Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Mary G. Heitschmidt, RN,APN

Clinical Nurse Specialist in Chicago, IL · enumerated 2007.

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

National Provider Identifier

1861612269

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Registry record

Entity type Individual (Type 1)

Name Ms. Mary G. Heitschmidt

Credential RN,APN

Sex Female

Practice address 5841 South Maryland, Chicago, IL, 60638

Phone (773) 702-1000

Enumeration date Apr 26, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

364S00000X Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN credential

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

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 Mary Heitschmidt?

Mary Heitschmidt is registered in NPPES with the primary taxonomy of Clinical Nurse Specialist. 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 2007-07-08.