NPPES file of Aug 9, 2026

Ruth Kosowitz, NURSE PRACTITIONER

Adult Health Nurse Practitioner · Oxnard, CA

Ruth Kosowitz, NURSE PRACTITIONER is an adult health nurse practitioner with a practice address in Oxnard, California, and NPI 1811272875, issued on Oct 20, 2011. Check the license (California G199605, 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 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1811272875
Name
Ruth Kosowitz
Credential
NURSE PRACTITIONER
Primary taxonomy
Adult Health Nurse Practitioner 363LA2200X
License number
G199605 CA
Self-reported in NPPES; status is on the state search
Practice location
3833 Sunset LN, Oxnard, CA 93035
Phone
(805) 402-5115
Enumerated
Oct 20, 2011
Record last updated
Oct 20, 2011 (not updated in 15 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest adult health nurse practitioner records → All 1,405 in California → Look up another NPI →

Verify Ruth Kosowitz 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 G199605    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

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98% fewer Medicare Part D claims than the average adult health nurse practitioner in 2024

29 Medicare Part D claims, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D.

  1. Ruth Kosowitz29
  2. Specialty average1,280

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.

Ruth Kosowitz among 1,405 adult health nurse practitioner records in California

Ruth Kosowitz, NURSE PRACTITIONER is one of 1,405 adult health nurse practitioner records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 41% of them.

  • NPI issued2011 · 41% of these records are older, 53% newer
  • In a Medicare fileYes · 56% of these records are
  • In the CMS Doctors and Clinicians fileNo · 31% of these records are
  • Record last updated2011 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Adult Health Nurse Practitioner providers in California

There are 1,405 adult health nurse practitioner records in California.

All 1,405 in California → Every provider in Oxnard → Adult Health Nurse Practitioner nationwide →

The 8 adult health nurse practitioner records with the nearest ZIP codes

  1. Margarita Fernandez, CRNPOxnard, CA 930351477677359
  2. Ruby Palomino Ayala, NPOxnard, CA 930351104713247
  3. Kathryn Barker, ANP-BCOxnard, CA 930361962641399
  4. Genevieve Davis, AGNP - BCOxnard, CA 930361700684214
  5. Savannah Harris, NPOxnard, CA 930301952944241
  6. Beverly Pluche, NURSE PRACTITIONEROxnard, CA 930301811342850
  7. Alicia Zaragoza, N.POxnard, CA 930301073925814
  8. Nicole Born, NPCamarillo, CA 930121154136760

Common questions

What is Ruth Kosowitz, NURSE PRACTITIONER's NPI number?

Ruth Kosowitz, NURSE PRACTITIONER's National Provider Identifier (NPI) is 1811272875, issued on Oct 20, 2011. An NPI identifies a provider in billing; it is not a license.

Where is Ruth Kosowitz, NURSE PRACTITIONER located?

The NPPES record lists a practice address at 3833 Sunset LN, Oxnard, CA, 93035. Phone: (805) 402-5115. Providers update this record themselves, so call before visiting.

How can I verify Ruth Kosowitz, NURSE PRACTITIONER's license?

NPPES lists California license number G199605, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Ruth Kosowitz, NURSE PRACTITIONER prescribe under Medicare Part D?

In 2024, Ruth Kosowitz, NURSE PRACTITIONER had 29 Medicare Part D claims; the average among adult health nurse practitioner prescribers was 1,280. 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.

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.