Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary J Hamburg, APNP
Nurse Practitioner in Baraboo, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1841256385
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Registry record
Entity type Individual (Type 1)
Name Mary J Hamburg
Credential APNP
Sex Female
Practice address 1700 Tuttle St, Baraboo, WI, 53913
Phone (608) 355-3800
Fax (608) 355-7001
Enumeration date Apr 25, 2006
Last updated in NPPES Jan 22, 2016
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 1877-033 (WI) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1841256385 | Medicaid | WI | - |
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 NPI 1841256385 active?
Yes, as of the latest NPPES snapshot, NPI 1841256385 is active (record last updated 2016-01-22).
How do I verify Mary Hamburg's NPI record?
Cross-check NPI 1841256385 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-01-22.