Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mariellen Patricia Antman, APN-CNP

Adult Health Nurse Practitioner in Lake Forest, IL · enumerated 2007.

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

National Provider Identifier

1235271941

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Registry record

Entity type Individual (Type 1)

Name Mariellen Patricia Antman

Credential APN-CNP

Sex Female

Practice address 800 N Westmoreland Rd, Suite 205, Lake Forest, IL, 60045

Phone (847) 735-8550

Fax (847) 535-8590

Enumeration date Feb 12, 2007

Last updated in NPPES Oct 13, 2016

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 041202000 (IL) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209005116 (IL) Secondary

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209.005116 (IL) Primary

Other identifiers

Identifier	Type	State	Issuer
IL6304003	Other	IL	MEDICARE PTAN LOC 16
IL6305003	Other	IL	MEDICARE PTAN LOC 15
1720371669	Other	IL	NPI GROUP PRACTICE
P01058711	Other	IL	RRMC PTAN

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 Mariellen Antman?

Mariellen Antman is registered in NPPES with the primary taxonomy of Adult Health Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-13.