Claudia Sieber, MFT
NPI 1376665638 · Marriage & Family Therapist · Oakland, CA
Claudia Sieber, MFT is a Marriage & Family Therapist provider in Oakland, CA (NPI 1376665638).
Provider details
- NPI number
- 1376665638
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- MFT
- Sex
- Female
- Sole proprietor
- Yes
- License
- MFC44012 (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
- 2007-04-05
- Last updated
- 2007-07-08
Frequently asked questions
- What is Claudia Sieber's NPI number?
- Claudia Sieber's National Provider Identifier (NPI) is 1376665638, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claudia Sieber's specialty?
- Claudia Sieber is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Claudia Sieber located?
- Claudia Sieber's practice location on file with NPPES is 3637 Grand Ave, Oakland, CA 94610-2029.
- What is Claudia Sieber's phone number?
- The practice phone number listed in the NPPES registry for Claudia Sieber is (510) 238-0741.
- Is Claudia Sieber's NPI active?
- Yes — Claudia Sieber's NPI (1376665638) 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.