Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Carol A Landon, ARNP

Family Nurse Practitioner in Merrimack, NH · enumerated 2006.

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

National Provider Identifier

1639103229

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Registry record

Entity type Individual (Type 1)

Name Carol A Landon

Credential ARNP

Sex Female

Practice address 454 Daniel Webster Hwy, Merrimack, NH, 03054

Phone (603) 424-8120

Fax (603) 424-8140

Enumeration date Jul 10, 2006

Last updated in NPPES Mar 7, 2023

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0246942303 (NH) Primary

Other identifiers

Identifier	Type	State	Issuer
30D0084963	Other	NH	CLIA ID #
50Y095600NH01	Other	NH	BC/BS GROUP ID #
020451281	Other	-	TAX ID #
23YP02407NH01	Other	NH	BC/BS IPN
0246942303	Other	NH	BON LIC #

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 1639103229 active?

Yes, as of the latest NPPES snapshot, NPI 1639103229 is active (record last updated 2023-03-07).

How do I verify Carol Landon's NPI record?

Cross-check NPI 1639103229 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Mark Timmerman Family Medicine Physician · Merrimack, NH NPI 1972525574

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.