2026 NPPES data Ophthalmology Physician NPI 1841811221 MD
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KIMBERLY NGUYEN, MD

Ophthalmology Physician in PORTLAND, Oregon. 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
79
Medicare Part D claims · 30 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
61%
generic claims · 39% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$150
1 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: KIMBERLY NGUYEN, MD is a Ophthalmology Physician ([object Object]) practicing in PORTLAND, Oregon with a Medicare Part D prescribing footprint of 79 claims across 30 beneficiaries — 39% brand-name prescribing . Industry payments of $150 across 1 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: KIMBERLY NGUYEN, MD filed 79 Medicare Part D claims in 2023 across PORTLAND, Oregon. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

KIMBERLY NGUYEN, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

KIMBERLY NGUYEN, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 04/27/2020

NPI 1841811221

Primary specialty

Ophthalmology Physician

Mid-sized

22,090 US NPIs in this specialty

Medicare Part D claims

79 94% vs specialty avg

2023 prescription claims

Specialty avg: 1,420

Specialty distribution in Oregon

How Ophthalmology Physician compares to other specialties among Oregon providers

Oregon providers

Ophthalmology Physician share within Oregon

1. Ophthalmology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Ophthalmology Physician share within Oregon

Specialty board-certification context

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

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

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

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

KIMBERLY NGUYEN, MD is a Ophthalmology Physician provider practicing in PORTLAND, Oregon, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1841811221. 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.

KIMBERLY NGUYEN, MD appears in the CMS NPPES registry as a Ophthalmology Physician provider holding MD credentials at 3181 SW SAM JACKSON PARK RD, PORTLAND, OR, 97239, with a listed phone of (503) 494-3000. NPI 1841811221 was issued on 04/27/2020. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what NGUYEN 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 79 prescription claims written by this provider, covering 30 Medicare beneficiaries and totaling roughly $4K in drug spend, split 39% brand-name and 61% 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.

Ophthalmology Physician is a mid-sized specialty nationwide, with 22,090 enrolled providers across 56 states and an average of 1,420 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

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Provider Details

NPI 1841811221
Specialty Ophthalmology Physician
Credentials MD
Gender Female
NPI Issued 04/27/2020

Hospital and facility affiliations

Facilities where KIMBERLY NGUYEN, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

UNIVERSITY PROFESSIONAL SERVICES
PORTLAND, OR

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for KIMBERLY NGUYEN, MD. Source: openpaymentsdata.cms.gov.

Total received

$150

Largest payer

Alcon Vision LLC

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Brand vs generic prescribing mix · Above average

KIMBERLY NGUYEN, MD — brand share 39.0%
Specialty average (est.)

39% brand-name claims vs 61% generic, on 79 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.

79
Total Claims
$4K
Total Drug Cost
30
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
126
Total Day Supply
3,290
Brand vs Generic
39% brand / 61% generic
Brand Drug Cost
$2K
Generic Drug Cost
$2K

Patient Demographics

Average Patient Age
70.3 years
Avg HCC Risk Score
1.30
Gender Split
47% female / 53% 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
Latanoprost
24

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

Ophthalmology Physician Overview

How KIMBERLY NGUYEN, MD fits within the Ophthalmology Physician landscape nationally.

22,090
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider

KIMBERLY NGUYEN, MD's 79 claims are below the specialty average of 1,420.

Nearby Ophthalmology Physician Providers in Oregon

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

Compare Ophthalmology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is KIMBERLY NGUYEN, MD's specialty?
KIMBERLY NGUYEN, MD specializes in Ophthalmology Physician and practices in PORTLAND, Oregon. Credentials: MD.
How much does KIMBERLY NGUYEN, MD prescribe under Medicare Part D?
In 2023, KIMBERLY NGUYEN, MD wrote 79 Medicare Part D claims totaling $4K in drug costs for 30 beneficiaries.
Where is KIMBERLY NGUYEN, MD located?
KIMBERLY NGUYEN, MD is located at 3181 SW SAM JACKSON PARK RD, PORTLAND, OR, 97239. Phone: (503) 494-3000.
What is KIMBERLY NGUYEN, MD's NPI number?
KIMBERLY NGUYEN, MD's National Provider Identifier (NPI) is 1841811221, issued on 04/27/2020.
Does KIMBERLY NGUYEN, MD prescribe more brand-name or generic drugs?
KIMBERLY NGUYEN, MD's prescribing is 39% brand-name and 61% generic drugs by claim count, with $2K in brand drug costs.
How many Ophthalmology Physician providers are there in the US?
There are 22,090 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does KIMBERLY NGUYEN, MD prescribe most often?
Based on 2023 Medicare Part D data, KIMBERLY NGUYEN, MD's most frequently prescribed drugs include Latanoprost. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does KIMBERLY NGUYEN, MD accept Medicare?
KIMBERLY NGUYEN, MD appears in CMS Medicare data with 79 Part D claims and 30 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify KIMBERLY NGUYEN, MD's credentials?
KIMBERLY NGUYEN, MD's NPI is 1841811221 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