2026 NPPES data Specialist NPI 1164463436 M.D.
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BRUCE TAMURA, M.D.

Specialist in HONOLULU, Hawaii. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
3K
Medicare Part D claims · 103 beneficiaries · Specialist avg: 1K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

BRUCE TAMURA, M.D. filed 2,678 Medicare Part D claims in 2023 as a Specialist in HONOLULU, Hawaii, prescribing 81% generic.

3K
Part D claims, 2023
81%
generic prescribing

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.

BRUCE TAMURA, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

2,678 Top 13% higher than 87% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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

What does the federal data show about BRUCE TAMURA, M.D.?

Quality data not reported

NPI registry status

Active

Issued 06/09/2006

NPI 1164463436

Primary specialty

Specialist

High-volume

69,658 US NPIs in this specialty

Medicare Part D claims

2,678 82% vs specialty avg

2023 prescription claims

Specialty avg: 1,474

Specialty distribution in Hawaii

How Specialist compares to other specialties among Hawaii providers

Hawaii providers

Specialist share within Hawaii

1. Specialist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Specialist share within Hawaii

Specialty board-certification context

Estimated specialty board-certified rate — Specialist (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Specialist ABMS/AOA estimate

Est. board-certified rate (Specialist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Specialist) — ABMS / AOA estimate

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).

BRUCE TAMURA, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 347 NORTH KUAKINI ST, HONOLULU, HI, 96817, with a listed phone of (808) 523-8461. NPI 1164463436 was issued on 06/09/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what TAMURA most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 2,678 prescription claims written by this provider, covering 103 Medicare beneficiaries and totaling roughly $216K in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 0.9%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Specialist is a high-volume specialty nationwide, with 69,658 enrolled providers across 55 states and an average of 1,474 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

347 NORTH KUAKINI ST
HONOLULU, HI 96817

Provider Details

NPI 1164463436
Specialty Specialist
Credentials M.D.
Gender Male
NPI Issued 06/09/2006

Brand vs generic prescribing mix · Typical

BRUCE TAMURA, M.D. — brand share 19.0%
Specialty average (est.)

19% brand-name claims vs 81% generic, on 2,678 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.

2,678
Total Claims
$216K
Total Drug Cost
103
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
2,759
Total Day Supply
68,015
Brand vs Generic
19% brand / 81% generic
Brand Drug Cost
$130K
Generic Drug Cost
$84K
Opioid Claims
24 (0.9% rate)
Antibiotic Claims
78

Patient Demographics

Average Patient Age
85.1 years
Avg HCC Risk Score
2.56
Gender Split
67% female / 33% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What BRUCE TAMURA, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Mirtazapine
124
Levothyroxine Sodium
121
Eliquis
Apixaban
76
Gabapentin
75
Tamsulosin Hcl
72
Carvedilol
70
Atorvastatin Calcium
63
Ammonium Lactate
62
Furosemide
62
Lactulose
60

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Specialist Overview

How BRUCE TAMURA, M.D. fits within the Specialist landscape nationally.

69,658
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider

BRUCE TAMURA, M.D.'s 2,678 claims are above the specialty average of 1,474.

Nearby Specialist Providers in Hawaii

Other clinicians with the same primary specialty enrolled in Hawaii, drawn from the same CMS NPPES roster as TAMURA.

Compare Specialist nationally: see state-by-state distribution →

Frequently Asked Questions

What is BRUCE TAMURA, M.D.'s specialty?
BRUCE TAMURA, M.D. specializes in Specialist and practices in HONOLULU, Hawaii. Credentials: M.D..
How much does BRUCE TAMURA, M.D. prescribe under Medicare Part D?
In 2023, BRUCE TAMURA, M.D. wrote 2,678 Medicare Part D claims totaling $216K in drug costs for 103 beneficiaries.
Where is BRUCE TAMURA, M.D. located?
BRUCE TAMURA, M.D. is located at 347 NORTH KUAKINI ST, HONOLULU, HI, 96817. Phone: (808) 523-8461.
What is BRUCE TAMURA, M.D.'s NPI number?
BRUCE TAMURA, M.D.'s National Provider Identifier (NPI) is 1164463436, issued on 06/09/2006.
Does BRUCE TAMURA, M.D. prescribe more brand-name or generic drugs?
BRUCE TAMURA, M.D.'s prescribing is 19% brand-name and 81% generic drugs by claim count, with $130K in brand drug costs.
Does BRUCE TAMURA, M.D. prescribe opioids?
Yes, BRUCE TAMURA, M.D. had 24 opioid claims in 2023 with an opioid prescribing rate of 0.9%.
How many Specialist providers are there in the US?
There are 69,658 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does BRUCE TAMURA, M.D. prescribe most often?
Based on 2023 Medicare Part D data, BRUCE TAMURA, M.D.'s most frequently prescribed drugs include Mirtazapine, Levothyroxine Sodium, Eliquis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does BRUCE TAMURA, M.D. accept Medicare?
BRUCE TAMURA, M.D. appears in CMS Medicare data with 2,678 Part D claims and 103 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify BRUCE TAMURA, M.D.'s credentials?
BRUCE TAMURA, M.D.'s NPI is 1164463436 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

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