Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Lois Estelle Knapp, MD
Specialist in Bethesda, MD · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1578564514
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Registry record
Entity type Individual (Type 1)
Name Dr. Lois Estelle Knapp
Credential MD
Sex Female
Practice address National Naval Medical Center, 8901 Wisconsin Avenue, Bethesda, MD, 20889
Phone (301) 319-4963
Enumeration date Aug 1, 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
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
How do I verify Lois Knapp's NPI record?
Cross-check NPI 1578564514 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1578564514 active?
Yes, as of the latest NPPES snapshot, NPI 1578564514 is active (record last updated 2007-07-08).
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.