2026 NPPES data Optometrist NPI 1891842530 O.D.
Verify on CMS →

Ngoc Nguyen, O.D.

Optometrist in Escondido, California. 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
107
Medicare Part D claims · 36 beneficiaries · Optometrist avg: 257
Generic prescribing
18%
generic claims · 82% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

Ngoc Nguyen, O.D. filed 107 Medicare Part D claims in 2023 as a Optometrist in Escondido, California, prescribing 18% generic.

107
Part D claims, 2023
18%
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.

Ngoc Nguyen, O.D.'s Medicare Part D volume vs every U.S. prescriber

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

107 35th percentile higher than 35% of 1,370,886 prescribers

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

What does the federal data show about Ngoc Nguyen, O.D.?

Quality data not reported

NPI registry status

Active

Issued 01/04/2007

NPI 1891842530

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

107 58% vs specialty avg

2023 prescription claims

Specialty avg: 257

Specialty distribution in California

How Optometrist compares to other specialties among California providers

California providers

Largest specialties in California (% of in-state providers)

Behavior Technician17.3%Marriage & Family Therapist5.5%Student in an Organized Health Care Education/Training Program5%Mental Health Counselor3.9%Pharmacist3.5%Clinical Social Worker3.1%Optometrist0.9%
Largest specialties in California (% of in-state providers)

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).

Ngoc Nguyen, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 1264 AUTO PKWY, Escondido, CA, 92029, with a listed phone of (760) 743-5209. NPI 1891842530 was issued on 01/04/2007. 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 107 prescription claims written by this provider, covering 36 Medicare beneficiaries and totaling roughly $12K in drug spend, split 82% brand-name and 18% 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.

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

1264 AUTO PKWY
Escondido, CA 92029

Provider Details

NPI 1891842530
Specialty Optometrist
Credentials O.D.
Gender Female
NPI Issued 01/04/2007

License & disciplinary context — California MBC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 — they are NOT specific to Ngoc Nguyen, O.D.. To verify Ngoc Nguyen, O.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases

MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Brand-heavy

Ngoc Nguyen, O.D. — brand share 82.0%
Optometrist average

82% brand-name claims vs 18% generic, on 107 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.

107
Total Claims
$12K
Total Drug Cost
36
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
146
Total Day Supply
4,179
Brand vs Generic
82% brand / 18% generic
Brand Drug Cost
$11K
Generic Drug Cost
$950

Patient Demographics

Average Patient Age
74.9 years
Avg HCC Risk Score
0.97
Gender Split
67% female / 33% male
Age Distribution
<65: 0, 65-74: 21, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Cyclosporine
85

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

Optometrist Overview

How Ngoc Nguyen, O.D. fits within the Optometrist landscape nationally.

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

Ngoc Nguyen, O.D.'s 107 claims are below the specialty average of 257.

Nearby Optometrist Providers in California

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

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

Before you book an appointment

Use this federal record as your verification checklist, not as a recommendation.

  • Confirm the NPI record is current in the official CMS registry — providers update their own NPPES details, and moves can lag. Verify this NPI
  • Check the active license and any disciplinary history with the California medical board — federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Optometrist peer on Medicare volume and prescribing patterns. Compare providers

Medicare Part D and MIPS figures describe practice patterns in federal programs only — they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.

Frequently Asked Questions

What is Ngoc Nguyen, O.D.'s specialty?
Ngoc Nguyen, O.D. specializes in Optometrist and practices in Escondido, California. Credentials: O.D..
How much does Ngoc Nguyen, O.D. prescribe under Medicare Part D?
In 2023, Ngoc Nguyen, O.D. wrote 107 Medicare Part D claims totaling $12K in drug costs for 36 beneficiaries.
Where is Ngoc Nguyen, O.D. located?
Ngoc Nguyen, O.D. is located at 1264 AUTO PKWY, Escondido, CA, 92029. Phone: (760) 743-5209.
What is Ngoc Nguyen, O.D.'s NPI number?
Ngoc Nguyen, O.D.'s National Provider Identifier (NPI) is 1891842530, issued on 01/04/2007.
Does Ngoc Nguyen, O.D. prescribe more brand-name or generic drugs?
Ngoc Nguyen, O.D.'s prescribing is 82% brand-name and 18% generic drugs by claim count, with $11K in brand drug costs.
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 Ngoc Nguyen, O.D. prescribe most often?
Based on 2023 Medicare Part D data, Ngoc Nguyen, O.D.'s most frequently prescribed drugs include Cyclosporine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ngoc Nguyen, O.D. accept Medicare?
Ngoc Nguyen, O.D. appears in CMS Medicare data with 107 Part D claims and 36 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ngoc Nguyen, O.D.'s credentials?
Ngoc Nguyen, O.D.'s NPI is 1891842530 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