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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

KAREN MARHOFFER MSN, APRN, FNP
NPI 1194512178
Nurse Practitioner - Family in Northridge, CA

Active since April 22, 2025
19871 NORDHOFF ST, NORTHRIDGE, CA 91324(818) 359-8833 Get Directions Write a Review

NPPES record last updated: August 4, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 4, 2026, May 1, 2026 (2 updates tracked since 2026).

About Karen Marhoffer Msn, Aprn, Fnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

KAREN MARHOFFER MSN, APRN, FNP (NPI 1194512178) is an individual family provider in Northridge, California, licensed in California (95026455) and active in the NPI registry since April 2025.

NPPES Registry Identity

NPI1194512178
Entity TypeIndividual
Primary Taxonomy363LF0000X
Provider Legal NameKAREN MARHOFFERCredential: MSN, APRN, FNP
Location Address19871 NORDHOFF STNorthridge, CA 91324-3331
Mailing Address12215 Victory BlvdNorth Hollywood, CA 91606-3206
Phone(818) 359-8833
Sole ProprietorYes
Enumeration DateApril 22, 2025
Last NPPES UpdateAugust 4, 20262 updates tracked since enumeration
NPPES CertifiedAugust 4, 2026
✔ NPI 1194512178 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in CA · 95026455
19871 NORDHOFF ST, Northridge, CA 91324
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Other Providers at the Same Location NPPES 10

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KIUMARS ARFAI, M.D. INC.
Clinic/Center (Radiology)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 349-5050
NORTHRIDGE OUTPATIENT SURGERY CENTER INC
Clinic/Center (Ambulatory Surgical)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 349-5050
MISSION HILLS PAIN MANAGEMENT MEDICAL CORPORATION
Clinic/Center (Pain)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 359-8833
KIUMARS ARFAI, M.D., INC.
Clinic/Center (Pain)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 349-5050
DR. DIDIER MASCARADE D.C.
Chiropractor (Internist)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 601-7909
DR. PARIZAD HOOSHI M.D.
Radiology (Diagnostic Radiology)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 349-5050
MRS. STEPHANIE HELEN BARRERA RN
Registered Nurse
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 359-8833
KIUMARS ARFAI, M.D., INC.
Clinic/Center (Urgent Care)
19871 NORDHOFF ST
NORTHRIDGE, CA 91324
Los Angeles County (818) 349-5050

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Karen Marhoffer's NPI number?

The NPI number for Karen Marhoffer is 1194512178. It was assigned to this individual provider in the NPPES registry on April 22, 2025.

Where is Karen Marhoffer located?

Karen Marhoffer practices at 19871 Nordhoff St, Northridge, CA 91324. The listed phone number is (818) 359-8833.

What is Karen Marhoffer's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

When was this NPI record last updated?

The NPPES record for Karen Marhoffer was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.