NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1346441656 DO
Verify on CMS → Katrina Nguyen, DO
Emergency Medicine Physician in Napervile, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 64,463 in Emergency Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
211
Medicare Part D claims · 144 beneficiaries · Emergency Medicine Physician avg: 352
MIPS score
75/100
CMS neutral threshold · no category scores published
What the federal data shows
Katrina Nguyen, DO carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 211 Medicare Part D claims in 2023.
- 75/100
- CMS neutral score · not measured
- 211
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥49th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1346441656 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-NEUTRAL · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1346441656
- ENUM-MID 2007
- TAX-MEGA 64K Emergency Medicine
- MIPS-NEUTRAL 75/100
- RX-LIGHT 211
- BOOK-LIGHT 2,985 in Illinois
- PHOTO-ENUM Lynn Ji · 2007
Katrina Nguyen, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
211 ≥ 49th percentile 49% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Katrina Nguyen, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Katrina Nguyen, DO?
CMS neutral score, not measuredPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
211 40% vs specialty avg
MIPS final score
75/100
Specialty distribution in Illinois
How Emergency Medicine Physician compares to other specialties among Illinois providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
How MIPS and board certification work
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).
Practice Address
Provider Details
| NPI | 1346441656 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 05/31/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Group practice
Hospital and facility affiliations
Facilities where Katrina Nguyen, DO 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.
Edward Hospital
★★★☆☆ 3/5
Naperville, IL
Acute Care Hospitals
CMS CCN: 140231
Karas PC
Orland Park, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Illinois IDFPR 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 ~42K Illinois medical licensees in 2023 - they are NOT specific to Katrina Nguyen, DO. To verify Katrina Nguyen, DO's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR 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 Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
211
Total Claims
$4K
Total Drug Cost
144
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 212
- Total Day Supply
- 2,019
- Generic Drug Cost
- $2K
- Opioid Claims
- 29 (13.7% rate)
- Antibiotic Claims
- 56
Patient Demographics
- Average Patient Age
- 75.5 years
- Avg HCC Risk Score
- 1.76
- Gender Split
- 63% female / 38% male
- Age Distribution
- <65: 11, 65-74: 57, 75-84: 48, 85+: 28
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Katrina Nguyen, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cephalexin
Cephalexin
20 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
20 claims
- Methylprednisolone
Methylprednisolone
17 claims
- Ibuprofen
Ibuprofen
12 claims
| Drug | Claims |
|---|---|
| Cephalexin | 20 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 20 |
| Methylprednisolone | 17 |
| Ibuprofen | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Katrina Nguyen, DO fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Katrina Nguyen, DO's 211 claims are below the specialty average of 352.
Nationwide Emergency Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nguyen, both outside Illinois so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Emergency Medicine Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Nguyen.
One of 2,985 Emergency Medicine Physician providers enrolled in Illinois, 5 are shown here.
Dr. Osama Aaflaq
M.D.
Carbondale, IL
Dr. Suresh Abad
M.D.
Vernon Hills, IL
Dr. Albert Abalos
M.D.
Elmhurst, IL
Dr. Habib Abbasi
M.D.
Joliet, IL
Dr. Andrew Abbeg
D.O.
Greenville, IL
Compare Emergency Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Katrina Nguyen, DO's specialty? ▼
Katrina Nguyen, DO specializes in Emergency Medicine Physician and practices in Napervile, Illinois. Credentials: DO.
How much does Katrina Nguyen, DO prescribe under Medicare Part D? ▼
In 2023, Katrina Nguyen, DO wrote 211 Medicare Part D claims totaling $4K in drug costs for 144 beneficiaries.
What is Katrina Nguyen, DO's Medicare quality score? ▼
Katrina Nguyen, DO has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Katrina Nguyen, DO located? ▼
Katrina Nguyen, DO is located at 801 S. WASHINGTON ST., Napervile, IL, 60540. Phone: (630) 527-3000.
What is Katrina Nguyen, DO's NPI number? ▼
Katrina Nguyen, DO's National Provider Identifier (NPI) is 1346441656, issued on 05/31/2007.
Does Katrina Nguyen, DO prescribe opioids? ▼
Yes, Katrina Nguyen, DO had 29 opioid claims in 2023 with an opioid prescribing rate of 13.7%.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Katrina Nguyen, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Katrina Nguyen, DO's most frequently prescribed drugs include Cephalexin, Hydrocodone-Acetaminophen, Methylprednisolone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katrina Nguyen, DO accept Medicare? ▼
Katrina Nguyen, DO appears in CMS Medicare data with 211 Part D claims and 144 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katrina Nguyen, DO's credentials? ▼
Katrina Nguyen, DO's NPI is 1346441656 with credentials DO. 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
View source datasets and methodology notes
- 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.