2026 NPPES data General Practice Physician NPI 1598895351 D.O.
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ADAM GRATZ, D.O.

General Practice Physician in HAWI, 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
278
Medicare Part D claims · 62 beneficiaries · General Practice Physician avg: 3K

What the federal data shows

ADAM GRATZ, D.O. filed 278 Medicare Part D claims in 2023 as a General Practice Physician in HAWI, Hawaii.

278
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.

ADAM GRATZ, D.O.'s Medicare Part D volume vs every U.S. prescriber

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

278 49th percentile higher than 49% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). This entry sits in this band. 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

Board-eligible specialty (heuristic — not verified)

ADAM GRATZ, D.O. 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 ADAM GRATZ, D.O.?

Quality data not reported

NPI registry status

Active

Issued 03/07/2007

NPI 1598895351

Primary specialty

General Practice Physician

Mid-sized

16,677 US NPIs in this specialty

Medicare Part D claims

278 90% vs specialty avg

2023 prescription claims

Specialty avg: 2,872

Specialty distribution in Hawaii

How General Practice Physician compares to other specialties among Hawaii providers

Hawaii providers

General Practice Physician share within Hawaii

1. General Practice Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
General Practice Physician share within Hawaii

Specialty board-certification context

Estimated specialty board-certified rate — General Practice Physician (ABMS / AOA reference)

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

Est. board-certified rate (General Practice Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (General Practice Physician) — 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).

ADAM GRATZ, D.O. appears in the CMS NPPES registry as a General Practice Physician provider holding D.O. credentials at 55-515 HAWI RD, HAWI, HI, 96719, with a listed phone of (808) 960-3311. NPI 1598895351 was issued on 03/07/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GRATZ 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 278 prescription claims written by this provider, covering 62 Medicare beneficiaries and totaling roughly $25K in drug spend, with an opioid prescribing rate of 7.2%. 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.

General Practice Physician is a mid-sized specialty nationwide, with 16,677 enrolled providers across 56 states and an average of 2,872 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

55-515 HAWI RD
HAWI, HI 96719

Provider Details

NPI 1598895351
Specialty General Practice Physician
Credentials D.O.
Gender Male
NPI Issued 03/07/2007

Medicare Part D Prescribing Data

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

278
Total Claims
$25K
Total Drug Cost
62
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
543
Total Day Supply
15,243
Generic Drug Cost
$7K
Opioid Claims
20 (7.2% rate)

Patient Demographics

Average Patient Age
74.7 years
Avg HCC Risk Score
0.79
Gender Split
53% female / 47% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Levothyroxine Sodium
12
Losartan Potassium
11

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

General Practice Physician Overview

How ADAM GRATZ, D.O. fits within the General Practice Physician landscape nationally.

16,677
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider

ADAM GRATZ, D.O.'s 278 claims are below the specialty average of 2,872.

Nearby General Practice Physician Providers in Hawaii

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

Compare General Practice Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ADAM GRATZ, D.O.'s specialty?
ADAM GRATZ, D.O. specializes in General Practice Physician and practices in HAWI, Hawaii. Credentials: D.O..
How much does ADAM GRATZ, D.O. prescribe under Medicare Part D?
In 2023, ADAM GRATZ, D.O. wrote 278 Medicare Part D claims totaling $25K in drug costs for 62 beneficiaries.
Where is ADAM GRATZ, D.O. located?
ADAM GRATZ, D.O. is located at 55-515 HAWI RD, HAWI, HI, 96719. Phone: (808) 960-3311.
What is ADAM GRATZ, D.O.'s NPI number?
ADAM GRATZ, D.O.'s National Provider Identifier (NPI) is 1598895351, issued on 03/07/2007.
Does ADAM GRATZ, D.O. prescribe opioids?
Yes, ADAM GRATZ, D.O. had 20 opioid claims in 2023 with an opioid prescribing rate of 7.2%.
How many General Practice Physician providers are there in the US?
There are 16,677 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does ADAM GRATZ, D.O. prescribe most often?
Based on 2023 Medicare Part D data, ADAM GRATZ, D.O.'s most frequently prescribed drugs include Levothyroxine Sodium, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ADAM GRATZ, D.O. accept Medicare?
ADAM GRATZ, D.O. appears in CMS Medicare data with 278 Part D claims and 62 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ADAM GRATZ, D.O.'s credentials?
ADAM GRATZ, D.O.'s NPI is 1598895351 with credentials D.O.. 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