NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1619166923 M.D.
Verify on CMS → Matthew Tsushima, M.D.
Gastroenterology Physician in Honolulu, Hawaii.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,567 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
576
Medicare Part D claims · 317 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Matthew Tsushima, M.D. filed 576 Medicare Part D claims in 2023 as a Gastroenterology Physician in Honolulu, Hawaii, prescribing 91% generic.
- 576
- Part D claims, 2023
- 91%
- generic prescribing
- 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.
Matthew Tsushima, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
576 Top 34% higher than 66% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Matthew Tsushima, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Matthew Tsushima, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
576 31% vs specialty avg
Specialty distribution in Hawaii
How Gastroenterology Physician compares to other specialties among Hawaii 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 Gastroenterology 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).
Matthew Tsushima, M.D. appears in the CMS NPPES registry as a Gastroenterology Physician provider holding M.D. credentials at 2828 PAA ST, Honolulu, HI, 96819, with a listed phone of (808) 432-5770. NPI 1619166923 was issued on 10/23/2007.
Medicare Part D records for calendar year 2023 show 576 prescription claims written by this provider, covering 317 Medicare beneficiaries and totaling roughly $188K in drug spend, split 9% brand-name and 91% generic by claim count.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 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 | 1619166923 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/23/2007 |
Hospital and facility affiliations
Facilities where Matthew Tsushima, M.D. 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.
Hawaii Permanente Medical Group Inc
Honolulu, HI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Matthew Tsushima, M.D. - brand share 9.0%
Gastroenterology Physician average
9% brand-name claims vs 91% generic, on 576 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
576
Total Claims
$188K
Total Drug Cost
317
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 956
- Total Day Supply
- 20,703
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $161K
- Generic Drug Cost
- $27K
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 73.0 years
- Avg HCC Risk Score
- 1.21
- Gender Split
- 55% female / 45% male
- Age Distribution
- <65: 12, 65-74: 181, 75-84: 112, 85+: 12
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Matthew Tsushima, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
88 claims
- Balsalazide Disodium
Balsalazide Disodium
43 claims
- Azathioprine 18
Azathioprine
18 claims
- Lactulose 18
Lactulose
18 claims
- Peg3350-Sod Sul-Na… 17
Peg3350-Sod Sul-Nacl-Kcl-Asb-C
17 claims
- Budesonide Dr 11
Budesonide Dr
11 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 88 |
| Balsalazide Disodium | 43 |
| Azathioprine | 18 |
| Lactulose | 18 |
| Peg3350-Sod Sul-Nacl-Kcl-Asb-C Peg3350/Sod Sul/Nacl/Kcl/Asb/C | 17 |
| Budesonide Dr Budesonide | 11 |
| Gavilyte-C "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Matthew Tsushima, M.D. fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Matthew Tsushima, M.D.'s 576 claims are below the specialty average of 833.
Nearby Gastroenterology Physician Providers in Hawaii
Other clinicians with the same primary specialty enrolled in Hawaii, drawn from the same CMS NPPES roster as Tsushima.
Dr. Yousif Arahim
M.D.
Aiea, HI
Dr. Pradeep Atla
M.D.,M.P.H
Hilo, HI
Dr. Edward Bourke
MD
Kailua, HI
Dr. Daniel Chan
MD
Ewa Beach, HI
Dr. Anthony Chiu
MD
Honolulu, HI
Compare Gastroenterology 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 Hawaii medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gastroenterology 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 Matthew Tsushima, M.D.'s specialty? ▼
Matthew Tsushima, M.D. specializes in Gastroenterology Physician and practices in Honolulu, Hawaii. Credentials: M.D..
How much does Matthew Tsushima, M.D. prescribe under Medicare Part D? ▼
In 2023, Matthew Tsushima, M.D. wrote 576 Medicare Part D claims totaling $188K in drug costs for 317 beneficiaries.
Where is Matthew Tsushima, M.D. located? ▼
Matthew Tsushima, M.D. is located at 2828 PAA ST, Honolulu, HI, 96819. Phone: (808) 432-5770.
What is Matthew Tsushima, M.D.'s NPI number? ▼
Matthew Tsushima, M.D.'s National Provider Identifier (NPI) is 1619166923, issued on 10/23/2007.
Does Matthew Tsushima, M.D. prescribe more brand-name or generic drugs? ▼
Matthew Tsushima, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $161K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Matthew Tsushima, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Matthew Tsushima, M.D.'s most frequently prescribed drugs include Pantoprazole Sodium, Balsalazide Disodium, Azathioprine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Matthew Tsushima, M.D. accept Medicare? ▼
Matthew Tsushima, M.D. appears in CMS Medicare data with 576 Part D claims and 317 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Matthew Tsushima, M.D.'s credentials? ▼
Matthew Tsushima, M.D.'s NPI is 1619166923 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.
- 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
Compiled from official public sources by the PlainDoctor editorial team.