Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Karen B Callahan, F.N.P.
Nurse Practitioner in Yuba City, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1932124443
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Registry record
Entity type Individual (Type 1)
Name Karen B Callahan
Credential F.N.P.
Sex Female
Practice address 969 Plumas St, Ste 103, Yuba City, CA, 95991
Phone (530) 749-3585
Fax (530) 749-3499
Enumeration date Jul 13, 2006
Last updated in NPPES Mar 29, 2021
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License NPF5796 (CA) Primary
FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan.
About the FNP credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P00785483 | Other | - | RAILROAD MEDICARE |
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 Karen Callahan?
Karen Callahan 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 → Dennis G. Bechini, D.O. PC Obstetrics & Gynecology Physician · Yuba City, CA NPI 1770518250 Bruce Hilger Obstetrics & Gynecology Physician · Yuba City, CA NPI 1689695389 Richard Maddalena Obstetrics & Gynecology Physician · Yuba City, CA NPI 1275540023 Stanley Nowinski Obstetrics & Gynecology Physician · Yuba City, CA NPI 1942311287 Sutter North Medical Foundation Durable Medical Equipment & Medical Supplies · Yuba City, CA NPI 1215073655 Aparna Kareti Obstetrics & Gynecology Physician · Yuba City, CA NPI 1366634180 Maninderjit Atwal Obstetrics & Gynecology Physician · Yuba City, CA NPI 1134380439 Lori Meinking Advanced Practice Midwife · Yuba City, CA NPI 1578897096
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-29.