Dr. Nathanael S. Dayes, MD
- Medicare services, 2024
- 161
- Medicare patients, 2024
- 187
- Part D claims, 2024
- 21
- MIPS score, 2024
- 100
- Hospital affiliations
- 2
- Practice address
- 3636 High Street, Portsmouth, VA 23707
- Practice phone
- Call (757) 398-2200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Dayes' 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. Nathanael S. Dayes is a vascular surgeon in Portsmouth, Virginia
Dr. Dayes practices at Bon Secours Maryview Medical Center in Portsmouth, Virginia, part of Bon Secours Mercy Health.
Dr. Dayes' NPI, 1487851853, was assigned on June 29, 2007. Dr. Dayes holds Maryland license D73653.
- NPI
- 1487851853NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3779726948
- NPI enumeration date
- June 29, 2007
- NPI status
- Active
- Practice phone
- (757) 398-2200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Nathanael S. Dayes practices at Bon Secours Maryview Medical Center in Portsmouth, Virginia
Dr. Dayes' primary practice is Bon Secours Maryview Medical Center, at 3636 High Street, Portsmouth, VA 23707 in Portsmouth City. The practice phone is (757) 398-2200.
- Bon Secours Maryview Medical Center3636 High Street, Portsmouth, VA 23707 · Portsmouth CityPhone(757) 398-2200
Source: Dmand AI Affiliation Data
Dr. Nathanael S. Dayes is affiliated with 7 sites of care and 7 medical groups
Dr. Dayes' primary practice is Bon Secours Maryview Medical Center in Portsmouth, Virginia, part of Bon Secours Mercy Health. Dr. Dayes is also affiliated with UPMC Harrisburg. The medical group on file is Bon Secours Hampton Roads Medical Group. Dmand AI also links Dr. Dayes to 6 more medical groups, 4 group practices and clinics and 1 physician office, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nathanael S. Dayes' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Dayes practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Bon Secours Maryview Medical Center | Available with a free account |
| +6 more sites and 6 medical groups | 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 Bon Secours Mercy Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Nathanael S. Dayes is one of 142 vascular surgeons in Virginia
Vascular surgery is Dr. Dayes' primary specialty in the NPI Registry, under taxonomy code 2086S0129X. Dmand AI has Dr. Dayes' licenses on file in 3 states: Maryland, New York and Virginia.
Specialties and state licenses
- Vascular surgery, MarylandPrimary
- Surgery, New York
- Virginia license
Vascular surgeons near Dr. Dayes
Counts of vascular 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. Nathanael S. Dayes billed Medicare for 161 services in 2024
CMS data shows 161 Medicare services from Dr. Dayes across 6 procedure codes in 2024, for 187 Medicare patients. Medicare paid $6,659 for them.
Dr. Dayes' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 1262024: 1196%
- Office and hospital visits
- 2023: 132024: 42223%
Where Dr. Dayes' Medicare services took place, 2024
- In an office4226%
- In a facility11974%
Dr. Dayes compared with the Virginia median for vascular surgeons, 2024
- Dr. Dayes
- Virginia median
- Medicare services
- 161vs 90082% below
- Medicare patients
- 187vs 56667% below
- Part D claims
- 15vs 8582% below
Medians across 137 vascular surgeons in Virginia with Dmand AI profiles that report each measure.
Dr. Dayes' 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. Nathanael S. Dayes treated 187 Medicare patients in 2024, average age 74
CMS counts 187 Medicare patients who saw Dr. Dayes in 2024. The largest group is 65 to 74, with 69 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 28% are also on Medicaid. Their average risk score is 3.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Dayes' median patient age at 68, with 51% women.
Dr. Dayes' Medicare patients by age, 2024
Dr. Dayes' Medicare patients by sex, 2024
- Women8948%
- Men9852%
Chronic conditions among Dr. Dayes' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease66%
- Diabetes63%
- Ischemic heart disease56%
- Arthritis51%
- Heart failure47%
- Atrial fibrillation35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Dayes' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nathanael S. Dayes wrote 21 Medicare Part D claims in 2024
In 2024, Dr. Dayes wrote 21 Medicare Part D claims for 13 patients. 95% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $1,027 in total drug cost. In 2021, CMS named 125 claims across 4 drugs.
Dr. Dayes' Part D claims by kind of drug, 2024
- Generic20 claims95%
- Brand-name and other1 claims5%
Dr. Dayes' most prescribed drugs by claims, 2022
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. Dayes' Part D claims, 2024
- Opioids62%13 of 21 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, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 1252022: 1588%
Drugs named by CMS: 1 in 2022, 4 in 2021.
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. Nathanael S. Dayes scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Dayes for performance year 2024, reported as part of a group. CMS counts 11 procedures of leg revascularization (restoring blood flow) by Dr. Dayes, more than 64% of the clinicians it reports for that procedure.
Dr. Dayes' MIPS scores, performance year 2024
- 100of 100Final score
- 98of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Dayes ranks in Medicare procedure volume
- Leg revascularization (restoring blood flow)
- 64th percentile11 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Varicose vein removal: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Nathanael S. Dayes received $7,385 in industry payments from 2021 to 2025
CMS Open Payments shows 74 general payments to Dr. Dayes from 17 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 64% of the total. Penumbra, Inc. paid the most, $1,882.
General payments to Dr. Dayes by program year, 2021 to 2025
General payments to Dr. Dayes by kind, 2021 to 2025
- Food and beverage$4,76264%
- Travel and lodging$2,62336%
Companies that paid Dr. Dayes the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Nathanael S. Dayes'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 DataDmand AI Org Hierarchy 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 | Clinician Public Reporting: Overall MIPS Performance (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) |
| 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. Nathanael S. Dayes
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. Nathanael S. Dayes' NPI number?
Dr. Nathanael S. Dayes' NPI number is 1487851853. It was assigned on June 29, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Nathanael S. Dayes?
Dr. Nathanael S. Dayes is a vascular surgeon in Portsmouth, Virginia. The primary specialty in the NPI Registry is Vascular Surgery Physician (taxonomy code 2086S0129X).
Where does Dr. Nathanael S. Dayes practice?
Dr. Dayes practices at 3636 High Street, Portsmouth, VA 23707. Dr. Dayes' primary practice is Bon Secours Maryview Medical Center in Portsmouth, Virginia, part of Bon Secours Mercy Health. Dmand AI also links Dr. Dayes to 6 medical groups, 4 group practices and clinics and 1 physician office.
What is Dr. Nathanael S. Dayes' office phone number?
The practice phone on file for Dr. Dayes is (757) 398-2200.
What is Dr. Nathanael S. Dayes' medical license number?
Dr. Dayes holds Maryland license D73653, one of the licenses on file in 3 states.
Which states has Dr. Nathanael S. Dayes been licensed in?
Dmand AI has state licenses on file for Dr. Dayes in Maryland, New York and Virginia.
Which hospitals is Dr. Nathanael S. Dayes affiliated with?
Dr. Dayes practices at Bon Secours Maryview Medical Center in Portsmouth, Virginia. Dr. Dayes is also affiliated with UPMC Harrisburg.
What medical group is Dr. Nathanael S. Dayes part of?
Dr. Dayes is linked to Bon Secours Hampton Roads Medical Group. Dmand AI links Dr. Dayes to 6 more medical groups.
Does Dr. Nathanael S. Dayes accept Medicare?
Yes. CMS data shows Dr. Dayes billed Medicare for 161 services in 2024.
What is Dr. Nathanael S. Dayes' MIPS score?
Dr. Dayes' MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Nathanael S. Dayes see?
CMS counts 187 Medicare patients who saw Dr. Dayes in 2024, with an average age of 74.
What services does Dr. Nathanael S. Dayes bill to Medicare?
In 2024, Dr. Dayes' most billed Medicare services were blood vessel study (93880), blood vessel study (93971) and blood vessel study (93970).
What drugs does Dr. Nathanael S. Dayes prescribe most?
In 2022 Medicare Part D data, Dr. Dayes' most prescribed drugs by claims were Cilostazol.
Has Dr. Nathanael S. Dayes received payments from drug or device companies?
CMS Open Payments shows $7,385 in general payments to Dr. Dayes from 17 companies from 2021 to 2025. The largest total came from Penumbra, Inc.
How long has Dr. Nathanael S. Dayes been practicing?
Dr. Dayes graduated from medical school in 2006, 20 years ago.
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