GUY DELOREFICE M.D. INC.
NPI 1033446125
Internal Medicine in Sonoma, CA

Q: What is Guy Delorefice M.D. Inc.'s NPI number?

The NPI number for Guy Delorefice M.D. Inc. is 1033446125. It was assigned to this organization in the NPPES registry on November 10, 2009.

Q: What is Guy Delorefice M.D. Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since November 10, 2009CLIA 05D2129745 · Waiver

370 PERKINS ST, SONOMA, CA 95476(707) 938-1255(707) 938-2321 Get Directions Write a Review

NPPES record last updated: December 4, 2018. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Guy Delorefice M.d. Inc. NPPES

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

GUY DELOREFICE M.D. INC. (NPI 1033446125) is a healthcare organization registered as an internal medicine in Sonoma, California and active in the NPI registry since November 2009. The organization holds a CLIA Waiver certificate valid through April 24, 2027 and lists Guy Delorefice, Officer, as its authorized official.

NPPES Registry Identity

NPI1033446125

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameGUY DELOREFICE M.D. INC.

Location Address370 PERKINS STSonoma, CA 95476-6827

Mailing Address370 Perkins StSonoma, CA 95476-6827 · (707) 938-1255 · Fax (707) 938-2321

Phone(707) 938-1255

Fax(707) 938-2321

Organization SubpartNo

Authorized OfficialGuy DeloreficeOfficer · (707) 938-1255

Enumeration DateNovember 10, 2009

Last NPPES UpdateDecember 4, 2018

✔ NPI 1033446125 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CA · A0689180

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

370 PERKINS ST, Sonoma, CA 95476

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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

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Guy Delorefice M.d. Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Guy Delorefice M.D. Inc., which bills Medicare for the services this clinician delivers.

Clinician (1)

Guy Delorefice, M.D.

Internal Medicine

NPI 1952426421

370 PERKINS ST
Sonoma, CA 95476

(707) 938-1255

✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 of Waiver 05D2129745

Guy Delorefice MD Inc · Sonoma, CA

Active · expires Apr 24, 2027

CLIA Number05D2129745

Laboratory TypePhysician Office

Certificate Effective DateApril 25, 2025

Certificate Expiration DateApril 24, 2027

Laboratory DirectorGuy Delorefice

Laboratory Phone(707) 938-1255

Laboratory LocationGuy Delorefice MD Inc370 Perkins St, Sonoma, CA 95476

CLIA data matches this NPI record on: Address Phone

This certificate is issued to a laboratory to perform only waived tests.

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 Guy Delorefice M.D. Inc.'s NPI number?

The NPI number for Guy Delorefice M.D. Inc. is 1033446125. It was assigned to this organization in the NPPES registry on November 10, 2009.

Where is Guy Delorefice M.D. Inc. located?

Guy Delorefice M.D. Inc. is located at 370 Perkins St, Sonoma, CA 95476. The listed phone number is (707) 938-1255.

What is Guy Delorefice M.D. Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Guy Delorefice M.D. Inc. enrolled in Medicare?

Yes. Guy Delorefice M.D. Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Guy Delorefice M.D. Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Guy Delorefice M.D. Inc.. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Guy Delorefice M.D. Inc. hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D2129745) is associated with this NPI, valid through April 24, 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 Guy Delorefice M.D. Inc. was last updated on December 4, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.