2026 NPPES data Specialist NPI 1235169806 M.D.
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THOMAS TASAKI, 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
35
Medicare Part D claims · 18 beneficiaries · Specialist avg: 1K
Generic prescribing
66%
generic claims · 34% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

THOMAS TASAKI, M.D. filed 35 Medicare Part D claims in 2023 as a Specialist in HONOLULU, Hawaii, prescribing 66% generic.

35
Part D claims, 2023
66%
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.

THOMAS TASAKI, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

35 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. 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 THOMAS TASAKI, M.D.?

Quality data not reported

NPI registry status

Active

Issued 07/03/2006

NPI 1235169806

Primary specialty

Specialist

High-volume

69,658 US NPIs in this specialty

Medicare Part D claims

35 98% 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).

THOMAS TASAKI, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 1380 LUSITANA ST, HONOLULU, HI, 96813, with a listed phone of (808) 521-3802. NPI 1235169806 was issued on 07/03/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what TASAKI 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 35 prescription claims written by this provider, covering 18 Medicare beneficiaries and totaling roughly $13K in drug spend, split 34% brand-name and 66% generic by claim count. 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

1380 LUSITANA ST
HONOLULU, HI 96813

Provider Details

NPI 1235169806
Specialty Specialist
Credentials M.D.
Gender Male
NPI Issued 07/03/2006

Brand vs generic prescribing mix · Above average

THOMAS TASAKI, M.D. — brand share 34.0%
Specialty average (est.)

34% brand-name claims vs 66% generic, on 35 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.

35
Total Claims
$13K
Total Drug Cost
18
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
77
Total Day Supply
2,310
Brand vs Generic
34% brand / 66% generic
Brand Drug Cost
$11K
Generic Drug Cost
$2K

Patient Demographics

Average Patient Age
71.4 years
Avg HCC Risk Score
7.39

Specialist Overview

How THOMAS TASAKI, M.D. fits within the Specialist landscape nationally.

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

THOMAS TASAKI, M.D.'s 35 claims are below 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 TASAKI.

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

Frequently Asked Questions

What is THOMAS TASAKI, M.D.'s specialty?
THOMAS TASAKI, M.D. specializes in Specialist and practices in HONOLULU, Hawaii. Credentials: M.D..
How much does THOMAS TASAKI, M.D. prescribe under Medicare Part D?
In 2023, THOMAS TASAKI, M.D. wrote 35 Medicare Part D claims totaling $13K in drug costs for 18 beneficiaries.
Where is THOMAS TASAKI, M.D. located?
THOMAS TASAKI, M.D. is located at 1380 LUSITANA ST, HONOLULU, HI, 96813. Phone: (808) 521-3802.
What is THOMAS TASAKI, M.D.'s NPI number?
THOMAS TASAKI, M.D.'s National Provider Identifier (NPI) is 1235169806, issued on 07/03/2006.
Does THOMAS TASAKI, M.D. prescribe more brand-name or generic drugs?
THOMAS TASAKI, M.D.'s prescribing is 34% brand-name and 66% generic drugs by claim count, with $11K in brand drug costs.
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.
Does THOMAS TASAKI, M.D. accept Medicare?
THOMAS TASAKI, M.D. appears in CMS Medicare data with 35 Part D claims and 18 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify THOMAS TASAKI, M.D.'s credentials?
THOMAS TASAKI, M.D.'s NPI is 1235169806 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