2026 NPPES data Optometrist NPI 1003996554 O.D.
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PHYLLIS LIU, O.D.

Optometrist in WOODBRIDGE, Connecticut. 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
13
Medicare Part D claims · Optometrist avg: 257
What the federal data reveals: PHYLLIS LIU, O.D. is a Optometrist ([object Object]) practicing in WOODBRIDGE, Connecticut with a Medicare Part D prescribing footprint of 13 claims .

What stands out: PHYLLIS LIU, O.D. filed 13 Medicare Part D claims in 2023 across WOODBRIDGE, Connecticut. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

PHYLLIS LIU, O.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 10/17/2006

NPI 1003996554

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

13 95% vs specialty avg

2023 prescription claims

Specialty avg: 257

Specialty distribution in Connecticut

How Optometrist compares to other specialties among Connecticut providers

Connecticut providers

Optometrist share within Connecticut

1. Optometrist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Optometrist share within Connecticut

Specialty board-certification context

Estimated specialty board-certified rate — Optometrist (ABMS / AOA reference)

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

Est. board-certified rate (Optometrist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Optometrist) — 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).

PHYLLIS LIU, O.D. is a Optometrist provider practicing in WOODBRIDGE, Connecticut, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: O.D.. NPI: 1003996554. 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.

PHYLLIS LIU, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 264 AMITY RD STE 212, WOODBRIDGE, CT, 06525, with a listed phone of (203) 387-0038. NPI 1003996554 was issued on 10/17/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what LIU 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 13 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $109 in drug spend. 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.

Optometrist is a high-volume specialty nationwide, with 60,463 enrolled providers across 56 states and an average of 257 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

264 AMITY RD STE 212
WOODBRIDGE, CT 06525

Provider Details

NPI 1003996554
Specialty Optometrist
Credentials O.D.
Gender Female
NPI Issued 10/17/2006

Medicare Part D Prescribing Data

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

13
Total Claims
$109
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
13
Total Day Supply
65
Brand Drug Cost
$0
Generic Drug Cost
$109
Antibiotic Claims
13

Patient Demographics

Average Patient Age
75.0 years
Avg HCC Risk Score
1.77

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Azithromycin
13

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

Optometrist Overview

How PHYLLIS LIU, O.D. fits within the Optometrist landscape nationally.

60,463
Optometrist Providers in US
56
States with Optometrist
257
Avg Claims per Provider

PHYLLIS LIU, O.D.'s 13 claims are below the specialty average of 257.

Nearby Optometrist Providers in Connecticut

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

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

Frequently Asked Questions

What is PHYLLIS LIU, O.D.'s specialty?
PHYLLIS LIU, O.D. specializes in Optometrist and practices in WOODBRIDGE, Connecticut. Credentials: O.D..
How much does PHYLLIS LIU, O.D. prescribe under Medicare Part D?
In 2023, PHYLLIS LIU, O.D. wrote 13 Medicare Part D claims totaling $109 in drug costs for N/A beneficiaries.
Where is PHYLLIS LIU, O.D. located?
PHYLLIS LIU, O.D. is located at 264 AMITY RD STE 212, WOODBRIDGE, CT, 06525. Phone: (203) 387-0038.
What is PHYLLIS LIU, O.D.'s NPI number?
PHYLLIS LIU, O.D.'s National Provider Identifier (NPI) is 1003996554, issued on 10/17/2006.
How many Optometrist providers are there in the US?
There are 60,463 Optometrist providers across 56 states in the US. The average Optometrist provider writes 257 Medicare Part D claims per year.
What drugs does PHYLLIS LIU, O.D. prescribe most often?
Based on 2023 Medicare Part D data, PHYLLIS LIU, O.D.'s most frequently prescribed drugs include Azithromycin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does PHYLLIS LIU, O.D. accept Medicare?
PHYLLIS LIU, O.D. appears in CMS Medicare data with 13 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 PHYLLIS LIU, O.D.'s credentials?
PHYLLIS LIU, O.D.'s NPI is 1003996554 with credentials O.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