William Day, M.D.
William Day, M.D. holds NPI 1740745041, with a primary taxonomy of allergy & immunology physician and a practice location in Portsmouth, VA. The number was issued on January 31, 2019 and the NPPES record was last updated on June 30, 2026. The record lists 2 taxonomy codes.
Taxonomies and licenses
| Taxonomy | Code | License |
|---|---|---|
| Allergy & Immunology Physician Primary | 207K00000X | 0101271195 (VA) |
| Internal Medicine Physician | 207R00000X | 0101271195 (VA) |
Practice location
Local context
Active NPPES records list 19 providers with allergy & immunology physician as the primary taxonomy within 25 miles of this practice location's ZIP code, 8 of them within 10 miles.
The same primary taxonomy is listed by 184 in Virginia and 5,559 nationwide.
These are counts from NPPES records, not a ranking or recommendation. Distances are measured between ZIP code centers, not street addresses.
Record history
- Name on record
- Dr. William Grant Day
- Status
- Active
- NPI issued
- Last updated in NPPES
Is this your record? Updates are made through NPPES, the official National Plan and Provider Enumeration System.
NPPES data as of · Source: CMS NPPES
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curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://api.npilayer.com/v1/providers/1740745041"