William Mullen, LMFT
NPI 1205998275 · Marriage & Family Therapist · Vacaville, CA
William Mullen, LMFT is a Marriage & Family Therapist provider in Vacaville, CA (NPI 1205998275).
Provider details
- NPI number
- 1205998275
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- LMFT
- Sex
- Male
- Sole proprietor
- Yes
- License
- MFC32884 (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
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
- 2006-12-15
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Mullen's NPI number?
- William Mullen's National Provider Identifier (NPI) is 1205998275, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mullen's specialty?
- William Mullen is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is William Mullen located?
- William Mullen's practice location on file with NPPES is 3700 Vaca Valley Pkwy, Vacaville, CA 95688-9430.
- What is William Mullen's phone number?
- The practice phone number listed in the NPPES registry for William Mullen is (707) 453-5334.
- Is William Mullen's NPI active?
- Yes — William Mullen's NPI (1205998275) 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.