Ari Baron, M.D.
NPI 1013086420 · Specialist · San Francisco, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ari Baron, M.D. is a Specialist provider in San Francisco, CA (NPI 1013086420).
Provider details
- NPI number
- 1013086420
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G72619 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,964 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 975 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 917 | $152 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 456 | $175 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 454 | $18 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 297 | $213 |
| Injection of Additional New Drug Or Substance Into Vein96375 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 55 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Darolutamidebrand: Nubeqa | 398 | 50 |
| Apixabanbrand: Eliquis | 164 | 28 |
| Prednisone | 138 | 19 |
| Leuprolide Acetatebrand: Lupron Depot | 133 | 45 |
| Abiraterone Acetate | 113 | 14 |
| Denosumabbrand: Xgeva | 110 | 16 |
| Hydroxyurea | 102 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$49,173 across 116 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-07
- Last updated
- 2007-07-08
Frequently asked questions
- What is Ari Baron's NPI number?
- Ari Baron's National Provider Identifier (NPI) is 1013086420, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ari Baron's specialty?
- Ari Baron is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Ari Baron located?
- Ari Baron's practice location on file with NPPES is 2100 Webster Street Suite 225, San Francisco, CA 94115.
- What is Ari Baron's phone number?
- The practice phone number listed in the NPPES registry for Ari Baron is (415) 923-3012.
- Does Ari Baron accept Medicare?
- Ari Baron is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ari Baron's NPI active?
- Yes — Ari Baron's NPI (1013086420) 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.