Jay Paul Klarnet, MD
Medical Oncology Physician · Oxnard, CA
Jay Paul Klarnet, MD is a medical oncology physician with a practice address in Oxnard, California, and NPI 1538258314, issued on Oct 12, 2006. Check the license (California G88453, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jay Paul Klarnet
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License numbers
- G88453 CA
Z185726 AZ
MD00021124 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1700 N Rose Ave Ste 470, Oxnard, CA 93030
- Phone
- (805) 988-7080
- Enumerated
- Oct 12, 2006
- Record last updated
- Mar 4, 2026
- Fax
- (805) 988-7081
- Medicaid ID
- 1081843 WA
- Medicare enrollment
- Enrolled (PECOS I20131114000776); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Buffalo School Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 1700 N Rose Ave Ste 470
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachel Araujo, NPNurse Practitioner1508632316
- Amit Goyal, M.D.Neurological Surgery Physician1174813588
- Bradley Hiner, MDNeurology Physician1326099151
- Brittni Mack, PA-CSurgical Physician Assistant1063975753
- Brian MiremadiNeurology Physician1376078931
- Mani Nezhad, M.D.Neurology Physician1669716387
Verify Jay Paul Klarnet in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G88453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% more Medicare Part D claims than the average medical oncology physician in 2024
934 Medicare Part D claims for 218 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 38 claims were for opioids.
Most prescribed
- Prednisone110 claims
- Anastrozole99 claims
- Eliquis45 claims
- Letrozole42 claims
- Dexamethasone41 claims
- Potassium Chloride34 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.
The MIPS final score for 2023 (Medicare payment program): 0 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,264.47
59 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 3,343 providers of this specialty with any payment received $11,773.47 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.
Bills Medicare through 2 group practices
- Alaska Native Tribal Health ConsortiumAnchorage, AK
- Hrmc, LLCLake Havasu City, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jay Paul Klarnet among 447 medical oncology physician records in California
Jay Paul Klarnet, MD is one of 447 medical oncology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1980 · median 2004 among the 312 with a school on file
- Record last updated2026 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in Oxnard → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Robert Ouwendijk, M.D.Ventura, CA 930031578627725
- Evan Slater, M.D.Ventura, CA 930031992869044
- Melissa Cohen, M.D.Simi Valley, CA 930651174763262
- Daniel Greenwald, M.D.Santa Barbara, CA 931051235240987
- Mukul Gupta, M.D.Santa Barbara, CA 931051295843738
- Juliet Penn, M.D.Santa Barbara, CA 931051215175070
- Farshid Dayyani, M.D., PH.D.Orange, CA 928681376710434
- Samuel Ejadi, MDOrange, CA 928681285605212
Common questions
What is Jay Paul Klarnet, MD's NPI number?
Jay Paul Klarnet, MD's National Provider Identifier (NPI) is 1538258314, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jay Paul Klarnet, MD located?
The NPPES record lists a practice address at 1700 N Rose Ave Ste 470, Oxnard, CA, 93030. Phone: (805) 988-7080. Providers update this record themselves, so call before visiting.
How can I verify Jay Paul Klarnet, MD's license?
NPPES lists California license number G88453, 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 Jay Paul Klarnet, MD prescribe under Medicare Part D?
In 2024, Jay Paul Klarnet, MD had 934 Medicare Part D claims for 218 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is Jay Paul Klarnet, MD's MIPS final score?
The 2023 MIPS final score is 0 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.