Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marilyn M C Lacrosse, M.D.

Family Medicine Physician in Crystal Lake, IL · enumerated 2006.

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

National Provider Identifier

1255376885

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Registry record

Entity type Individual (Type 1)

Name Marilyn M C Lacrosse

Credential M.D.

Sex Female

Practice address 360 Station Dr, Crystal Lake, IL, 60014

Phone (815) 338-6600

Fax (847) 802-7112

Enumeration date Jun 18, 2006

Last updated in NPPES Jun 7, 2018

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 44165-020 (WI) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 036119800 (IL) Secondary

2080A0000X Pediatric Adolescent Medicine Physician Allopathic & Osteopathic Physicians · License 036-119800 (IL) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 036119800 (IL) 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
34182500	Medicaid	WI	-
930116115	Other	WI	MEDICARE RAILROAD
036119800	Other	IL	STATE LICENSE
P00226727	Other	WI	MEDICARE RAILROAD
930123614	Other	WI	MEDICARE RAILROAD

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

Where does Marilyn Lacrosse practice?

The practice location on file with NPPES is in Crystal Lake, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Marilyn Lacrosse?

The National Provider Identifier (NPI) for Marilyn Lacrosse is 1255376885, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-07.