NPPES file of Aug 9, 2026

Ronald Jay Friedman, M.D.

Specialist · Westlake Village, CA

Ronald Jay Friedman, M.D. is a specialist with a practice address in Westlake Village, California, and NPI 1811069982, issued on Nov 14, 2006. Check the license (California G17191, 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
1811069982
Name
Ronald Jay Friedman
Credential
M.D.
Primary taxonomy
Specialist 174400000X
License number
G17191 CA
Self-reported in NPPES; status is on the state search
Practice location
5706 Corsa Ave, Westlake Village, CA 91362
Phone
(800) 400-4674
Enumerated
Nov 14, 2006
Record last updated
Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(818) 251-1112
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 specialist records → All 5,749 in California → Look up another NPI →

Verify Ronald Jay Friedman 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 G17191    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 specialist in 2024

31 Medicare Part D claims, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D.

  1. Ronald Friedman31
  2. Specialty average1,380

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.

Ronald Jay Friedman among 5,749 specialist records in California

Ronald Jay Friedman, 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 fileNo · 19% of these records are
  • Record last updated2007 · 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).

17 specialist records list a practice address in Westlake Village

They are 17 of the 1,397 NPPES records with a practice address in Westlake Village, and 5,749 specialist records in California.

All 5,749 in California → Every provider in Westlake Village → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. Robert Benson, M.D.Westlake, CA 913621033188529
  2. Aref Bhuiya, MDWestlake Village, CA 913621932369675
  3. Ronald Brooks, RPTThousand Oaks, CA 913621891919114
  4. Lisa Davis, HP, LMTWestlake Village, CA 913621922385186
  5. Lindsey EthridgeThousand Oaks, CA 913621952721631
  6. Robert GarrettThousand Oaks, CA 913621669566790
  7. Stacy Lehman, C.M.TWestlake Village, CA 913621144241266
  8. Christine Rasmussen, MTWestlake Village, CA 913621285074864

Common questions

What is Ronald Jay Friedman, M.D.'s NPI number?

Ronald Jay Friedman, M.D.'s National Provider Identifier (NPI) is 1811069982, issued on Nov 14, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Ronald Jay Friedman, M.D. located?

The NPPES record lists a practice address at 5706 Corsa Ave, Westlake Village, CA, 91362. Phone: (800) 400-4674. Providers update this record themselves, so call before visiting.

How can I verify Ronald Jay Friedman, M.D.'s license?

NPPES lists California license number G17191, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Ronald Jay Friedman, M.D. prescribe under Medicare Part D?

In 2024, Ronald Jay Friedman, M.D. had 31 Medicare Part D claims; the average among specialist prescribers was 1,380. 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.