Ariel Marks, M.D
NPI 1568552438 · Emergency Medicine Physician · Redwood City, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ariel Marks, M.D is a Emergency Medicine Physician provider in Redwood City, CA (NPI 1568552438).
Provider details
- NPI number
- 1568552438
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- A54588 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,782 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 511 | $9 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 454 | $194 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 298 | $134 |
| X-Ray of Chest, 1 View71045 | 297 | $10 |
| Critical Care, First 30-74 Minutes99291 | 101 | $242 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 28 | $79 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 73 | 70 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 68 | 67 |
| Ibuprofen | 66 | 66 |
| Ondansetronbrand: Ondansetron Odt | 42 | 42 |
| Ciprofloxacin Hcl | 39 | 38 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 28 | 26 |
| Cephalexin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-13
- Last updated
- 2019-10-10
Frequently asked questions
- What is Ariel Marks's NPI number?
- Ariel Marks's National Provider Identifier (NPI) is 1568552438, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ariel Marks's specialty?
- Ariel Marks is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ariel Marks located?
- Ariel Marks's practice location on file with NPPES is 170 Alameda De Las Pulgas, Redwood City, CA 94062-2751.
- What is Ariel Marks's phone number?
- The practice phone number listed in the NPPES registry for Ariel Marks is (650) 367-5541.
- Does Ariel Marks accept Medicare?
- Ariel Marks is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ariel Marks's NPI active?
- Yes — Ariel Marks's NPI (1568552438) is active in the NPPES registry as of the last update on 2019-10-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.