Karla Islas-Kostszewa
NPI 1346750650 · Clinical Social Worker · Garden Grove, CA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karla Islas-Kostszewa is a Clinical Social Worker provider in Garden Grove, CA (NPI 1346750650).
Provider details
- NPI number
- 1346750650
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
- License
- ASW77339 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
- Mental Health Counselor101YM0800X
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
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 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 (1)
- Po Box 845Los Alamitos, CA 90720-0845Phone: (949) 385-0092
Registry dates
- Enumerated
- 2017-10-02
- Last updated
- 2026-05-18
- Certified
- 2026-05-18
Frequently asked questions
- What is Karla Islas-Kostszewa's NPI number?
- Karla Islas-Kostszewa's National Provider Identifier (NPI) is 1346750650, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karla Islas-Kostszewa's specialty?
- Karla Islas-Kostszewa is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Karla Islas-Kostszewa located?
- Karla Islas-Kostszewa's practice location on file with NPPES is 10331 Stanford Ave, Garden Grove, CA 92840-6351.
- What is Karla Islas-Kostszewa's phone number?
- The practice phone number listed in the NPPES registry for Karla Islas-Kostszewa is (714) 663-6000.
- Does Karla Islas-Kostszewa accept Medicare?
- Karla Islas-Kostszewa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karla Islas-Kostszewa's NPI active?
- Yes — Karla Islas-Kostszewa's NPI (1346750650) is active in the NPPES registry as of the last update on 2026-05-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.