Dr. Guy Delorefice, MD
- Medicare services, 2024
- 1,118
- Medicare patients, 2024
- 199
- Part D claims, 2024
- 3,260
- Hospital affiliations
- 3
- Industry payments
- $1,121
- Practice address
- 370 Perkins St, Sonoma, CA 95476-6827
- Practice phone
- Call (707) 938-1255
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Guy Delorefice, MD (Sonoma County Concierge Medicine)
Physician office · Sonoma, California
Find Dr. Delorefice's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Guy Delorefice is an internist in Sonoma, California
Dr. Delorefice practices at Guy Delorefice, MD (Sonoma County Concierge Medicine) in Sonoma, California.
Dr. Delorefice's NPI, 1952426421, was assigned on March 20, 2007. Dr. Delorefice graduated from Creighton University School of Medicine in 1996. Dr. Delorefice holds California license A0689180.
- NPI
- 1952426421NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789744715
- NPI enumeration date
- March 20, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (707) 938-1255
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Guy Delorefice practices at Guy Delorefice, MD (Sonoma County Concierge Medicine) in Sonoma, California
Dr. Delorefice's primary practice is Guy Delorefice, MD (Sonoma County Concierge Medicine), at 370 Perkins St, Sonoma, CA 95476-6827. The practice phone is (707) 938-1255.
- Guy Delorefice, MD (Sonoma County Concierge Medicine)370 Perkins St, Sonoma, CA 95476-6827Phone(707) 938-1255
Source: Dmand AI Affiliation Data
Dr. Guy Delorefice is affiliated with 4 sites of care
Dr. Delorefice's primary practice is Guy Delorefice, MD (Sonoma County Concierge Medicine) in Sonoma, California. Dr. Delorefice is also affiliated with Sonoma Valley Hospital. Dmand AI also links Dr. Delorefice to 2 more hospitals, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Guy Delorefice's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Delorefice practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Guy Delorefice, MD (Sonoma County Concierge Medicine) | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Guy Delorefice is one of 16,751 internists in California
Internal medicine is Dr. Delorefice's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Delorefice is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Delorefice
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guy Delorefice billed Medicare for 1,118 services in 2024
CMS data shows 1,118 Medicare services from Dr. Delorefice across 12 procedure codes in 2024, for 199 Medicare patients. Medicare paid $80,607 for them. Every service was in an office.
Dr. Delorefice's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5832024: 5525%
- Other services
- 2023: 3572024: 29019%
- Tests and treatments
- 2023: 4022024: 26335%
- Surgery
- 2023: 192024: 1332%
- Drugs given in the office
- 2023: 1462024: 0100%
Dr. Delorefice compared with the California median for internists, 2024
- Dr. Delorefice
- California median
- Medicare services
- 1,118vs 3613.1 times
- Medicare patients
- 199vs 15132% above
- Part D claims
- 2,667vs 4216.3 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Delorefice's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Delorefice?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Delorefice and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Guy Delorefice treated 199 Medicare patients in 2024, average age 77
CMS counts 199 Medicare patients who saw Dr. Delorefice in 2024. The largest group is 75 to 84, with 98 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 0.93, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Delorefice's median patient age at 77, with 46% women.
Dr. Delorefice's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Delorefice's Medicare patients by sex, 2024
- Women9749%
- Men10251%
Chronic conditions among Dr. Delorefice's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Arthritis41%
- Ischemic heart disease33%
- Atrial fibrillation22%
- Chronic kidney disease18%
- Cancer16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Delorefice's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Guy Delorefice wrote 3,260 Medicare Part D claims in 2024
In 2024, Dr. Delorefice wrote 3,260 Medicare Part D claims for 199 patients. 89% of them were for generic drugs. CMS names the drug for 2,667 of them, across 74 drugs with 11 or more claims each, at $199,386 in total drug cost. In 2023, CMS named 2,607 claims across 74 drugs.
Dr. Delorefice's Part D claims by kind of drug, 2024
- Generic2,887 claims89%
- Brand-name355 claims11%
- Other18 claims1%
Dr. Delorefice's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Delorefice's Part D claims, 2024
- Opioids2%72 of 3,260 claims
- Antibiotics5%170 of 3,260 claims
- Antipsychotics, patients 65 and over0%13 of 3,260 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,6072024: 2,6672%
Drugs named by CMS: 74 in 2024, 74 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Guy Delorefice offers telehealth to Medicare patients
Dr. Delorefice accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Delorefice as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Guy Delorefice received $1,121 in industry payments from 2016 to 2023
CMS Open Payments shows 10 general payments to Dr. Delorefice from 4 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. Medtronic, Inc. paid the most, $586.
General payments to Dr. Delorefice by program year, 2016 to 2023
Companies that paid Dr. Delorefice the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Guy Delorefice graduated from Creighton University School of Medicine
Dr. Delorefice graduated from Creighton University School of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Guy Delorefice's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Guy Delorefice
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guy Delorefice's NPI number?
Dr. Guy Delorefice's NPI number is 1952426421. It was assigned on March 20, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Guy Delorefice?
Dr. Guy Delorefice is an internist in Sonoma, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Guy Delorefice practice?
Dr. Delorefice practices at 370 Perkins St, Sonoma, CA 95476-6827. Dr. Delorefice's primary practice is Guy Delorefice, MD (Sonoma County Concierge Medicine) in Sonoma, California. Dmand AI also links Dr. Delorefice to 2 hospitals.
What is Dr. Guy Delorefice's office phone number?
The practice phone on file for Dr. Delorefice is (707) 938-1255.
What is Dr. Guy Delorefice's medical license number?
Dr. Delorefice holds California license A0689180.
Which hospitals is Dr. Guy Delorefice affiliated with?
Dr. Delorefice is affiliated with Sonoma Valley Hospital. Dmand AI links Dr. Delorefice to 2 more hospitals.
Does Dr. Guy Delorefice accept Medicare?
Yes. CMS data shows Dr. Delorefice billed Medicare for 1,118 services in 2024, and Dr. Delorefice accepts Medicare assignment.
Does Dr. Guy Delorefice offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Delorefice as offering telehealth services.
How many Medicare patients does Dr. Guy Delorefice see?
CMS counts 199 Medicare patients who saw Dr. Delorefice in 2024, with an average age of 77.
What services does Dr. Guy Delorefice bill to Medicare?
In 2024, Dr. Delorefice's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and heart test or procedure (93000).
Show 4 more questionsShow fewer questions
Where did Dr. Guy Delorefice go to medical school?
Dr. Delorefice graduated from Creighton University School of Medicine in 1996.
What drugs does Dr. Guy Delorefice prescribe most?
In 2024 Medicare Part D data, Dr. Delorefice's most prescribed drugs by claims were Atorvastatin Calcium, Metoprolol Succinate and Hydrochlorothiazide.
Has Dr. Guy Delorefice received payments from drug or device companies?
CMS Open Payments shows $1,121 in general payments to Dr. Delorefice from 4 companies from 2016 to 2023. The largest total came from Medtronic, Inc.
How long has Dr. Guy Delorefice been practicing?
Dr. Delorefice graduated from medical school in 1996, 30 years ago.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card