NPI registry status
Active
2026 NPPES data Physician Assistant NPI 1811274970 PA-C
Verify on CMS → Catherine Kozlowski, PA-C
Physician Assistant in Chicago, 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 150,974 in Physician Assistant, 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
424
Medicare Part D claims · 231 beneficiaries · Physician Assistant avg: 790
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Catherine Kozlowski, PA-C filed 424 Medicare Part D claims in 2023 as a Physician Assistant in Chicago, Illinois, prescribing 93% generic.
- 424
- Part D claims, 2023
- 93%
- 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.
Catherine Kozlowski, PA-C's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
424 Top 38% higher than 62% of 1,370,886 prescribers
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 Catherine Kozlowski, PA-C?
Quality data not reportedPrimary specialty
Physician Assistant
Medicare Part D claims
424 46% vs specialty avg
Specialty distribution in Illinois
How Physician Assistant compares to other specialties among Illinois providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Physician Assistant. Verify directly:
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).
Catherine Kozlowski, PA-C appears in the CMS NPPES registry as a Physician Assistant provider holding PA-C credentials at 3021 NORTH SHEFFIELD AVENUE, Chicago, IL, 60673, with a listed phone of (872) 843-0550. NPI 1811274970 was issued on 11/03/2011.
Medicare Part D records for calendar year 2023 show 424 prescription claims written by this provider, covering 231 Medicare beneficiaries and totaling roughly $19K in drug spend, split 7% brand-name and 93% generic by claim count, with an opioid prescribing rate of 53.3%.
Physician Assistant is a high-volume specialty nationwide, with 150,974 enrolled providers across 56 states and an average of 790 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
Provider Details
| NPI | 1811274970 |
|---|---|
| Specialty | Physician Assistant |
| Credentials | PA-C |
| Gender | Female |
| NPI Issued | 11/03/2011 |
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 Catherine Kozlowski, PA-C. To verify Catherine Kozlowski, PA-C'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.
Brand vs generic prescribing mix · Generic-heavy
Catherine Kozlowski, PA-C - brand share 7.0%
Physician Assistant average
7% brand-name claims vs 93% generic, on 424 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.
424
Total Claims
$19K
Total Drug Cost
231
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 433
- Total Day Supply
- 6,648
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $16K
- Generic Drug Cost
- $3K
- Opioid Claims
- 226 (53.3% rate)
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 1.36
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 21, 65-74: 128, 75-84: 67, 85+: 15
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Catherine Kozlowski, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tramadol Hcl
Tramadol Hcl
98 claims
- Oxycodone Hcl
Oxycodone Hcl
87 claims
- Meloxicam
Meloxicam
64 claims
- Famotidine
Famotidine
58 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
41 claims
- Xarelto 26
Xarelto
26 claims
| Drug | Claims |
|---|---|
| Tramadol Hcl | 98 |
| Oxycodone Hcl | 87 |
| Meloxicam | 64 |
| Famotidine | 58 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 41 |
| Xarelto Rivaroxaban | 26 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Physician Assistant Overview
How Catherine Kozlowski, PA-C fits within the Physician Assistant landscape nationally.
150,974
Physician Assistant Providers in US
56
States with Physician Assistant
790
Avg Claims per Provider
Catherine Kozlowski, PA-C's 424 claims are below the specialty average of 790.
Nearby Physician Assistant Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Kozlowski.
Dr. Brooke Aarhus
PA-C
Park Ridge, IL
Dr. Traci Aaron
PA-C
Chicago, IL
Dr. Sana Abbasi
PA
Carol Stream, IL
Dr. Susan Abbinanti
PA-C
Elk Grove Village, IL
Dr. Katheryn Abbott
PA
Schaumburg, IL
Compare Physician Assistant 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 Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Physician Assistant 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.
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Frequently Asked Questions
What is Catherine Kozlowski, PA-C's specialty? ▼
Catherine Kozlowski, PA-C specializes in Physician Assistant and practices in Chicago, Illinois. Credentials: PA-C.
How much does Catherine Kozlowski, PA-C prescribe under Medicare Part D? ▼
In 2023, Catherine Kozlowski, PA-C wrote 424 Medicare Part D claims totaling $19K in drug costs for 231 beneficiaries.
Where is Catherine Kozlowski, PA-C located? ▼
Catherine Kozlowski, PA-C is located at 3021 NORTH SHEFFIELD AVENUE, Chicago, IL, 60673. Phone: (872) 843-0550.
What is Catherine Kozlowski, PA-C's NPI number? ▼
Catherine Kozlowski, PA-C's National Provider Identifier (NPI) is 1811274970, issued on 11/03/2011.
Does Catherine Kozlowski, PA-C prescribe more brand-name or generic drugs? ▼
Catherine Kozlowski, PA-C's prescribing is 7% brand-name and 93% generic drugs by claim count, with $16K in brand drug costs.
Does Catherine Kozlowski, PA-C prescribe opioids? ▼
Yes, Catherine Kozlowski, PA-C had 226 opioid claims in 2023 with an opioid prescribing rate of 53.3%.
How many Physician Assistant providers are there in the US? ▼
There are 150,974 Physician Assistant providers across 56 states in the US. The average Physician Assistant provider writes 790 Medicare Part D claims per year.
What drugs does Catherine Kozlowski, PA-C prescribe most often? ▼
Based on 2023 Medicare Part D data, Catherine Kozlowski, PA-C's most frequently prescribed drugs include Tramadol Hcl, Oxycodone Hcl, Meloxicam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Catherine Kozlowski, PA-C accept Medicare? ▼
Catherine Kozlowski, PA-C appears in CMS Medicare data with 424 Part D claims and 231 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Catherine Kozlowski, PA-C's credentials? ▼
Catherine Kozlowski, PA-C's NPI is 1811274970 with credentials PA-C. 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.
- 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.