2026 NPPES data Ph.D. Medical Genetics NPI 1225035280 M.D.
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WALTER GARDINER, M.D.

Ph.D. Medical Genetics in CHRISTIANSTED, Virgin Islands. 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
1K
Medicare Part D claims · 67 beneficiaries · Ph.D. Medical Genetics avg: 984
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

WALTER GARDINER, M.D. filed 1,167 Medicare Part D claims in 2023 as a Ph.D. Medical Genetics in CHRISTIANSTED, Virgin Islands, prescribing 91% generic.

1K
Part D claims, 2023
91%
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.

WALTER GARDINER, M.D.'s Medicare Part D volume vs every U.S. prescriber

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

1,167 Top 23% higher than 77% 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%). This entry sits in this band. 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 WALTER GARDINER, M.D.?

Quality data not reported

NPI registry status

Active

Issued 07/06/2005

NPI 1225035280

Primary specialty

Ph.D. Medical Genetics

Rare

357 US NPIs in this specialty

Medicare Part D claims

1,167 19% vs specialty avg

2023 prescription claims

Specialty avg: 984

Specialty distribution in Virgin Islands

How Ph.D. Medical Genetics compares to other specialties among Virgin Islands providers

Virgin Islands providers

Ph.D. Medical Genetics share within Virgin Islands

1. Ph.D. Medical Genetics42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Ph.D. Medical Genetics share within Virgin Islands

Specialty board-certification context

Estimated specialty board-certified rate — Ph.D. Medical Genetics (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Ph.D. Medical Genetics ABMS/AOA estimate

Est. board-certified rate (Ph.D. Medical Genetics) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Ph.D. Medical Genetics) — 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).

WALTER GARDINER, M.D. is a Ph.D. Medical Genetics provider practicing in CHRISTIANSTED, Virgin Islands, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1225035280. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

WALTER GARDINER, M.D. appears in the CMS NPPES registry as a Ph.D. Medical Genetics provider holding M.D. credentials at 5134 SUNDIAL PARK, CHRISTIANSTED, VI, 00820, with a listed phone of (340) 773-3227. NPI 1225035280 was issued on 07/06/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GARDINER 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 1,167 prescription claims written by this provider, covering 67 Medicare beneficiaries and totaling roughly $58K in drug spend, split 9% brand-name and 91% 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.

Ph.D. Medical Genetics is a narrow specialty nationwide, with 357 enrolled providers across 46 states and an average of 984 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

5134 SUNDIAL PARK
CHRISTIANSTED, VI 00820

Provider Details

NPI 1225035280
Specialty Ph.D. Medical Genetics
Credentials M.D.
Gender Male
NPI Issued 07/06/2005

Brand vs generic prescribing mix · Generic-heavy

WALTER GARDINER, M.D. — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 1,167 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.

1,167
Total Claims
$58K
Total Drug Cost
67
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,294
Total Day Supply
38,090
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$33K
Generic Drug Cost
$24K
Antibiotic Claims
19

Patient Demographics

Average Patient Age
74.2 years
Avg HCC Risk Score
4.42
Gender Split
31% female / 69% 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
Nifedipine Er
Nifedipine
177
Losartan Potassium
166
Atorvastatin Calcium
76
Metformin Hcl
64
Pantoprazole Sodium
58
Glipizide Er
Glipizide
57
Calcium Acetate
52
Amlodipine Besylate
45
Labetalol Hcl
43
Glipizide
40

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

Ph.D. Medical Genetics Overview

How WALTER GARDINER, M.D. fits within the Ph.D. Medical Genetics landscape nationally.

357
Ph.D. Medical Genetics Providers in US
46
States with Ph.D. Medical Genetics
984
Avg Claims per Provider

WALTER GARDINER, M.D.'s 1,167 claims are above the specialty average of 984.

Frequently Asked Questions

What is WALTER GARDINER, M.D.'s specialty?
WALTER GARDINER, M.D. specializes in Ph.D. Medical Genetics and practices in CHRISTIANSTED, Virgin Islands. Credentials: M.D..
How much does WALTER GARDINER, M.D. prescribe under Medicare Part D?
In 2023, WALTER GARDINER, M.D. wrote 1,167 Medicare Part D claims totaling $58K in drug costs for 67 beneficiaries.
Where is WALTER GARDINER, M.D. located?
WALTER GARDINER, M.D. is located at 5134 SUNDIAL PARK, CHRISTIANSTED, VI, 00820. Phone: (340) 773-3227.
What is WALTER GARDINER, M.D.'s NPI number?
WALTER GARDINER, M.D.'s National Provider Identifier (NPI) is 1225035280, issued on 07/06/2005.
Does WALTER GARDINER, M.D. prescribe more brand-name or generic drugs?
WALTER GARDINER, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $33K in brand drug costs.
How many Ph.D. Medical Genetics providers are there in the US?
There are 357 Ph.D. Medical Genetics providers across 46 states in the US. The average Ph.D. Medical Genetics provider writes 984 Medicare Part D claims per year.
What drugs does WALTER GARDINER, M.D. prescribe most often?
Based on 2023 Medicare Part D data, WALTER GARDINER, M.D.'s most frequently prescribed drugs include Nifedipine Er, Losartan Potassium, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does WALTER GARDINER, M.D. accept Medicare?
WALTER GARDINER, M.D. appears in CMS Medicare data with 1,167 Part D claims and 67 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WALTER GARDINER, M.D.'s credentials?
WALTER GARDINER, M.D.'s NPI is 1225035280 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