Cliff Mills
NPI 1629273891 · Addiction (Substance Use Disorder) Counselor · Clayton, CA
Cliff Mills is a Addiction (Substance Use Disorder) Counselor provider in Clayton, CA (NPI 1629273891).
Provider details
- NPI number
- 1629273891
- 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
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
- 2007-06-18
- Last updated
- 2007-07-08
Frequently asked questions
- What is Cliff Mills's NPI number?
- Cliff Mills's National Provider Identifier (NPI) is 1629273891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cliff Mills's specialty?
- Cliff Mills is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Cliff Mills located?
- Cliff Mills's practice location on file with NPPES is 11540 Marsh Creek Rd, Clayton, CA 94517-9759.
- What is Cliff Mills's phone number?
- The practice phone number listed in the NPPES registry for Cliff Mills is (925) 672-5700.
- Is Cliff Mills's NPI active?
- Yes — Cliff Mills's NPI (1629273891) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.