Katya Isabel De Souza
Emergency Medicine Physician · Fremont, CA
Katya Isabel De Souza is an emergency medicine physician with a practice address in Fremont, California, and NPI 1417452228, issued on Mar 26, 2018. Check the license (California 176050, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katya Isabel De Souza
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 176050 CA
Self-reported in NPPES; status is on the state search - Practice location
- 39400 Paseo Padre Pkwy, Fremont, CA 94538
- Phone
- (510) 248-3000
- Enumerated
- Mar 26, 2018
- Record last updated
- Aug 23, 2022
- Medicare enrollment
- Enrolled (PECOS I20220926001662); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 39400 Paseo Padre Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Denise Agatep, LCSWCounselor1164584900
- Ujwala Agharkar, MDChild & Adolescent Psychiatry Physician1073685723
- Dolly Ahluwalia, RDRegistered Dietitian1659429157
- Tabassum Alam, MDHospitalist Physician1306921069
- Mary Alyono, MDAnesthesiology Physician1477631059
- Stephanie Aoki, PHDPsychologist1427721216
Verify Katya Isabel De Souza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 176050Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% fewer Medicare Part D claims than the average emergency medicine physician in 2024
150 Medicare Part D claims for 112 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Cefadroxil16 claims
- Oxycodone Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncFremont, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katya Isabel De Souza among 7,751 emergency medicine physician records in California
Katya Isabel De Souza is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 81% of them.
- NPI issued2018 · 81% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2018 · median 2011 among the 4,560 with a school on file
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Fremont → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Naveenpal Bhatti, MDFremont, CA 945381700961463
- William Busby, MDFremont, CA 945381407986649
- Leif Canfield, MDFremont, CA 945381891873386
- Betty Chu, MDFremont, CA 945381578641015
- Neal Dickler, MDFremont, CA 945381902936149
- Kadeer Halimi, D.O.Fremont, CA 945381912995952
- Adele Hultin, MDFremont, CA 945381144305814
- Sun Lin, MDFremont, CA 945381215098298
Common questions
What is Katya Isabel De Souza's NPI number?
Katya Isabel De Souza's National Provider Identifier (NPI) is 1417452228, issued on Mar 26, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Katya Isabel De Souza located?
The NPPES record lists a practice address at 39400 Paseo Padre Pkwy, Fremont, CA, 94538. Phone: (510) 248-3000. Providers update this record themselves, so call before visiting.
How can I verify Katya Isabel De Souza's license?
NPPES lists California license number 176050, 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.
How much does Katya Isabel De Souza prescribe under Medicare Part D?
In 2024, Katya Isabel De Souza had 150 Medicare Part D claims for 112 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions 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.
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.