Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Karen Lynne Fox, CRNP

Adult Health Nurse Practitioner in Rockville, MD · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1821153925

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Registry record

Entity type Individual (Type 1)

Name Mrs. Karen Lynne Fox

Credential CRNP

Sex Female

Practice address 10110 Molecular Drive, Suite 206, Rockville, MD, 20850

Phone (301) 279-2779

Fax (240) 403-0190

Enumeration date Dec 27, 2006

Last updated in NPPES Mar 29, 2012

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License R097054 (MD) Primary

Other identifiers

Identifier	Type	State	Issuer
227221100	Medicaid	MD	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1821153925 active?

Yes, as of the latest NPPES snapshot, NPI 1821153925 is active (record last updated 2012-03-29).

How do I verify Karen Fox's NPI record?

Cross-check NPI 1821153925 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-03-29.