Guy Delorefice, M.D.
NPI 1952426421 · Internal Medicine Physician · Sonoma, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guy Delorefice, M.D. is a Internal Medicine Physician provider in Sonoma, CA (NPI 1952426421).
Provider details
- NPI number
- 1952426421
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A0689180 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,065 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 394 | $130 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 161 | $128 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 109 | $15 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 101 | $15 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 95 | $182 |
| Prostate Cancer Screening; Digital Rectal ExaminationG0102 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 74 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 243 | 62 |
| Metoprolol Succinate | 131 | 34 |
| Hydrochlorothiazide | 106 | 29 |
| Rosuvastatin Calcium | 97 | 26 |
| Losartan Potassium | 91 | 25 |
| Zolpidem Tartrate | 86 | 20 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-20
- Last updated
- 2017-05-10
Frequently asked questions
- What is Guy Delorefice's NPI number?
- Guy Delorefice's National Provider Identifier (NPI) is 1952426421, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guy Delorefice's specialty?
- Guy Delorefice is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Guy Delorefice located?
- Guy Delorefice's practice location on file with NPPES is 370 Perkins St, Sonoma, CA 95476-6827.
- What is Guy Delorefice's phone number?
- The practice phone number listed in the NPPES registry for Guy Delorefice is (707) 938-1255.
- Does Guy Delorefice accept Medicare?
- Guy Delorefice is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guy Delorefice's NPI active?
- Yes — Guy Delorefice's NPI (1952426421) is active in the NPPES registry as of the last update on 2017-05-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.