Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory P. Mclennan II, MD

Urology Physician in Saint Louis, MO · enumerated 2008.

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

National Provider Identifier

1912160052

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Registry record

Entity type Individual (Type 1)

Name Gregory P. Mclennan II

Credential MD

Sex Male

Practice address 701 S. New Ballas Road, Suite 330, Saint Louis, MO, 63141

Phone (314) 251-8850

Enumeration date Jul 9, 2008

Last updated in NPPES Sep 2, 2026

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 2014009247 (MO) 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
1912160052	Medicaid	MO	-
P01366917	Other	MO	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 Gregory Mclennan's NPI record?

Cross-check NPI 1912160052 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1912160052 active?

Yes, as of the latest NPPES snapshot, NPI 1912160052 is active (record last updated 2026-09-02).

Other providers at this practice address

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Hannah Kasunic Physician Assistant · Saint Louis, MO NPI 1588289979 Gurdarshan Sandhu Urology Physician · Saint Louis, MO NPI 1083902852

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-09-02.