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

Dr. Marilyn S Lyons, DMD, MMS

Endodontics in Londonderry, NH · enumerated 2006.

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

National Provider Identifier

1104869809

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Registry record

Entity type Individual (Type 1)

Name Dr. Marilyn S Lyons

Credential DMD, MMS

Sex Female

Practice address Londonderry, NH, 03053

Phone (603) 425-2307

Fax (603) 437-8190

Enumeration date Jun 13, 2006

Last updated in NPPES Apr 27, 2015

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

Taxonomy & licenses

1223E0200X Endodontics Dental Providers · License 1844 (NH) Primary

1223E0200X Endodontics Dental Providers · License 13970 (MA) Secondary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential

Other identifiers

Identifier	Type	State	Issuer
X12135	Other	MA	BC/BS OF MA PROVIDER #
X12134	Other	NH	BC/BS OF MA PROVIDER #

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Marilyn Lyons?

Marilyn Lyons is registered in NPPES with the primary taxonomy of Endodontics. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-04-27.