Stephan Diehl
NPI 1144921370 · Addiction (Substance Use Disorder) Counselor · San Diego, CA
Stephan Diehl is a Addiction (Substance Use Disorder) Counselor provider in San Diego, CA (NPI 1144921370).
Provider details
- NPI number
- 1144921370
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
- License
- R1475590722 (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
3 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
- 2023-03-14
- Last updated
- 2023-03-14
- Certified
- 2023-03-14
Frequently asked questions
- What is Stephan Diehl's NPI number?
- Stephan Diehl's National Provider Identifier (NPI) is 1144921370, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephan Diehl's specialty?
- Stephan Diehl is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Stephan Diehl located?
- Stephan Diehl's practice location on file with NPPES is 4161 Marlborough Ave, San Diego, CA 92105-1412.
- What is Stephan Diehl's phone number?
- The practice phone number listed in the NPPES registry for Stephan Diehl is (619) 282-7274.
- Is Stephan Diehl's NPI active?
- Yes — Stephan Diehl's NPI (1144921370) is active in the NPPES registry as of the last update on 2023-03-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.