NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1124088430 MD
Verify on CMS → Ronald Mason, MD
Gastroenterology Physician in Kirkland, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 17,061 in Gastroenterology 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 · 281 beneficiaries · Gastroenterology Physician avg: 848
MIPS score
80/100
▼ 4 pts below national avg 83.5 · Above neutral
Industry payments
$772.94
31 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Ronald Mason, MD reported a CMS MIPS final score of 80/100 - below the 83.5 national average - and filed 1,161 Medicare Part D claims in 2024.
- 80/100
- MIPS score · -4 vs avg
- 1K
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥26th
- pct among measured MIPS (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 Ronald Mason, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1124088430), first enumerated 03/23/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,161 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 80/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$772.94 in reported industry payments (31 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Washington statewide board action statistics are published annually — these figures describe aggregate state activity, not Ronald Mason, MD's individual license status. Verify directly with the state medical board.
Source: WMC annual report 2023
- 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 1124088430 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-BELOW · RX-MID · BOOK-THIN · PHOTO-FINISH
- NPI-10 1124088430
- ENUM-LEGACY 2006
- TAX-MID 17K Gastroenterology Physician
- MIPS-BELOW 80/100
- RX-MID 1,161
- BOOK-THIN 448 in Washington
- PHOTO-FINISH Ameena Anees · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Girish Anand · l…
Girish Anand
79.9 MIPS pts
- Mason · this pro…
Mason · this provider
80 MIPS pts
- Garth George · n…
Garth George
80 MIPS pts
- Ameena Anees · n…
Ameena Anees
80 MIPS pts
- Nicolas Patel · …
Nicolas Patel
80.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Ronald Mason, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
80 ≥ 26th percentile 26% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Ronald Mason, MD sits
This provider among gastroenterology physician peers
Across the 5,560 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Ronald Mason, MD writes more Part D claims than 70% of them and scores higher on MIPS quality than 33% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one gastroenterology physician peer from a representative sample of 60; the gold marker is Ronald Mason, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Ronald Mason, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - 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 Ronald Mason, MD?
Near national averagePrimary specialty
Gastroenterology Physician
Medicare Part D claims
1,161 37% vs specialty avg
MIPS final score
80/100 3.5 pts vs avg
Specialty distribution in Washington
How Gastroenterology Physician compares to other specialties among Washington providers
Medicare quality performance, MIPS
Ronald Mason, MD's 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 80/100
- vs 83.5 national avg · 2023 performance year
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 | 1124088430 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/23/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
79.9742
Final Score
Measured-score avg: 83.5
69.6772
Quality
63.5703
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Ronald Mason, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Puget Sound Gastroenterology PLLC
Kirkland, WA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Ronald Mason, MD. Source: openpaymentsdata.cms.gov.
Total received
$773
Largest payer
ABBVIE INC.
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 - Washington WMC 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 ~34K Washington medical licensees in 2023 - they are NOT specific to Ronald Mason, MD. To verify Ronald Mason, MD's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC 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 Washington 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 2024.
1,161
Total Claims
$417K
Total Drug Cost
281
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,821.367
- Total Day Supply
- 50,994
- Generic Drug Cost
- $46K
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 1.13
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 11, 65-74: 138, 75-84: 107, 85+: 25
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ronald Mason, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Pantoprazole Sodium
Pantoprazole Sodium
442 claims
- Famotidine 82
Famotidine
82 claims
- Omeprazole 78
Omeprazole
78 claims
- Sod Sulf-Potass Su… 55
Sod Sulf-Potass Sulf-Mag Sulf
55 claims
- Colesevelam Hcl 35
Colesevelam Hcl
35 claims
- Mesalamine 34
Mesalamine
34 claims
- Ursodiol 33
Ursodiol
33 claims
- Ondansetron Odt 22
Ondansetron Odt
22 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 442 |
| Famotidine | 82 |
| Omeprazole | 78 |
| Sod Sulf-Potass Sulf-Mag Sulf Sodium, Potassium,mag Sulfates | 55 |
| Colesevelam Hcl | 35 |
| Mesalamine | 34 |
| Ursodiol | 33 |
| Ondansetron Odt Ondansetron | 22 |
| Dicyclomine Hcl | 21 |
| Dexlansoprazole Dr Dexlansoprazole | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Ronald Mason, MD fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Ronald Mason, MD's 1,161 claims are above the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Mason, both outside Washington so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (80 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Mason.
One of 448 Gastroenterology Physician providers enrolled in Washington, 5 are shown here.
Abimbola Adike
Poulsbo, WA
Dr. Abhishek Agarwal
MD
Puyallup, WA
Dr. Gaurav Aggarwal
M.D.
Bellevue, WA
Dr. Sanjay Agrawal
M.D.
Tacoma, WA
Dr. Ehsaan Akhtar
MD
Kirkland, WA
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ronald Mason, MD's specialty? ▼
Ronald Mason, MD specializes in Gastroenterology Physician and practices in Kirkland, Washington. Credentials: MD.
How much does Ronald Mason, MD prescribe under Medicare Part D? ▼
In 2024, Ronald Mason, MD wrote 1,161 Medicare Part D claims totaling $417K in drug costs for 281 beneficiaries.
What is Ronald Mason, MD's Medicare quality score? ▼
Ronald Mason, MD has a CMS MIPS Final Score of 80/100 (Quality: 69.7, Cost: 63.6). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Ronald Mason, MD located? ▼
Ronald Mason, MD is located at 11800 NE 128TH ST, Kirkland, WA, 98034. Phone: (425) 899-4500.
What is Ronald Mason, MD's NPI number? ▼
Ronald Mason, MD's National Provider Identifier (NPI) is 1124088430, issued on 03/23/2006.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Ronald Mason, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Ronald Mason, MD's most frequently prescribed drugs include Pantoprazole Sodium, Famotidine, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ronald Mason, MD accept Medicare? ▼
Ronald Mason, MD appears in CMS Medicare data with 1,161 Part D claims and 281 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ronald Mason, MD's credentials? ▼
Ronald Mason, MD's NPI is 1124088430 with credentials MD. 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.
- 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 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.