Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ernest James Mencer, M.D.

Surgery Physician in Baton Rouge, LA · enumerated 2005.

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

National Provider Identifier

1639154412

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Registry record

Entity type Individual (Type 1)

Name Ernest James Mencer

Credential M.D.

Sex Male

Practice address 3401 North Blvd, Suite 200-B, Baton Rouge, LA, 70806

Phone (225) 381-2615

Fax (225) 381-2638

Enumeration date Dec 14, 2005

Last updated in NPPES Apr 30, 2014

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 04216R (LA) 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
1182061	Medicaid	LA	-
312433YUB6	Other	LA	MEDICARE PTAN

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 Ernest Mencer's NPI record?

Cross-check NPI 1639154412 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1639154412 active?

Yes, as of the latest NPPES snapshot, NPI 1639154412 is active (record last updated 2014-04-30).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-04-30.