Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gretchen L Tolsma, APNP
Nurse Practitioner in Antigo, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1538167077
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Registry record
Entity type Individual (Type 1)
Name Gretchen L Tolsma
Credential APNP
Sex Female
Practice address 2327 Neva Rd, Antigo, WI, 54409
Phone (715) 623-2123
Fax (715) 623-6556
Enumeration date Jul 8, 2005
Last updated in NPPES May 1, 2014
Taxonomy & licenses
363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 1399 (WI) Secondary
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 1399-033 (WI) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 43895600 | Medicaid | WV | - |
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
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 Gretchen Tolsma?
Gretchen Tolsma is registered in NPPES with the primary taxonomy of Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-05-01.