Dr. Johnstuart M. Guarnieri, MD
- Medicare services, 2024
- 690
- Medicare patients, 2024
- 168
- Part D claims, 2024
- 72
- Hospital affiliations
- 2
- Industry payments
- $222
- Practice address
- 100 Sentara Circle, Williamsburg, VA 23188
- Practice phone
- Call (757) 984-7409
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sentara Williamsburg Regional - Unit
Acute Care Hospital-Unit · Williamsburg, Virginia
Find Dr. Guarnieri's professional email, personal email and mobile number
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Dr. Johnstuart M. Guarnieri is a plastic surgeon in Williamsburg, Virginia
Dr. Guarnieri practices at Sentara Williamsburg Regional - Unit in Williamsburg, Virginia.
Dr. Guarnieri's NPI, 1215025200, was assigned on October 11, 2006. Dr. Guarnieri graduated from Eastern Virginia Medical School in 1985. Dr. Guarnieri holds Virginia license 0101041390.
- NPI
- 1215025200NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365433257
- NPI enumeration date
- October 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (757) 984-7409
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Johnstuart M. Guarnieri practices at Sentara Williamsburg Regional - Unit in Williamsburg, Virginia
Dr. Guarnieri's primary practice is Sentara Williamsburg Regional - Unit, at 100 Sentara Circle, Williamsburg, VA 23188 in James City. The practice phone is (757) 984-7409.
- Sentara Williamsburg Regional - Unit100 Sentara Circle, Williamsburg, VA 23188 · James CityPhone(757) 984-7409
Source: Dmand AI Affiliation Data
Dr. Johnstuart M. Guarnieri is affiliated with 3 sites of care
Dr. Guarnieri's primary practice is Sentara Williamsburg Regional - Unit in Williamsburg, Virginia. Dr. Guarnieri is also affiliated with Sentara Williamsburg Regional Medical Center. Dmand AI also links Dr. Guarnieri to 1 more physician office, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Johnstuart M. Guarnieri's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Guarnieri practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sentara Williamsburg Regional - Unit | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Johnstuart M. Guarnieri is one of 130 plastic surgeons in Virginia
Plastic surgery is Dr. Guarnieri's primary specialty in the NPI Registry, under taxonomy code 208200000X. Dr. Guarnieri is licensed in Virginia.
Specialties and state licenses
- Plastic surgery, VirginiaPrimary
Plastic surgeons near Dr. Guarnieri
Counts of plastic surgeons 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. Johnstuart M. Guarnieri billed Medicare for 690 services in 2024
CMS data shows 690 Medicare services from Dr. Guarnieri across 14 procedure codes in 2024, for 168 Medicare patients. Medicare paid $77,492 for them. Every service was in an office.
Dr. Guarnieri's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3952024: 4237%
- Surgery
- 2023: 1932024: 26738%
Dr. Guarnieri compared with the Virginia median for plastic surgeons, 2024
- Dr. Guarnieri
- Virginia median
- Medicare services
- 690vs 6211.1 times
- Medicare patients
- 168vs 563.0 times
- Part D claims
- 26vs 248% above
Medians across 113 plastic surgeons in Virginia with Dmand AI profiles that report each measure.
Dr. Guarnieri'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Johnstuart M. Guarnieri treated 168 Medicare patients in 2024, average age 78
CMS counts 168 Medicare patients who saw Dr. Guarnieri in 2024. The largest group is 75 to 84, with 67 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.18, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Guarnieri's median patient age at 72, with 57% women.
Dr. Guarnieri's Medicare patients by age, 2024
Dr. Guarnieri's Medicare patients by sex, 2024
- Women8651%
- Men8249%
Chronic conditions among Dr. Guarnieri's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Diabetes27%
- Ischemic heart disease25%
- Atrial fibrillation24%
- Cancer24%
- Chronic kidney disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Guarnieri's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Johnstuart M. Guarnieri wrote 72 Medicare Part D claims in 2024
In 2024, Dr. Guarnieri wrote 72 Medicare Part D claims for 43 patients. 86% of them were for generic drugs. CMS names the drug for 26 of them, across 2 drugs with 11 or more claims each, at $814 in total drug cost. In 2023, CMS named 48 claims across 3 drugs.
Dr. Guarnieri's Part D claims by kind of drug, 2024
- Generic62 claims86%
- Brand-name and other10 claims14%
Dr. Guarnieri'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. Guarnieri's Part D claims, 2024
- Antibiotics25%18 of 72 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: 482024: 2646%
Drugs named by CMS: 2 in 2024, 3 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. Johnstuart M. Guarnieri ranks in the 91st percentile for melanoma (skin cancer) excision in Medicare
Dr. Guarnieri accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 84 procedures of melanoma (skin cancer) excision by Dr. Guarnieri, more than 91% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Guarnieri ranks in Medicare procedure volume
- Melanoma (skin cancer) excision
- 91st percentile84 procedures
- Removal or shaving of skin growth
- 83rd percentile84 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)
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)
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Dr. Johnstuart M. Guarnieri received $222 in industry payments from 2017 to 2025
CMS Open Payments shows 8 general payments to Dr. Guarnieri from 4 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $119.
General payments to Dr. Guarnieri by program year, 2017 to 2025
Companies that paid Dr. Guarnieri the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Johnstuart M. Guarnieri graduated from Eastern Virginia Medical School
Dr. Guarnieri graduated from Eastern Virginia Medical School in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Johnstuart M. Guarnieri'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. Johnstuart M. Guarnieri
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. Johnstuart M. Guarnieri's NPI number?
Dr. Johnstuart M. Guarnieri's NPI number is 1215025200. It was assigned on October 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Johnstuart M. Guarnieri?
Dr. Johnstuart M. Guarnieri is a plastic surgeon in Williamsburg, Virginia. The primary specialty in the NPI Registry is Plastic Surgery Physician (taxonomy code 208200000X).
Where does Dr. Johnstuart M. Guarnieri practice?
Dr. Guarnieri practices at 100 Sentara Circle, Williamsburg, VA 23188. Dr. Guarnieri's primary practice is Sentara Williamsburg Regional - Unit in Williamsburg, Virginia. Dmand AI also links Dr. Guarnieri to 1 physician office.
What is Dr. Johnstuart M. Guarnieri's office phone number?
The practice phone on file for Dr. Guarnieri is (757) 984-7409.
What is Dr. Johnstuart M. Guarnieri's medical license number?
Dr. Guarnieri holds Virginia license 0101041390.
Which hospitals is Dr. Johnstuart M. Guarnieri affiliated with?
Dr. Guarnieri is affiliated with Sentara Williamsburg Regional Medical Center. Dmand AI links Dr. Guarnieri to 1 more hospital.
Does Dr. Johnstuart M. Guarnieri accept Medicare?
Yes. CMS data shows Dr. Guarnieri billed Medicare for 690 services in 2024, and Dr. Guarnieri accepts Medicare assignment.
How many Medicare patients does Dr. Johnstuart M. Guarnieri see?
CMS counts 168 Medicare patients who saw Dr. Guarnieri in 2024, with an average age of 78.
What services does Dr. Johnstuart M. Guarnieri bill to Medicare?
In 2024, Dr. Guarnieri's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99204) and surgery: skin and soft tissue (11311).
Where did Dr. Johnstuart M. Guarnieri go to medical school?
Dr. Guarnieri graduated from Eastern Virginia Medical School in 1985.
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What drugs does Dr. Johnstuart M. Guarnieri prescribe most?
In 2024 Medicare Part D data, Dr. Guarnieri's most prescribed drugs by claims were Fluorouracil and Mupirocin.
Has Dr. Johnstuart M. Guarnieri received payments from drug or device companies?
CMS Open Payments shows $222 in general payments to Dr. Guarnieri from 4 companies from 2017 to 2025. The largest total came from Allergan Inc.
How long has Dr. Johnstuart M. Guarnieri been practicing?
Dr. Guarnieri graduated from medical school in 1985, 41 years ago.
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