William Grant Day, M.D.
Allergy & Immunology Physician · Portsmouth, VA
William Grant Day, M.D. is an allergy & immunology physician with a practice address in Portsmouth, Virginia, and NPI 1740745041, issued on Jan 31, 2019. Check the license (Virginia 0101271195, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- William Grant Day
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- 0101271195 VA
Self-reported in NPPES; status is on the state search - Practice location
- 620 John Paul Jones Cir Ste 275, Portsmouth, VA 23708
- Phone
- (757) 953-2000
- Enumerated
- Jan 31, 2019
- Record last updated
- Jun 30, 2026
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 136 in Virginia → Look up another NPI →
Also registered at 620 John Paul Jones Cir Ste 275
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mary Bacon, RN BSN CCMCase Management Registered Nurse1407670987
- Elisha Bolton, APRNClinical Nurse Specialist1245195866
- Karen Brayboy, MSN, CNMAdvanced Practice Midwife1184625030
- Allison Brindle, DOGeneral Practice Physician1689268054
- Taylor Brocuglio, CRNACertified Registered Nurse Anesthetist1962177865
- Maxine Butler, RN BSN MSHCACase Management Registered Nurse1538981360
Verify William Grant Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101271195Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $51.38
2 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William Grant Day among 136 allergy & immunology physician records in Virginia
William Grant Day, M.D. is one of 136 allergy & immunology physician records with a practice address in Virginia. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 93% of them.
- NPI issued2019 · 93% of these records are older, 4% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 71% of these records are
- Record last updated2026 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Virginia
There are 136 allergy & immunology physician records in Virginia.
All 136 in Virginia → Every provider in Portsmouth → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kenneth King, M.D.Hampton, VA 236661942206651
- Veronica AlixHampton, VA 236651023470838
- Ann Zilliox, M.D.Newport News, VA 236061841284650
- Muhammad Fiaz, MDFort Eustis, VA 236041467435628
- Angela Hogan, M.D.Norfolk, VA 235071407809023
- Lauren Smith, M.D.Norfolk, VA 235071841428729
- Burton Moss, MDNorfolk, VA 235051285634253
- Jeremy Owens, MDVirginia Beach, VA 234621740743053
Common questions
What is William Grant Day, M.D.'s NPI number?
William Grant Day, M.D.'s National Provider Identifier (NPI) is 1740745041, issued on Jan 31, 2019. An NPI identifies a provider in billing; it is not a license.
Where is William Grant Day, M.D. located?
The NPPES record lists a practice address at 620 John Paul Jones Cir Ste 275, Portsmouth, VA, 23708. Phone: (757) 953-2000. Providers update this record themselves, so call before visiting.
How can I verify William Grant Day, M.D.'s license?
NPPES lists Virginia license number 0101271195, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.