JOHN Y HESS MD A MEDICAL CORPORATION
NPI 1780796151
Internal Medicine - Cardiovascular Disease in Thousand Oaks, CA

Q: What is John Y Hess MD A Medical Corporation's NPI number?

The NPI number for John Y Hess MD A Medical Corporation is 1780796151. It was assigned to this organization in the NPPES registry on August 31, 2006. The provider was formerly known as John Y. Hess, M.D., A Medical Corporation.

Q: What is John Y Hess MD A Medical Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Active since August 31, 2006

2220 LYNN RD, SUITE 203, THOUSAND OAKS, CA 91360(805) 494-9494(805) 374-9994 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 11, 2025, Sep 11, 2017 (2 updates tracked since 2017).

On this page

About John Y Hess Md A Medical Corporation NPPES

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

JOHN Y HESS MD A MEDICAL CORPORATION (NPI 1780796151), doing business as John Y. Hess, M.d., A Medical Corporation, is a healthcare organization registered as a cardiovascular disease in Thousand Oaks, California and active in the NPI registry since August 2006. The organization lists Debra L. Williams, Business Manager, as its authorized official.

NPPES Registry Identity

NPI1780796151

Entity TypeOrganization

Primary Taxonomy207RC0000X

Legal Business NameJOHN Y HESS MD A MEDICAL CORPORATION

Location Address2220 LYNN RD, SUITE 203Thousand Oaks, CA 91360-1904

Mailing Address2220 Lynn Rd, Suite 201Thousand Oaks, CA 91360-1904 · (805) 494-9494 · Fax (805) 374-9994

Phone(805) 494-9494

Fax(805) 374-9994

Organization SubpartNo

Authorized OfficialDebra L. WilliamsBusiness Manager · (805) 494-9494

Enumeration DateAugust 31, 2006

Last NPPES UpdateSeptember 11, 20252 updates tracked since enumeration

✔ NPI 1780796151 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RC0000X

License✔ Licensed in CA · G32627

Definition

An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

Other Names 1

Former Legal Business NameJohn Y. Hess, M.d., A Medical Corporation

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

Other Providers at the Same Location NPPES 20

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

KOLAR N MURTHY M.D.

Psychiatry & Neurology (Neurology)

2220 LYNN RD, SUITE 300
THOUSAND OAKS, CA 91360

Ventura County (805) 495-6702

JOHN Y. HESS M.D.

Internal Medicine (Cardiovascular Disease)

2220 LYNN RD, 201
THOUSAND OAKS, CA 91360

Ventura County (805) 494-9494

LAWRENCE SPINNER M.D. A MEDICAL CORPORATION

Pediatrics

2220 LYNN RD, 109
THOUSAND OAKS, CA 91360

Ventura County (805) 497-9419

DR. JOY EDWARDS-BECKETT PHD, DNSC, FNP.C, CW

Nurse Practitioner (Family)

2220 LYNN RD, SUITE 102
THOUSAND OAKS, CA 91360

Ventura County (805) 494-1222

JEFFREY TSENG, MD, INC.

Clinic/Center (Medical Specialty)

2220 LYNN RD, SUITE 109
THOUSAND OAKS, CA 91360

Ventura County (805) 496-8103

CHARLES P. JOHNSON, M.D., INC .

Internal Medicine (Cardiovascular Disease)

2220 LYNN RD, SUITE 203
THOUSAND OAKS, CA 91360

Ventura County (805) 494-9494

DR. ARNOLD R RUDMAN D.D.S.

Dentist (General Practice)

2220 LYNN RD, SUITE 305
THOUSAND OAKS, CA 91360

Ventura County (805) 497-3749

SUJAY DUTTA MD

Internal Medicine (Infectious Disease)

2220 LYNN RD, SUITE 301
THOUSAND OAKS, CA 91360

Ventura County (805) 495-1073

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 John Y Hess MD A Medical Corporation's NPI number?

The NPI number for John Y Hess MD A Medical Corporation is 1780796151. It was assigned to this organization in the NPPES registry on August 31, 2006. The provider was formerly known as John Y. Hess, M.D., A Medical Corporation.

Where is John Y Hess MD A Medical Corporation located?

John Y Hess MD A Medical Corporation is located at 2220 Lynn Rd Suite 203, Thousand Oaks, CA 91360. The listed phone number is (805) 494-9494.

What is John Y Hess MD A Medical Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

When was this NPI record last updated?

The NPPES record for John Y Hess MD A Medical Corporation was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.