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

Arnold R Tag, MD

Undersea and Hyperbaric Medicine (Preventive Medicine) Physician in Memphis, TN · enumerated 2006.

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

National Provider Identifier

1821190109

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Registry record

Entity type Individual (Type 1)

Name Arnold R Tag

Credential MD

Sex Male

Practice address Memphis, TN, 38128

Phone (901) 682-6828

Enumeration date Sep 5, 2006

Last updated in NPPES Jun 12, 2009

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

Taxonomy & licenses

2083P0011X Undersea and Hyperbaric Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License MD09336 (TN) 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
136868	Other	TN	B/H
4165	Other	TN	TLC
040011136	Other	-	RR MED
4046854	Other	TN	B/C

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

Is NPI 1821190109 active?

Yes, as of the latest NPPES snapshot, NPI 1821190109 is active (record last updated 2009-06-12).

How do I verify Arnold Tag's NPI record?

Cross-check NPI 1821190109 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-12.