Jeffrey K. Feinfield, M.D.
Specialist · Thousand Oaks, CA
Jeffrey K. Feinfield, M.D. is a specialist with a practice address in Thousand Oaks, California, and NPI 1740372028, issued on Sep 28, 2006. Check the license (California A71991, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Jeffrey K. Feinfield
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A71991 CA
Self-reported in NPPES; status is on the state search - Practice location
- 555 Marin St, Thousand Oaks, CA 91360
- Phone
- (805) 494-4797
- Enumerated
- Sep 28, 2006
- Record last updated
- Apr 27, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (805) 494-4810
- Medicare enrollment
- Enrolled (PECOS I20070808000251); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1998
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 555 Marin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Keronne Alexis, DNP,MSN,APRN,FNP-BCNurse Practitioner1205557006
- Stephen Benson, DPMFoot & Ankle Surgery Podiatrist1508885278
- Silvina Cox, R.D.Nutrition Education Nutritionist1508276155
- Andres Giron, M.D.Pulmonary Disease Physician1922027630
- Jonathan Lee, D.D.S.Endodontics1669670113
- Carolann O'Rourke, AUDAudiologist1447967740
Verify Jeffrey K. Feinfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A71991Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average specialist in 2024
574 Medicare Part D claims for 198 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 23 claims were for opioids.
Most prescribed
- Pantoprazole Sodium140 claims
- Ipratropium Bromide121 claims
- Methylprednisolone43 claims
- Cefdinir40 claims
- Tobramycin-Dexamethasone30 claims
- Hydrocodone-Acetaminophen23 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): 93.7 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: $9,410.72
48 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. The 5,844 providers of this specialty with any payment received $4,760.79 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 one group practice
- Jeffrey Feinfield, M.D. IncThousand Oaks, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey K. Feinfield among 5,749 specialist records in California
Jeffrey K. Feinfield, M.D. is one of 5,749 specialist records with a practice address in California. 30% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1998 · median 1989 among the 1,075 with a school on file
- Record last updated2017 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 specialist records list a practice address in Thousand Oaks
They are 25 of the 2,434 NPPES records with a practice address in Thousand Oaks, and 5,749 specialist records in California.
All 5,749 in California → Every provider in Thousand Oaks → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Miriam De Lyon, M.D.Thousand Oaks, CA 913601952430431
- Alister George, M.D.Thousand Oaks, CA 913601821280629
- Michael Gollub, M.D.Thousand Oaks, CA 913601881723351
- Vrej GrigorianThousand Oaks, CA 913601972708840
- Anne HannickThousand Oaks, CA 913601851073563
- Melissa Johns, PTThousand Oaks, CA 913601881606317
- Jesse LeeThousand Oaks, CA 913601780248062
- John Millington, MDThousand Oaks, CA 913601740346931
Common questions
What is Jeffrey K. Feinfield, M.D.'s NPI number?
Jeffrey K. Feinfield, M.D.'s National Provider Identifier (NPI) is 1740372028, issued on Sep 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey K. Feinfield, M.D. located?
The NPPES record lists a practice address at 555 Marin St, Thousand Oaks, CA, 91360. Phone: (805) 494-4797. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey K. Feinfield, M.D.'s license?
NPPES lists California license number A71991, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Jeffrey K. Feinfield, M.D. prescribe under Medicare Part D?
In 2024, Jeffrey K. Feinfield, M.D. had 574 Medicare Part D claims for 198 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Jeffrey K. Feinfield, M.D.'s MIPS final score?
The 2023 MIPS final score is 93.7 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.