Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Ann Hollenback, APN

Family Nurse Practitioner in Aurora, IL · enumerated 2007.

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

National Provider Identifier

1841339405

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Registry record

Entity type Individual (Type 1)

Name Mary Ann Hollenback

Credential APN

Sex Female

Practice address 2020 Ogden Ave Ste 400, Aurora, IL, 60504

Phone (630) 692-5563

Fax (630) 692-5564

Enumeration date Feb 6, 2007

Last updated in NPPES Feb 28, 2024

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 277-000554 (IL) Primary

Other identifiers

Identifier	Type	State	Issuer
IL5966	Other	IL	MEDICARE PTAN (GROUP)
IL5966004	Other	IL	MEDICARE PTAN (INDIVIDUAL)

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 Mary Ann Hollenback practice?

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

What is the NPI number for Mary Ann Hollenback?

The National Provider Identifier (NPI) for Mary Ann Hollenback is 1841339405, 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 2024-02-28.