Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Karen B Duffy, MD

Q: What is the NPI number for Karen Duffy?

The National Provider Identifier (NPI) for Karen Duffy is 1174543516, a Type 1 (individual) record in the CMS NPPES registry.

General Practice Physician in Madison, TN · enumerated 2006.

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

National Provider Identifier

1174543516

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Registry record

Entity type Individual (Type 1)

Name Ms. Karen B Duffy

Credential MD

Sex Female

Practice address 1210 Briarville Road, Blding B, Madison, TN, 37115

Phone (615) 868-9959

Fax (615) 865-1463

Enumeration date Jul 20, 2006

Last updated in NPPES May 30, 2018

Taxonomy & licenses

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License MD0000008280 (TN) Primary

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
3185053	Medicaid	TN	-

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

What is the NPI number for Karen Duffy?

The National Provider Identifier (NPI) for Karen Duffy is 1174543516, a Type 1 (individual) record in the CMS NPPES registry.

Where does Karen Duffy practice?

The practice location on file with NPPES is in Madison, TN. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-05-30.