DR. WILLIAM GRANT DAY (M.D.) – Allergy & Immunology Physician, NPI 1740745041
Allergy & Immunology Physician
Main info
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Profile Insights
NPPES metrics only — not quality of care.
Provider Addresses for DR. WILLIAM GRANT DAY (M.D.)
1019 WESTOVER AVE APT 12
NORFOLK, VA 235071431
Phone: (757) 613-6334
Type: Mailing
620 JOHN PAUL JONES CIR
PORTSMOUTH, VA 237082111
Phone: (757) 953-5000
Type: Location
8901 Rockville Pike
Bethesda, MD 208890001
Phone: (757) 953-5000
Type: Location
37 SERENITY LN
SUFFOLK, VA 234331200
Phone: (757) 613-6334
Type: Mailing
620 JOHN PAUL JONES CIR STE 275
PORTSMOUTH, VA 237082197
Phone: (757) 953-2000
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $51.
Total Amount is formed as General ($51) + Research ($0) + Ownership ($0) = $51.
Last reported payment date: 2024-10-04 • Largest payer in this snapshot: GENZYME CORPORATION ($35).
Total Amount
$51
General + Research + Ownership
Payments
2
Total payment records
General Amount
$51
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-04
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GENZYME CORPORATION | $35 |
| AstraZeneca Pharmaceuticals LP | $16 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2025-07-09
PECOS data refreshed: 2026-05-27
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 23507)
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