NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1588828727 M.D.
Verify on CMS → Frederick Fong, M.D.
Internal Medicine 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 172,737 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
46
Medicare Part D claims · Internal Medicine Physician avg: 3K
What the federal data shows
Frederick Fong, M.D. filed 46 Medicare Part D claims in 2023 as an Internal Medicine Physician in Honolulu, Hawaii.
- 46
- Part D claims, 2023
- ≥0th
- pct by Part D claim volume (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.
CMS NPPES provider registry desk
NPI 1588828727 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-TRACE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1588828727
- ENUM-MID 2008
- TAX-MEGA 173K Internal Medicine
- RX-TRACE 46
- BOOK-LIGHT 989 in Hawaii
- PHOTO-ENUM Maria Guillen Sacoto · 2008
Frederick Fong, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
46 ≥ 0th percentile 0% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Frederick Fong, M.D. 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 Frederick Fong, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
46 98% vs specialty avg
Specialty distribution in Hawaii
How Internal Medicine 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 Internal Medicine 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).
Practice Address
Provider Details
| NPI | 1588828727 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/16/2008 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
46
Total Claims
$866
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 82
- Total Day Supply
- 2,382
- Generic Drug Cost
- $835
Patient Demographics
- Average Patient Age
- 69.0 years
- Avg HCC Risk Score
- 0.45
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Losartan-Hydrochlorothiazide Losartan/Hydrochlorothiazide | 12 |
| Metoprolol Succinate | 12 |
* 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 Frederick Fong, M.D. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Frederick Fong, M.D.'s 46 claims are below the specialty average of 2,716.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Fong, both outside Hawaii so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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 Fong.
One of 989 Internal Medicine Physician providers enrolled in Hawaii, 5 are shown here.
Dr. Michael Abdo
M.D.
Ewa Beach, HI
Dr. Carlos Abeyta
MD
Hilo, HI
Dr. Harry Acuna
MD
Waipahu, HI
Dr. Dale Adams
MD
Kailua, HI
Dr. Kevin Adams
MD
Honolulu, HI
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Frederick Fong, M.D.'s specialty? ▼
Frederick Fong, M.D. specializes in Internal Medicine Physician and practices in Honolulu, Hawaii. Credentials: M.D..
How much does Frederick Fong, M.D. prescribe under Medicare Part D? ▼
In 2023, Frederick Fong, M.D. wrote 46 Medicare Part D claims totaling $866 in drug costs for N/A beneficiaries.
Where is Frederick Fong, M.D. located? ▼
Frederick Fong, M.D. is located at 1380 LUSITANA ST, Honolulu, HI, 96813. Phone: (808) 531-7551.
What is Frederick Fong, M.D.'s NPI number? ▼
Frederick Fong, M.D.'s National Provider Identifier (NPI) is 1588828727, issued on 07/16/2008.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 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 Frederick Fong, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Frederick Fong, M.D.'s most frequently prescribed drugs include Losartan-Hydrochlorothiazide, Metoprolol Succinate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Frederick Fong, M.D. accept Medicare? ▼
Frederick Fong, M.D. appears in CMS Medicare data with 46 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Frederick Fong, M.D.'s credentials? ▼
Frederick Fong, M.D.'s NPI is 1588828727 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
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 May 2026.