Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary Roy, M.D.
Specialist in Naperville, IL · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1477679025
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Registry record
Entity type Individual (Type 1)
Name Dr. Mary Roy
Credential M.D.
Sex Female
Practice address 4355 Montgomery Rd, Naperville, IL, 60564
Phone (630) 236-8300
Fax (630) 236-6890
Enumeration date Mar 22, 2007
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
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
Is NPI 1477679025 active?
Yes, as of the latest NPPES snapshot, NPI 1477679025 is active (record last updated 2007-07-08).
How do I verify Mary Roy's NPI record?
Cross-check NPI 1477679025 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.