John Barker
NPI 1043800857 · Addiction (Substance Use Disorder) Counselor · Riverside, CA
John Barker is a Addiction (Substance Use Disorder) Counselor provider in Riverside, CA (NPI 1043800857).
Provider details
- NPI number
- 1043800857
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- 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
5 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
- 2021-01-25
- Last updated
- 2021-01-25
- Certified
- 2021-01-25
Frequently asked questions
- What is John Barker's NPI number?
- John Barker's National Provider Identifier (NPI) is 1043800857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Barker's specialty?
- John Barker is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is John Barker located?
- John Barker's practice location on file with NPPES is 5870 Arlington Ave, Riverside, CA 92504-2037.
- What is John Barker's phone number?
- The practice phone number listed in the NPPES registry for John Barker is (951) 683-6596.
- Is John Barker's NPI active?
- Yes — John Barker's NPI (1043800857) is active in the NPPES registry as of the last update on 2021-01-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.