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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.

DR. HAROLD MARKS MD
NPI 1568422822
Surgery in Northridge, CA

Active since March 23, 2006
18350 ROSCOE BLVD, SUITE 505, NORTHRIDGE, CA 91325(818) 886-3400(818) 886-3402 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Harold Marks Md NPPES

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

DR. HAROLD MARKS MD (NPI 1568422822) is an individual surgery provider in Northridge, California, licensed in California (G47893) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1568422822
Entity TypeIndividualMale
Primary Taxonomy208600000X
Provider Legal NameDR. HAROLD MARKSCredential: MD
Location Address18350 ROSCOE BLVD, SUITE 505Northridge, CA 91325-4109
Mailing Address18350 Roscoe Blvd Suite 505Northridge, CA 91325 · (818) 886-3400 · Fax (818) 886-3402
Phone(818) 886-3400
Fax(818) 886-3402
Sole ProprietorNo
Enumeration DateMarch 23, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1568422822 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in CA · G47893
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
18350 ROSCOE BLVD, Northridge, CA 91325
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Other Providers at the Same Location NPPES 20

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

DR. ANDREW CHANG M.D.
Ophthalmology
18350 ROSCOE BLVD, SUITE 101
NORTHRIDGE, CA 91325
Los Angeles County (818) 349-8300
NORTHRIDGE FACIAL PLASTIC SURGERY MEDICAL GROUP A PROFESSIONAL CORP
Clinic/Center (Ambulatory Surgical)
18350 ROSCOE BLVD, #318A
NORTHRIDGE, CA 91325
Los Angeles County (818) 993-9824
DR. FARES RABADI M.D.
Internal Medicine
18350 ROSCOE BLVD, SUITE 514
NORTHRIDGE, CA 91325
Los Angeles County (818) 775-0519
SASIPAN JETAWATANA
Pharmacist
18350 ROSCOE BLVD
NORTHRIDGE, CA 91325
Los Angeles County (818) 688-5772
DR. RITOO GAGNEJA M.D.
Family Medicine
18350 ROSCOE BLVD, SUITE 600
NORTHRIDGE, CA 91325
Los Angeles County (818) 727-1515
FAMILY MEDICINE ASSOCIATES OF NORTHRIDGE A MEDICAL GROUP INC
Family Medicine
18350 ROSCOE BLVD, SUITE 600
NORTHRIDGE, CA 91325
Los Angeles County (818) 727-1515
JAMES CHRISTOPHER ANDREWS M.D.
Otolaryngology (Otology & Neurotology)
18350 ROSCOE BLVD, SUITE 518
NORTHRIDGE, CA 91325
Los Angeles County (818) 349-0680
DR. ADEL F. JABOUR M.D.
Surgery
18350 ROSCOE BLVD, SUITE #200
NORTHRIDGE, CA 91325
Los Angeles County (818) 885-7905

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 Harold Marks's NPI number?

The NPI number for Harold Marks is 1568422822. It was assigned to this individual provider in the NPPES registry on March 23, 2006.

Where is Harold Marks located?

Harold Marks practices at 18350 Roscoe Blvd Suite 505, Northridge, CA 91325. The listed phone number is (818) 886-3400.

What is Harold Marks's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

When was this NPI record last updated?

The NPPES record for Harold Marks was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 42 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.