Dr. Harold Marks , MD
Surgery • Northridge, CA
18350 Roscoe Blvd, Suite 505
Northridge, CA 913254109
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on March 23, 2006; this date does not establish years in practice.
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Published CMS data list 20 Medicare Part D prescriptions, including refills, in 2015.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015. Published rows only; this is not a quality measure.
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Published Part D records, 2015:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 20 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 56 in 2013 to 20 in 2015.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2013–2015.
Practice Location & Contact Primary Location
18350 Roscoe Blvd
Suite 505
Northridge, CA 913254109
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
20 standardized 30-day fills in 2015
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$220 in 2015
The total cost of these prescriptions in 2015, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Northridge and California
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Marks are from 2015.
6 active clinicians are listed under Surgery with a practice address in Northridge, CA (3,120 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 64% from 56 in 2013 to 20 in 2015.
- 2013: 56
- 2014: 68
- 2015: 20
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30-day fills
30-day fills decreased 64% from 56 in 2013 to 20 in 2015.
- 2013: 56
- 2014: 68
- 2015: 20
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Part D drug cost
Part D drug cost went from $434 in 2013 to $220 in 2015.
- 2013: $434
- 2014: $498
- 2015: $220
Sources: CMS Medicare Part D Prescribers (2015), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2015.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 20 | 103 | $219.75 | 19 |
Source: CMS Part D by Provider and Drug, 2015; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208600000X
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.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Obstetrics & Gynecology
Doctor of Medicine (M.D.)
Otolaryngology - Otology & Neurotology
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Specialist
Doctor of Medicine (M.D.)
Specialist
Doctor of Medicine (M.D.)
Ophthalmology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated March 23, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Surgery Specialists in Northridge
- Dr. Adel Jabour, MD
- Dr. Norair Adjamian, DO
- Dr. Uthaiah Kokkalera, MD
- Dr. Walid Arnaout, MD
- Dr. Charles Chidsey, MD
Mailing Address
18350 Roscoe Blvd Suite 505
Northridge, CA 91325
Phone: 8188863400