NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1902290828 M.D.
Verify on CMS → Ari Katz, M.D.
Hospitalist Physician in Walnut Creek, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,938 in Hospitalist Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
685
Medicare Part D claims · 107 beneficiaries · Hospitalist Physician avg: 888
MIPS score
94.1/100
▲ 11 pts above national avg 83.1 · Exceptional
Industry payments
$382.41
8 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Ari Katz, M.D. reported a CMS MIPS final score of 94.1/100 - above the 83.1 national average - and filed 685 Medicare Part D claims in 2023.
- 94.1/100
- MIPS score · +11 vs avg
- 685
- Part D claims, 2023
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Ari Katz, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
94 Top 25% higher than 75% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Ari Katz, M.D. sits
This provider among hospitalist physician peers
Across the 4,437 hospitalist physician providers who report both Medicare Part D prescribing and a MIPS quality score, Ari Katz, M.D. writes more Part D claims than 85% of them and scores higher on MIPS quality than 68% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one hospitalist physician peer from a representative sample of 60; the gold marker is Ari Katz, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Ari Katz, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ari Katz, M.D.?
High performer (top quartile)Primary specialty
Hospitalist Physician
Medicare Part D claims
685 23% vs specialty avg
MIPS final score
94.1/100 11 pts vs avg
Specialty distribution in California
How Hospitalist Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Ari Katz, M.D.'s 2023 MIPS final score plotted against the Hospitalist Physician national average
- MIPS Final Score
- 94.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hospitalist Physician) - 94.1/100 vs national avg 83.1
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Ari Katz, M.D. appears in the CMS NPPES registry as a Hospitalist Physician provider holding M.D. credentials at 1535 TREAT BLVD, Walnut Creek, CA, 94598, with a listed phone of (925) 296-9228. NPI 1902290828 was issued on 03/28/2015.
Medicare Part D records for calendar year 2023 show 685 prescription claims written by this provider, covering 107 Medicare beneficiaries and totaling roughly $89K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 94.1/100 for the 2023 performance year (Quality 82.6), compared with the national average of 83.1.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,938 enrolled providers across 54 states and an average of 888 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1902290828 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/28/2015 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.1036
Final Score
Avg: 83.1
82.5938
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Ari Katz, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$382
Largest payer
Edwards Lifesciences Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Ari Katz, M.D.. To verify Ari Katz, M.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
685
Total Claims
$89K
Total Drug Cost
107
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,589
- Total Day Supply
- 45,559
- Generic Drug Cost
- $17K
- Antibiotic Claims
- 27
Patient Demographics
- Average Patient Age
- 76.3 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 0, 65-74: 45, 75-84: 44, 85+: 18
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ari Katz, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
64 claims
- Amlodipine Besylate
Amlodipine Besylate
44 claims
- Rosuvastatin Calcium 23
Rosuvastatin Calcium
23 claims
- Losartan Potassium 20
Losartan Potassium
20 claims
- Sertraline Hcl 20
Sertraline Hcl
20 claims
- Trazodone Hcl 18
Trazodone Hcl
18 claims
- Metoprolol Succinate 15
Metoprolol Succinate
15 claims
- Synthroid 14
Synthroid
14 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 64 |
| Amlodipine Besylate | 44 |
| Rosuvastatin Calcium | 23 |
| Losartan Potassium | 20 |
| Sertraline Hcl | 20 |
| Trazodone Hcl | 18 |
| Metoprolol Succinate | 15 |
| Synthroid Levothyroxine Sodium | 14 |
| Allopurinol | 12 |
| Escitalopram Oxalate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How Ari Katz, M.D. fits within the Hospitalist Physician landscape nationally.
16,938
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
Ari Katz, M.D.'s 685 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Katz.
Dr. Zina Abbas
M.D.
Chula Vista, CA
Dr. Mehrdad Abbasi
MD
Rancho Mirage, CA
Dr. Abdul Abdali
M.D.
French Camp, CA
Dr. Anwar Abdelhadi
M.D.
Orange, CA
Dr. Farid Abdelmalak
M.D.
Santa Monica, CA
Compare Hospitalist Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Ari Katz, M.D.'s specialty? ▼
Ari Katz, M.D. specializes in Hospitalist Physician and practices in Walnut Creek, California. Credentials: M.D..
How much does Ari Katz, M.D. prescribe under Medicare Part D? ▼
In 2023, Ari Katz, M.D. wrote 685 Medicare Part D claims totaling $89K in drug costs for 107 beneficiaries.
What is Ari Katz, M.D.'s Medicare quality score? ▼
Ari Katz, M.D. has a CMS MIPS Final Score of 94.1/100 (Quality: 82.6). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Ari Katz, M.D. located? ▼
Ari Katz, M.D. is located at 1535 TREAT BLVD, Walnut Creek, CA, 94598. Phone: (925) 296-9228.
What is Ari Katz, M.D.'s NPI number? ▼
Ari Katz, M.D.'s National Provider Identifier (NPI) is 1902290828, issued on 03/28/2015.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,938 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does Ari Katz, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ari Katz, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Rosuvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ari Katz, M.D. accept Medicare? ▼
Ari Katz, M.D. appears in CMS Medicare data with 685 Part D claims and 107 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ari Katz, M.D.'s credentials? ▼
Ari Katz, M.D.'s NPI is 1902290828 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.