Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Donald Thomas Hay, M.D.
Urology Physician in Concord, CA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1740288836
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Registry record
Entity type Individual (Type 1)
Name Donald Thomas Hay
Credential M.D.
Sex Male
Practice address 2222 East St, Ste 250, Concord, CA, 94520
Phone (925) 689-6211
Fax (925) 689-3857
Enumeration date Jul 12, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| GR0067920 | Medicaid | CA | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What specialty is Donald Hay?
Donald Hay is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Stephen Taylor Urology Physician · Concord, CA NPI 1356349831 Jeremy Lieb Urology Physician · Concord, CA NPI 1093713190 Judson Brandeis Urology Physician · Concord, CA NPI 1831197920 Bay Area Cardiology Medical Group Interventional Cardiology Physician · Concord, CA NPI 1750363248 Contra Costa Eye Medical Center Inc Ophthalmology Physician · Concord, CA NPI 1093791188 Karen Graham Ophthalmology Physician · Concord, CA NPI 1124004213 Premier Surgery Center Ambulatory Surgical Clinic/Center · Concord, CA NPI 1558339424 Eric Mariotti Plastic and Reconstructive Surgery Physician · Concord, CA NPI 1053389205
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.