Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mathew Greenston, MD

Emergency Medicine Physician in Manchester, NH · enumerated 2006.

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

National Provider Identifier

1558464370

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Registry record

Entity type Individual (Type 1)

Name Dr. Mathew Greenston

Credential MD

Sex Male

Practice address 100 Mcgregor St, Cmc - Emergency Department, Manchester, NH, 03102

Phone (603) 663-6478

Fax (603) 926-2853

Enumeration date Sep 7, 2006

Last updated in NPPES Oct 27, 2010

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 11246 (NH) 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
30206501	Medicaid	NH	-
4129232	Other	-	MVP
2130700	Medicaid	MA	-
000000042678	Other	-	BMC HEALTHNET PLAN
AA79987	Other	-	HARVARD PILGRIM
01Y003100NH03	Other	NH	ANTHEM
434911199	Medicaid	ME	-
P00384959	Other	-	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.

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Frequently asked questions

How do I verify Mathew Greenston's NPI record?

Cross-check NPI 1558464370 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558464370 active?

Yes, as of the latest NPPES snapshot, NPI 1558464370 is active (record last updated 2010-10-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-10-27.