Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William A Greisner, MD

Allergy & Immunology Physician in Lexington, KY · enumerated 2006.

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

National Provider Identifier

1720095334

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Registry record

Entity type Individual (Type 1)

Name William A Greisner

Credential MD

Sex Male

Practice address 171 North Eagle Creek Drive, Suite 106, Lexington, KY, 40509

Phone (859) 277-9112

Fax (859) 277-7105

Enumeration date Aug 3, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License 32610 (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
000000045610	Other	KY	BLUE CROSS BLUE SHIELD
64326101	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 William Greisner's NPI record?

Cross-check NPI 1720095334 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1720095334 active?

Yes, as of the latest NPPES snapshot, NPI 1720095334 is active (record last updated 2007-07-08).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.