NPI registry status
Active
2026 NPPES data Allergy Physician NPI 1093711830 M.D.
Verify on CMS → David Katzen, M.D.
Allergy Physician in Warwick, Rhode Island.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,015 in Allergy 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
1K
Medicare Part D claims · 236 beneficiaries · Allergy Physician avg: 805
Industry payments
$710.58
34 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
David Katzen, M.D. filed 1,369 Medicare Part D claims in 2024 as an Allergy Physician in Warwick, Rhode Island.
- 1K
- Part D claims, 2024
- $710.58
- industry payments (Sunshine Act)
- ≥79th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about David Katzen, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1093711830), first enumerated 06/27/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,369 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Reported
Industry payment transparency
$710.58 in reported industry payments (34 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1093711830 · Allergy Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1093711830
- ENUM-LEGACY 2005
- TAX-NARROW 1,015
- RX-MID 1,369
- BOOK-THIN 6 in Rhode Island
- PHOTO-ENUM Eun Young Kim, M.D. · 2005
David Katzen, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,369 ≥ 79th percentile 79% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
◑
Board-eligible specialty (heuristic, not verified)
David Katzen, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about David Katzen, M.D.?
Quality data not reportedPrimary specialty
Allergy Physician
Medicare Part D claims
1,369 70% vs specialty avg
Specialty distribution in Rhode Island
How Allergy Physician compares to other specialties among Rhode Island providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Allergy Physician. Verify directly:
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).
Practice Address
Provider Details
| NPI | 1093711830 |
|---|---|
| Specialty | Allergy Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/27/2005 |
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 David Katzen, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$711
Largest payer
GlaxoSmithKline, LLC.
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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
1,369
Total Claims
$317K
Total Drug Cost
236
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,230.467
- Total Day Supply
- 63,708
- Generic Drug Cost
- $28K
- Antibiotic Claims
- 15
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 0.88
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 40, 65-74: 123, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What David Katzen, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Fluticasone Propio…
Fluticasone Propionate
227 claims
- Montelukast Sodium
Montelukast Sodium
199 claims
- Azelastine Hcl
Azelastine Hcl
120 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
92 claims
- Trelegy Ellipta 79
Trelegy Ellipta
79 claims
- Ipratropium Bromide 52
Ipratropium Bromide
52 claims
- Ventolin Hfa 49
Ventolin Hfa
49 claims
- Prednisone 47
Prednisone
47 claims
| Drug | Claims |
|---|---|
| Fluticasone Propionate | 227 |
| Montelukast Sodium | 199 |
| Azelastine Hcl | 120 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 92 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 79 |
| Ipratropium Bromide | 52 |
| Ventolin Hfa Albuterol Sulfate | 49 |
| Prednisone | 47 |
| Epinephrine | 44 |
| Breo Ellipta Fluticasone/Vilanterol | 43 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy Physician Overview
How David Katzen, M.D. fits within the Allergy Physician landscape nationally.
1,015
Allergy Physician Providers in US
50
States with Allergy Physician
805
Avg Claims per Provider
David Katzen, M.D.'s 1,369 claims are above the specialty average of 805.
Nationwide Allergy Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Katzen, both outside Rhode Island so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Allergy Physician Providers in Rhode Island
Other clinicians with the same primary specialty enrolled in Rhode Island, drawn from the same CMS NPPES roster as Katzen.
One of 6 Allergy Physician providers enrolled in Rhode Island, 5 are shown here.
Dr. Stanley Block
MD
Providence, RI
Dr. Mansi James
DO
Providence, RI
Dr. Mary Ann Passero
M.D.
Providence, RI
Dr. Anthony Ricci
M.D.
East Greenwich, RI
Dr. John Zwetchkenbaum
M.D.
Providence, RI
Compare Allergy Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is David Katzen, M.D.'s specialty? ▼
David Katzen, M.D. specializes in Allergy Physician and practices in Warwick, Rhode Island. Credentials: M.D..
How much does David Katzen, M.D. prescribe under Medicare Part D? ▼
In 2024, David Katzen, M.D. wrote 1,369 Medicare Part D claims totaling $317K in drug costs for 236 beneficiaries.
Where is David Katzen, M.D. located? ▼
David Katzen, M.D. is located at 400 BALD HILL RD, Warwick, RI, 02886. Phone: (401) 739-5901.
What is David Katzen, M.D.'s NPI number? ▼
David Katzen, M.D.'s National Provider Identifier (NPI) is 1093711830, issued on 06/27/2005.
How many Allergy Physician providers are there in the US? ▼
There are 1,015 Allergy Physician providers across 50 states in the US. The average Allergy Physician provider writes 805 Medicare Part D claims per year.
What drugs does David Katzen, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, David Katzen, M.D.'s most frequently prescribed drugs include Fluticasone Propionate, Montelukast Sodium, Azelastine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Katzen, M.D. accept Medicare? ▼
David Katzen, M.D. appears in CMS Medicare data with 1,369 Part D claims and 236 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Katzen, M.D.'s credentials? ▼
David Katzen, M.D.'s NPI is 1093711830 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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- 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 August 2026 (NPPES) / 2024 (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 August 2026.