Ari Katz, M.D.
NPI 1902290828 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Order and Referring Only - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ari Katz, M.D. is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1902290828).
Provider details
- NPI number
- 1902290828
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036146174 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 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
652 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 303 | $30 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 146 | $15 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 117 | $138 |
| Administration of Pneumococcal VaccineG0009 | 34 | $26 |
| Administration of Influenza Virus VaccineG0008 | 33 | $26 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 156 | 46 |
| Amlodipine Besylate | 98 | 34 |
| Rosuvastatin Calcium | 89 | 33 |
| Levothyroxine Sodium | 50 | 15 |
| Omeprazole | 45 | 15 |
| Metoprolol Succinate | 45 | 15 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$382 across 8 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
- 2015-03-28
- Last updated
- 2025-12-08
- Certified
- 2025-12-08
Frequently asked questions
- What is Ari Katz's NPI number?
- Ari Katz's National Provider Identifier (NPI) is 1902290828, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ari Katz's specialty?
- Ari Katz is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ari Katz located?
- Ari Katz's practice location on file with NPPES is 1535 Treat Blvd, Walnut Creek, CA 94598-1043.
- What is Ari Katz's phone number?
- The practice phone number listed in the NPPES registry for Ari Katz is (925) 296-9228.
- Does Ari Katz accept Medicare?
- Ari Katz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ari Katz's NPI active?
- Yes — Ari Katz's NPI (1902290828) is active in the NPPES registry as of the last update on 2025-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.