Joseph Bielefeld, PMHNP-BC/FNP
NPI 1124639943 · Psychiatric/Mental Health Nurse Practitioner · Fairfield, CA
Joseph Bielefeld, PMHNP-BC/FNP is a Psychiatric/Mental Health Nurse Practitioner provider in Fairfield, CA (NPI 1124639943).
Provider details
- NPI number
- 1124639943
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PMHNP-BC/FNP
- Sex
- Male
- Sole proprietor
- Yes
- License
- NONE (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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
Additional practice locations (2)
- 2310 1st StNapa, CA 94559-2239Phone: (707) 224-8266
- 2300 Northpoint PkwySanta Rosa, CA 95407-5004Phone: (707) 224-8266
Registry dates
- Enumerated
- 2020-08-14
- Last updated
- 2025-05-20
- Certified
- 2025-05-20
Frequently asked questions
- What is Joseph Bielefeld's NPI number?
- Joseph Bielefeld's National Provider Identifier (NPI) is 1124639943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Bielefeld's specialty?
- Joseph Bielefeld is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Joseph Bielefeld located?
- Joseph Bielefeld's practice location on file with NPPES is 4820 Business Center Dr, Fairfield, CA 94534-1696.
- What is Joseph Bielefeld's phone number?
- The practice phone number listed in the NPPES registry for Joseph Bielefeld is (707) 224-8266.
- Is Joseph Bielefeld's NPI active?
- Yes — Joseph Bielefeld's NPI (1124639943) is active in the NPPES registry as of the last update on 2025-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.