Matthew Kornswiet
Pediatrics Physician · Laguna Hills, CA
Matthew Kornswiet is a pediatrics physician with a practice address in Laguna Hills, California, and NPI 1336534338, issued on Apr 6, 2015. Check the license (California 20A17197, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew Kornswiet
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- 20A17197 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23521 Paseo DE Valencia Ste 200, Laguna Hills, CA 92653
- Phone
- (949) 951-5437
- Enumerated
- Apr 6, 2015
- Record last updated
- Jun 19, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 23521 Paseo DE Valencia Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brittany Morris, PA-CPhysician Assistant1841832383
Verify Matthew Kornswiet in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A17197Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $156.38
6 payments; by number, the most common kind was food and beverage; the largest payer was Sanofi-Aventis U.S. LLC. The 21,580 providers of this specialty with any payment received $842.05 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Matthew Kornswiet among 9,272 pediatrics physician records in California
Matthew Kornswiet is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 78% of them.
- NPI issued2015 · 78% of these records are older, 19% newer
- In a Medicare fileYes · 31% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2019 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatrics Physician providers in California
There are 9,272 pediatrics physician records in California.
All 9,272 in California → Every provider in Laguna Hills → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Jennifer Alcantar, MDLaguna Hills, CA 926531316524689
- Jonathan Auth, M.D.Laguna Hills, CA 926531871639823
- Celia Chiang, M.D.Laguna Hills, CA 926531639374176
- Matthew Coulson, M.D.Laguna Hills, CA 926531992899918
- Sarah Kay Herrera, M.D.Laguna Hills, CA 926531376800375
- Kristina Nylander, MDLaguna Hills, CA 926531386784338
- Dennis Phillips, MDLaguna Hills, CA 926531003956350
- Catherine Su, MDLaguna Hills, CA 926531407432438
Common questions
What is Matthew Kornswiet's NPI number?
Matthew Kornswiet's National Provider Identifier (NPI) is 1336534338, issued on Apr 6, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Kornswiet located?
The NPPES record lists a practice address at 23521 Paseo DE Valencia Ste 200, Laguna Hills, CA, 92653. Phone: (949) 951-5437. Providers update this record themselves, so call before visiting.
How can I verify Matthew Kornswiet's license?
NPPES lists California license number 20A17197, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.
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.