Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John W Derr Jr., M. D.

Specialist in Louisville, KY · enumerated 2005.

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

National Provider Identifier

1801883988

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name John W Derr Jr.

Credential M. D.

Sex Male

Practice address 4001 Kresge Way, Suite 320, Louisville, KY, 40207

Phone (502) 895-5850

Fax (502) 895-1210

Enumeration date Oct 4, 2005

Last updated in NPPES Oct 21, 2014

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 25991 (KY) 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
100345240B	Medicaid	IN	-
64259914	Medicaid	KY	-

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 John Derr's NPI record?

Cross-check NPI 1801883988 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1801883988 active?

Yes, as of the latest NPPES snapshot, NPI 1801883988 is active (record last updated 2014-10-21).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-10-21.