Derek Hsieh, PH.D., L.C.S.W
NPI 1346323128 · Clinical Social Worker · Torrance, CA
Derek Hsieh, PH.D., L.C.S.W is a Clinical Social Worker provider in Torrance, CA (NPI 1346323128).
Provider details
- NPI number
- 1346323128
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- PH.D., L.C.S.W
- Sex
- Male
- Sole proprietor
- Yes
- License
- LCS21367 (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
- 2006-10-23
- Last updated
- 2007-07-08
Frequently asked questions
- What is Derek Hsieh's NPI number?
- Derek Hsieh's National Provider Identifier (NPI) is 1346323128, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Hsieh's specialty?
- Derek Hsieh is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Derek Hsieh located?
- Derek Hsieh's practice location on file with NPPES is 1000 W Carson St Bldg D2, Torrance, CA 90502-2004.
- What is Derek Hsieh's phone number?
- The practice phone number listed in the NPPES registry for Derek Hsieh is (310) 222-3129.
- Is Derek Hsieh's NPI active?
- Yes — Derek Hsieh's NPI (1346323128) 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.