NPPES file of Aug 9, 2026

Stephanie Mattern, LCSW

Clinical Social Worker · El Cajon, CA

Stephanie Mattern, LCSW is a clinical social worker with a practice address in El Cajon, California, and NPI 1598492613, issued on Aug 8, 2022. Check the license (California 123940, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1598492613
Name
Stephanie Mattern
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
License number
123940 CA
Self-reported in NPPES; status is on the state search
Practice location
1870 Cordell CT Ste 101, El Cajon, CA 92020
Phone
(619) 755-9961
Enumerated
Aug 8, 2022
Record last updated
Mar 14, 2025
Medicare enrollment
Enrolled (PECOS I20250326001693); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical social worker records → All 36,261 in California → Look up another NPI →

Also registered at 1870 Cordell CT Ste 101

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Rachelle Amini, PSY.D.., M.S.W.Family Psychologist1124139381
  2. Roberta DiazCounselor1396905899
  3. Michael FalconeMarriage & Family Therapist1578674768
  4. Lidia GarciaMarriage & Family Therapist1891170742
  5. Aura Gatewood, AMFTMarriage & Family Therapist1780237164
  6. Shannon Hoskins, LMFTMarriage & Family Therapist1497469449

Verify Stephanie Mattern in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 123940    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Sokyahealth Medical Group PCSan Diego, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Stephanie Mattern among 36,261 clinical social worker records in California

Stephanie Mattern, LCSW is one of 36,261 clinical social worker records with a practice address in California. 6% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 81% of them.

  • NPI issued2022 · 81% of these records are older, 14% newer
  • In a Medicare fileYes · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated2021 · median 2012 among the 4,008 with a school on file
  • Record last updated2025 · 45% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

120 clinical social worker records list a practice address in El Cajon

They are 120 of the 3,277 NPPES records with a practice address in El Cajon, and 36,261 clinical social worker records in California.

All 36,261 in California → Every provider in El Cajon → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Melissa Brash, LCSWEl Cajon, CA 920201043443765
  2. Judy Davis, LCSWEl Cajon, CA 920201376555797
  3. Maryjane Evans, ASWEl Cajon, CA 920201457482572
  4. Vickie Ficklin, LCSWEl Cajon, CA 920201851350466
  5. Janette GreenawaldEl Cajon, CA 920201528182755
  6. Shadi Haddad, ASWEl Cajon, CA 920201184878829
  7. Agnes Hajek, LCSWEl Cajon, CA 920201083815187
  8. Ruth Kleast, LCSWEl Cajon, CA 920201326272378

Common questions

What is Stephanie Mattern, LCSW's NPI number?

Stephanie Mattern, LCSW's National Provider Identifier (NPI) is 1598492613, issued on Aug 8, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Stephanie Mattern, LCSW located?

The NPPES record lists a practice address at 1870 Cordell CT Ste 101, El Cajon, CA, 92020. Phone: (619) 755-9961. Providers update this record themselves, so call before visiting.

How can I verify Stephanie Mattern, LCSW's license?

NPPES lists California license number 123940, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.