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Harold Marks, MD
NPI 1568422822 · Surgery Physician · Northridge, CA
Harold Marks, MD is a Surgery Physician provider in Northridge, CA (NPI 1568422822).
Provider details
- NPI number
- 1568422822
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G47893 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
18350 Roscoe Blvd
Suite 505
Northridge, CA 91325-4109
Phone: (818) 886-3400
Fax: (818) 886-3402
Street-level locationGet directions
Mailing address
18350 Roscoe Blvd Suite 505
Northridge, CA 91325
Registry dates
- Enumerated
- 2006-03-23
- Last updated
- 2007-07-08
Frequently asked questions
- What is Harold Marks's NPI number?
- Harold Marks's National Provider Identifier (NPI) is 1568422822, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Harold Marks's specialty?
- Harold Marks is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Harold Marks located?
- Harold Marks's practice location on file with NPPES is 18350 Roscoe Blvd, Northridge, CA 91325-4109.
- What is Harold Marks's phone number?
- The practice phone number listed in the NPPES registry for Harold Marks is (818) 886-3400.
- Is Harold Marks's NPI active?
- Yes — Harold Marks's NPI (1568422822) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.