Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Margaret Mary Mertens, D.C.

Rehabilitation Chiropractor in Marshfield, WI · enumerated 2007 · practices at J-1 Enterprises LLC.

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

National Provider Identifier

1225253628

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Registry record

Entity type Individual (Type 1)

Name Dr. Margaret Mary Mertens

Credential D.C.

Sex Female

Practice address 106 S Chestnut Ave, Marshfield, WI, 54449

Phone (715) 384-9064

Fax (715) 387-6954

Enumeration date Apr 13, 2007

Last updated in NPPES May 24, 2019

Taxonomy & licenses

111NR0400X Rehabilitation Chiropractor Chiropractic Providers · License 2195-012 (WI) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Other identifiers

Identifier	Type	State	Issuer
200415291	Other	WI	TAX ID

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

How do I verify Margaret Mertens's NPI record?

Cross-check NPI 1225253628 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1225253628 active?

Yes, as of the latest NPPES snapshot, NPI 1225253628 is active (record last updated 2019-05-24).

Other providers at this practice address

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Will Schlinsog Chiropractor · Marshfield, WI NPI 1750540019 J-1 Enterprises LLC Health Service Clinic/Center · Marshfield, WI NPI 1427218379

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-05-24.