PATRICK W DIESFELD MD A PROFESSIONAL CORPORATION
NPI 1598525909
Obstetrics & Gynecology in Ventura, CA

Q: What is Patrick W Diesfeld MD A Professional Corporation's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Active since March 21, 2024CLIA 05D0936879 · Microscopy

168 N BRENT ST STE 407, VENTURA, CA 93003(805) 648-2717(805) 648-2023 Get Directions Write a Review

NPPES record last updated: September 2, 2025. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Sep 2, 2025, Jul 2, 2024 (2 updates tracked since 2024).

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About Patrick W Diesfeld Md A Professional Corporation NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

PATRICK W DIESFELD MD A PROFESSIONAL CORPORATION (NPI 1598525909), doing business as Women's Health Group Of Ventura, is a healthcare organization registered as an obstetrics & gynecology in Ventura, California and active in the NPI registry since March 2024. The organization holds a CLIA Microscopy certificate valid through May 15, 2027 and lists Patrick Diesfeld, Doctor, as its authorized official.

NPPES Registry Identity

NPI1598525909

Entity TypeOrganization

Primary Taxonomy207V00000X

Legal Business NamePATRICK W DIESFELD MD A PROFESSIONAL CORPORATION

Location Address168 N BRENT ST STE 407Ventura, CA 93003-2824

Mailing Address168 N Brent St Ste 407Ventura, CA 93003-2824 · (805) 648-7127 · Fax (805) 648-2023

Phone(805) 648-2717

Fax(805) 648-2023

Organization SubpartNo

Authorized OfficialPatrick DiesfeldDoctor · (805) 648-2717

Enumeration DateMarch 21, 2024

Last NPPES UpdateSeptember 2, 20252 updates tracked since enumeration

NPPES CertifiedJuly 2, 2024

✔ NPI 1598525909 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

168 N BRENT ST STE 407, Ventura, CA 93003

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Other Names 1

Doing Business AsWomen's Health Group Of Ventura

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 05D0936879

Patrick Diesfeld, MD · Ventura, CA

Active · expires May 15, 2027

CLIA Number05D0936879

Laboratory TypePhysician Office

Certificate Effective DateMay 16, 2025

Certificate Expiration DateMay 15, 2027

Laboratory DirectorPatrick W. Diesfeld

Laboratory Phone(805) 648-2717

Laboratory LocationPatrick Diesfeld, MD168 N Brent St, #407, Ventura, CA 93003

CLIA data matches this NPI record on: Phone

This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. PATRICK DIESFELD M.D.

Obstetrics & Gynecology

168 N BRENT ST STE 407
VENTURA, CA 93003

Ventura County (805) 648-2717

DIESFELD & PATTAMAKOM OBSTETRICS AND GYNECOLOGY MEDICAL GROUP

Obstetrics & Gynecology

168 N BRENT ST STE 407
VENTURA, CA 93003

Ventura County (805) 648-2717

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Patrick W Diesfeld MD A Professional Corporation's NPI number?

The NPI number for Patrick W Diesfeld MD A Professional Corporation is 1598525909. It was assigned to this organization in the NPPES registry on March 21, 2024. The provider is doing business as Women's Health Group of Ventura.

Where is Patrick W Diesfeld MD A Professional Corporation located?

Patrick W Diesfeld MD A Professional Corporation is located at 168 N Brent St Ste 407, Ventura, CA 93003. The listed phone number is (805) 648-2717.

What is Patrick W Diesfeld MD A Professional Corporation's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Does Patrick W Diesfeld MD A Professional Corporation hold a CLIA laboratory certificate?

Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 05D0936879) is associated with this NPI, valid through May 15, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Patrick W Diesfeld MD A Professional Corporation was last updated on September 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.