Doctor profile · Federal record
Dr. William Day, M.D.
Allergy & Immunology Physician · Internal Medicine Physician · Portsmouth, VA
- NPI 1740745041
- 7 yrs on file
- Male
- Solo practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
620 John Paul Jones Cir Ste 275
Portsmouth, VA 237082197
(757) 953-2000 - Additional location
-
8901 Rockville Pike
Bethesda, MD 208890001
(757) 953-5000 - Mailing address
-
37 Serenity Ln
Suffolk, VA 234331200
Credentials & registration
- NPI registered
- January 2019 — 7 yrs on file
- Profile last updated
- June 18, 2025
- Specialty taxonomy
- 207K00000X — NUCC code
- State license (1)
- Virginia #0101271195
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1740745041. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$51
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Genzyme Corporation | 1 | $35.46 | |
| AstraZeneca Pharmaceuticals Lp | 1 | $15.92 |
By nature of payment
Frequently asked questions
What is Dr. William Day's medical specialty?
Dr. William Day practices Allergy & Immunology Physician in Portsmouth, VA.
Where does Dr. William Day practice?
Dr. William Day practices at 620 John Paul Jones Cir Ste 275, Portsmouth, VA 237082197. Office phone: 7579532000.
What is Dr. William Day's NPI?
Dr. William Day's National Provider Identifier (NPI) is 1740745041, issued by NPPES.