Joseph Day, MFT
NPI 1659518330 · Marriage & Family Therapist · San Francisco, CA
Joseph Day, MFT is a Marriage & Family Therapist provider in San Francisco, CA (NPI 1659518330).
Provider details
- NPI number
- 1659518330
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- MFT
- Sex
- Male
- Sole proprietor
- No
- License
- 42844 (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
17 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
- 2009-01-16
- Last updated
- 2009-01-16
Frequently asked questions
- What is Joseph Day's NPI number?
- Joseph Day's National Provider Identifier (NPI) is 1659518330, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Day's specialty?
- Joseph Day is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Joseph Day located?
- Joseph Day's practice location on file with NPPES is 982 Mission St, San Francisco, CA 94103-2911.
- What is Joseph Day's phone number?
- The practice phone number listed in the NPPES registry for Joseph Day is (415) 271-8610.
- Is Joseph Day's NPI active?
- Yes — Joseph Day's NPI (1659518330) is active in the NPPES registry as of the last update on 2009-01-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.