William Jefferson, M.A.
NPI 1659419455 · Marriage & Family Therapist · Gilbert, AZ
William Jefferson, M.A. is a Marriage & Family Therapist provider in Gilbert, AZ (NPI 1659419455).
Provider details
- NPI number
- 1659419455
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- M.A.
- Sex
- Male
- Sole proprietor
- Yes
- License
- LPC 0229 (AZ)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
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
- 2007-02-02
- Last updated
- 2025-09-11
Frequently asked questions
- What is William Jefferson's NPI number?
- William Jefferson's National Provider Identifier (NPI) is 1659419455, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Jefferson's specialty?
- William Jefferson is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is William Jefferson located?
- William Jefferson's practice location on file with NPPES is 1150 N Sailors Way, Gilbert, AZ 85234-3612.
- What is William Jefferson's phone number?
- The practice phone number listed in the NPPES registry for William Jefferson is (480) 632-0276.
- Is William Jefferson's NPI active?
- Yes — William Jefferson's NPI (1659419455) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.