Ariel Marks, M.D
Emergency Medicine Physician · Redwood City, CA
Ariel Marks, M.D is an emergency medicine physician with a practice address in Redwood City, California, and NPI 1568552438, issued on Oct 13, 2006. Check the license (California A54588, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ariel Marks
- Credential
- M.D
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A54588 CA
Self-reported in NPPES; status is on the state search - Practice location
- 170 Alameda DE Las Pulgas, Redwood City, CA 94062
- Phone
- (650) 367-5541
- Enumerated
- Oct 13, 2006
- Record last updated
- Oct 10, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080501000615); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 1994
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 170 Alameda DE Las Pulgas
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah AbuseifHospitalist Physician1801281795
- David Adams, M.DEmergency Medicine Physician1891735643
- Michele AdkissonPerfusionist1831321447
- Jyothi Adsumilli, M.D.,Hospitalist Physician1245508159
- Ari AuwinitzkyPerfusionist1629585583
- Marjorie Berry Simon, LCSWClinical Social Worker1639477532
Verify Ariel Marks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A54588Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average emergency medicine physician in 2024
504 Medicare Part D claims for 322 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 82 claims were for opioids.
Most prescribed
- Prednisone73 claims
- Hydrocodone-Acetaminophen68 claims
- Ibuprofen66 claims
- Ondansetron Odt42 claims
- Ciprofloxacin Hcl39 claims
- Albuterol Sulfate Hfa28 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cep America - CaliforniaRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ariel Marks among 7,751 emergency medicine physician records in California
Ariel Marks, M.D is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1994 · median 2011 among the 4,560 with a school on file
- Record last updated2019 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Redwood City → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- David Adams, M.DRedwood City, CA 940621891735643
- Sean Bourke, M.DRedwood City, CA 940621013964311
- Gary Macgregor, M.D.Redwood City, CA 940621912019555
- John Meharg, M.DRedwood City, CA 940621700826559
- George Oldham, M.DRedwood City, CA 940621336189182
- Alex Walsh, DORedwood City, CA 940621851956833
- James Ahn, MDRedwood City, CA 940631528146180
- George Bulloch, MDRedwood City, CA 940631134207723
Common questions
What is Ariel Marks, M.D's NPI number?
Ariel Marks, M.D's National Provider Identifier (NPI) is 1568552438, issued on Oct 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ariel Marks, M.D located?
The NPPES record lists a practice address at 170 Alameda DE Las Pulgas, Redwood City, CA, 94062. Phone: (650) 367-5541. Providers update this record themselves, so call before visiting.
How can I verify Ariel Marks, M.D's license?
NPPES lists California license number A54588, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ariel Marks, M.D prescribe under Medicare Part D?
In 2024, Ariel Marks, M.D had 504 Medicare Part D claims for 322 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Ariel Marks, M.D's MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.