John Bolf, PHD
NPI 1558489138 · Marriage & Family Therapist · Roseville, CA
John Bolf, PHD is a Marriage & Family Therapist provider in Roseville, CA (NPI 1558489138).
Provider details
- NPI number
- 1558489138
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY6653 (CA)
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
- 2007-03-26
- Last updated
- 2025-09-11
Frequently asked questions
- What is John Bolf's NPI number?
- John Bolf's National Provider Identifier (NPI) is 1558489138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Bolf's specialty?
- John Bolf is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is John Bolf located?
- John Bolf's practice location on file with NPPES is 101 Cirby Hills Dr, Roseville, CA 95678-4360.
- What is John Bolf's phone number?
- The practice phone number listed in the NPPES registry for John Bolf is (916) 787-8814.
- Is John Bolf's NPI active?
- Yes — John Bolf's NPI (1558489138) 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.