Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Maria J. Hillmer, APNP
Nurse Practitioner in Grafton, WI · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598188138
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Registry record
Entity type Individual (Type 1)
Name Maria J. Hillmer
Credential APNP
Sex Female
Practice address 1245 Cheyenne Ave, Suite 301, Grafton, WI, 53024
Phone (262) 377-2222
Fax (262) 377-6543
Enumeration date Feb 3, 2014
Last updated in NPPES Feb 18, 2021
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5685-33 (WI) Primary
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.
Frequently asked questions
What is the NPI number for Maria Hillmer?
The National Provider Identifier (NPI) for Maria Hillmer is 1598188138, a Type 1 (individual) record in the CMS NPPES registry.
Where does Maria Hillmer practice?
The practice location on file with NPPES is in Grafton, WI. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Kelly West Endodontics · Grafton, WI NPI 1760582480 West Endodontic Group Endodontics · Grafton, WI NPI 1417284480 Forefront Dermatology, S.C. Dermatology Physician · Grafton, WI NPI 1710287503 Access Community Therapies LLC Professional Counselor · Grafton, WI NPI 1144607169 Megan Dittrich Clinical Social Worker · Grafton, WI NPI 1700696465
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-18.