James Nirenstein, PH.D. M.F.T.
NPI 1699794156 · Marriage & Family Therapist · Walnut Creek, CA
James Nirenstein, PH.D. M.F.T. is a Marriage & Family Therapist provider in Walnut Creek, CA (NPI 1699794156).
Provider details
- NPI number
- 1699794156
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- PH.D. M.F.T.
- Sex
- Male
- Sole proprietor
- Yes
- License
- M12843 (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
- 2006-07-18
- Last updated
- 2007-07-08
Frequently asked questions
- What is James Nirenstein's NPI number?
- James Nirenstein's National Provider Identifier (NPI) is 1699794156, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Nirenstein's specialty?
- James Nirenstein is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is James Nirenstein located?
- James Nirenstein's practice location on file with NPPES is 45 Quail Ct Ste 200, Walnut Creek, CA 94596-8729.
- What is James Nirenstein's phone number?
- The practice phone number listed in the NPPES registry for James Nirenstein is (925) 934-6943.
- Is James Nirenstein's NPI active?
- Yes — James Nirenstein's NPI (1699794156) 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.