NPPES file of Aug 9, 2026

Patrick Diesfeld, M.D.

Obstetrics & Gynecology Physician · Ventura, CA

Patrick Diesfeld, M.D. is an obstetrics & gynecology physician with a practice address in Ventura, California, and NPI 1568576080, issued on Aug 19, 2006. Check the license (California G48770, as entered in NPPES) on the Medical Board of California; 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
1568576080
Name
Patrick Diesfeld
Credential
M.D.
Primary taxonomy
Obstetrics & Gynecology Physician 207V00000X
License number
G48770 CA
Self-reported in NPPES; status is on the state search
Practice location
168 N Brent St Ste 407, Ventura, CA 93003
Phone
(805) 648-2717
Enumerated
Aug 19, 2006
Record last updated
Oct 30, 2025
Fax
(805) 648-2023
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 obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →

Verify Patrick Diesfeld in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G48770    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
Open the California license search

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17% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024

193 Medicare Part D claims for 45 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.

  1. Patrick Diesfeld193
  2. Specialty average165

Most prescribed

  1. Estradiol66 claims
  2. Progesterone23 claims
  3. Estradiol-Norethindrone Acetat21 claims
  4. Yuvafem16 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.

Patrick Diesfeld among 5,088 obstetrics & gynecology physician records in California

Patrick Diesfeld, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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 5% of them.

  • NPI issued2006 · 5% of these records are older, 52% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileNo · 53% of these records are
  • Record last updated2025 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Obstetrics & Gynecology Physician providers in California

There are 5,088 obstetrics & gynecology physician records in California.

All 5,088 in California → Every provider in Ventura → Obstetrics & Gynecology Physician nationwide →

The 8 obstetrics & gynecology physician records with the nearest ZIP codes

  1. Lois Barnes, M.D.Ventura, CA 930031134233521
  2. Terry Cole, M.D.Ventura, CA 930031992748651
  3. Steven Coyle, MDVentura, CA 930031548276900
  4. Katherine Edwards, M.D.Ventura, CA 930031972635498
  5. Olivia Farfan-Gonzalez, M.D.Ventura, CA 930031720014376
  6. John Gustafson, M.D.Ventura, CA 930031003836016
  7. Jeffrey Martin, M.D.Ventura, CA 930031568490803
  8. Srisawai Pattamakom, M.D.Ventura, CA 930031114031648

Common questions

What is Patrick Diesfeld, M.D.'s NPI number?

Patrick Diesfeld, M.D.'s National Provider Identifier (NPI) is 1568576080, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Patrick Diesfeld, M.D. located?

The NPPES record lists a practice address at 168 N Brent St Ste 407, Ventura, CA, 93003. Phone: (805) 648-2717. Providers update this record themselves, so call before visiting.

How can I verify Patrick Diesfeld, M.D.'s license?

NPPES lists California license number G48770, 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 Patrick Diesfeld, M.D. prescribe under Medicare Part D?

In 2024, Patrick Diesfeld, M.D. had 193 Medicare Part D claims for 45 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.