number?
- The practice phone number listed in the NPPES registry for Matthew Clark is (909) 340-4276.
- Is Matthew Clark's NPI active?
- Yes — Matthew Clark's NPI (1538930045) is active in the NPPES registry as of the last update on 2024-05-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.