Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Kenneth Mark Duffy, M.D.

Family Medicine Physician in Seiling, OK · enumerated 2005.

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

National Provider Identifier

1164421970

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Registry record

Entity type Individual (Type 1)

Name Kenneth Mark Duffy

Credential M.D.

Sex Male

Practice address Seiling, OK, 73663

Phone (580) 922-4283

Fax (580) 922-7717

Enumeration date Jul 14, 2005

Last updated in NPPES Jun 5, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 12688 (OK) 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
100094530A	Medicaid	OK	-
0154440001	Other	-	PALMETTO MEDICARE
010018239	Other	-	RAILROAD MEDICARE

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

How do I verify Kenneth Duffy's NPI record?

Cross-check NPI 1164421970 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1164421970 active?

Yes, as of the latest NPPES snapshot, NPI 1164421970 is active (record last updated 2009-06-05).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-05.