Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Louis Greenberg, M.D.

Pediatrics Physician in Frontenac, MO · enumerated 2005.

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

National Provider Identifier

1043219967

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Louis Greenberg

Credential M.D.

Sex Male

Practice address 585 Twin Fawns Dr, Frontenac, MO, 63131

Phone (602) 561-0367

Enumeration date Jul 21, 2005

Last updated in NPPES Apr 20, 2026

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 21921 (AZ) Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License R7G09 (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
418677	Medicaid	AZ	-
200260860	Medicaid	IN	-

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 1043219967 active?

Yes, as of the latest NPPES snapshot, NPI 1043219967 is active (record last updated 2026-04-20).

How do I verify Mark Greenberg's NPI record?

Cross-check NPI 1043219967 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-20.