2026 NPPES data Internal Medicine Physician NPI 1295787216 MD
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Reginald Buesa, MD

Internal Medicine Physician in Kahului, 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 172,858 in Internal Medicine 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
3K
Medicare Part D claims · 64 beneficiaries · Internal Medicine Physician avg: 3K
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Reginald Buesa, MD filed 2,516 Medicare Part D claims in 2023 as a Internal Medicine Physician in Kahului, Hawaii.

3K
Part D claims, 2023

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.

Reginald Buesa, MD's Medicare Part D volume vs every U.S. prescriber

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

2,516 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. 2K+: 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

Board-eligible specialty (heuristic, not verified)

Reginald Buesa, MD 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 Reginald Buesa, MD?

Quality data not reported

NPI registry status

Active

Issued 05/17/2006

NPI 1295787216

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

2,516 7% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in Hawaii

How Internal Medicine Physician compares to other specialties among Hawaii providers

Hawaii providers

Largest specialties in Hawaii (% of in-state providers)

Behavior Technician - 16.4%Behavior Technician16.4%Massage Therapist - 4.3%Massage Therapist4.3%Physical Therapist - 3.7%Physical Therapist3.7%Pharmacist - 3.7%Pharmacist3.7%Mental Health Counselor - 3.1%Mental Health Counselor3.1%Internal Medicine Physician - 3.1%Internal Medicine Physician3.1%
Largest specialties in Hawaii (% of in-state 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 Internal Medicine Physician. Verify directly:

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).

Reginald Buesa, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 53 S PUUNENE AVE, Kahului, HI, 96732, with a listed phone of (808) 877-6020. NPI 1295787216 was issued on 05/17/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Buesa 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 2,516 prescription claims written by this provider, covering 64 Medicare beneficiaries and totaling roughly $171K in drug spend, with an opioid prescribing rate of 2.6%. 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.

Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 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

53 S PUUNENE AVE
Kahului, HI 96732

Provider Details

NPI 1295787216
Specialty Internal Medicine Physician
Credentials MD
Gender Male
NPI Issued 05/17/2006

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

2,516
Total Claims
$171K
Total Drug Cost
64
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
2,527
Total Day Supply
52,115
Generic Drug Cost
$44K
Opioid Claims
66 (2.6% rate)
Antibiotic Claims
31

Patient Demographics

Average Patient Age
76.1 years
Avg HCC Risk Score
2.50
Gender Split
61% female / 39% male

Top Prescribed Drugs (Medicare Part D)

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

What Reginald Buesa, MD 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
Atorvastatin Calcium
163
Levothyroxine Sodium
159
Sertraline Hcl
133
Losartan Potassium
125
Eliquis
Apixaban
79
Metoprolol Succinate
78
Furosemide
72
Amlodipine Besylate
71
Duloxetine Hcl
60
Trazodone Hcl
58

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

Internal Medicine Physician Overview

How Reginald Buesa, MD fits within the Internal Medicine Physician landscape nationally.

172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider

Reginald Buesa, MD's 2,516 claims are below the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in Hawaii

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

Compare Internal Medicine 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 Internal Medicine 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.

Frequently Asked Questions

What is Reginald Buesa, MD's specialty?
Reginald Buesa, MD specializes in Internal Medicine Physician and practices in Kahului, Hawaii. Credentials: MD.
How much does Reginald Buesa, MD prescribe under Medicare Part D?
In 2023, Reginald Buesa, MD wrote 2,516 Medicare Part D claims totaling $171K in drug costs for 64 beneficiaries.
Where is Reginald Buesa, MD located?
Reginald Buesa, MD is located at 53 S PUUNENE AVE, Kahului, HI, 96732. Phone: (808) 877-6020.
What is Reginald Buesa, MD's NPI number?
Reginald Buesa, MD's National Provider Identifier (NPI) is 1295787216, issued on 05/17/2006.
Does Reginald Buesa, MD prescribe opioids?
Yes, Reginald Buesa, MD had 66 opioid claims in 2023 with an opioid prescribing rate of 2.6%.
How many Internal Medicine Physician providers are there in the US?
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Reginald Buesa, MD prescribe most often?
Based on 2023 Medicare Part D data, Reginald Buesa, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Sertraline Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Reginald Buesa, MD accept Medicare?
Reginald Buesa, MD appears in CMS Medicare data with 2,516 Part D claims and 64 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Reginald Buesa, MD's credentials?
Reginald Buesa, MD's NPI is 1295787216 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

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.