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ARI KATZ M.D.
NPI 1902290828
Internal Medicine in Walnut Creek, CA

Active since March 28, 2015PECOS Enrolled
94.1/100
CMS Quality Rating
1535 TREAT BLVD, WALNUT CREEK, CA 94598(925) 296-9228(925) 296-9227 Get Directions Write a Review

NPPES record last updated: December 8, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Dec 8, 2025, Sep 5, 2024, Jan 10, 2023 and 2 more (5 updates tracked since 2018).

About Ari Katz M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ARI KATZ M.D. (NPI 1902290828) is an individual internal medicine provider in Walnut Creek, California, licensed in Illinois (036146174) and active in the NPI registry since March 2015. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1902290828
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameARI KATZCredential: M.D.
Location Address1535 TREAT BLVDWalnut Creek, CA 94598-1043
Mailing Address1535 Treat BlvdWalnut Creek, CA 94598-1043 · (925) 296-9228 · Fax (925) 296-9227
Phone(925) 296-9228
Fax(925) 296-9227
Sole ProprietorNo
Enumeration DateMarch 28, 2015
Last NPPES UpdateDecember 8, 20255 updates tracked since enumeration
NPPES CertifiedDecember 8, 2025
✔ NPI 1902290828 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in IL · 036146174
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedHospitalistTaxonomy 208M00000X · License 036146174 (IL)
1535 TREAT BLVD, Walnut Creek, CA 94598
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ari Katz M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
303 services134 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
146 services130 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
117 services117 patients
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677
The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.
36 services36 patients
Administration of pneumococcal vaccine G0009
The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.
34 services34 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
33 services32 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94598 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.1/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality82.59
Promoting Interoperability100
Improvement Activities40

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
3 suppliers14 claims14 services$13.62 avg. paid by Medicare
Nebulizer, with compressor E0570
DME-Other DME · category DE000N
1 supplier11 claims11 services$3.41 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
3 suppliers14 claims14 services$63.12 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. BARRY L ROTMAN MD
Internal Medicine
1535 TREAT BLVD
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-9228
BARRY ROTMAN MD INC
Internal Medicine
1535 TREAT BLVD
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-9228
DR. WAHEEDA HILLER MD
Internal Medicine
1535 TREAT BLVD
WALNUT CREEK, CA 94598
Contra Costa County (925) 296-9228

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ari Katz's NPI number?

The NPI number for Ari Katz is 1902290828. It was assigned to this individual provider in the NPPES registry on March 28, 2015.

Where is Ari Katz located?

Ari Katz practices at 1535 Treat Blvd, Walnut Creek, CA 94598. The listed phone number is (925) 296-9228.

What is Ari Katz's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Ari Katz enrolled in Medicare?

Yes. Ari Katz is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ari Katz was last updated on December 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.