NPI registry status
Active
2026 NPPES data Medical Oncology Physician NPI 1467746651 DO
Verify on CMS → Cassandra Lacher, DO
Medical Oncology Physician in Bourbonnais, 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 3,815 in Medical Oncology 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
1K
Medicare Part D claims · 252 beneficiaries · Medical Oncology Physician avg: 689
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$554.34
25 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Cassandra Lacher, DO filed 1,096 Medicare Part D claims in 2023 as a Medical Oncology Physician in Bourbonnais, Illinois, prescribing 87% generic.
- 1K
- Part D claims, 2023
- 87%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Cassandra Lacher, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,096 Top 24% higher than 76% 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
✓
Board certification likely (heuristic, not verified)
Cassandra Lacher, DO 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).
What does the federal data show about Cassandra Lacher, DO?
Quality data not reportedPrimary specialty
Medical Oncology Physician
Medicare Part D claims
1,096 59% vs specialty avg
Specialty distribution in Illinois
How Medical Oncology Physician 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 Medical Oncology Physician. 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).
Cassandra Lacher, DO appears in the CMS NPPES registry as a Medical Oncology Physician provider holding DO credentials at 200 RIVERSIDE DR, Bourbonnais, IL, 60914, with a listed phone of (815) 933-9660. NPI 1467746651 was issued on 06/05/2011.
Medicare Part D records for calendar year 2023 show 1,096 prescription claims written by this provider, covering 252 Medicare beneficiaries and totaling roughly $1.6 million in drug spend, split 13% brand-name and 87% generic by claim count, with an opioid prescribing rate of 3.6%.
Medical Oncology Physician is a narrow specialty nationwide, with 3,815 enrolled providers across 53 states and an average of 689 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 | 1467746651 |
|---|---|
| Specialty | Medical Oncology Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 06/05/2011 |
Hospital and facility affiliations
Facilities where Cassandra Lacher, 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.
Riverside Health System
Willmington, 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).
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 Cassandra Lacher, DO. Source: openpaymentsdata.cms.gov.
Total received
$554
Largest payer
Merck Sharp & Dohme 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.
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 Cassandra Lacher, DO. To verify Cassandra Lacher, 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.
Brand vs generic prescribing mix · Typical
Cassandra Lacher, DO - brand share 13.0%
Medical Oncology Physician average
13% brand-name claims vs 87% generic, on 1,096 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.
1,096
Total Claims
$1.6M
Total Drug Cost
252
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,673
- Total Day Supply
- 43,881
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $192K
- Opioid Claims
- 39 (3.6% rate)
- Antibiotic Claims
- 35
Patient Demographics
- Average Patient Age
- 72.2 years
- Avg HCC Risk Score
- 2.07
- Gender Split
- 76% female / 24% male
- Age Distribution
- <65: 31, 65-74: 123, 75-84: 82, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Cassandra Lacher, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Anastrozole
Anastrozole
185 claims
- Prochlorperazine M…
Prochlorperazine Maleate
87 claims
- Letrozole 70
Letrozole
70 claims
- Ondansetron Hcl 69
Ondansetron Hcl
69 claims
- Acyclovir 47
Acyclovir
47 claims
- Dexamethasone 37
Dexamethasone
37 claims
- Xarelto 29
Xarelto
29 claims
- Venlafaxine Hcl Er 27
Venlafaxine Hcl Er
27 claims
| Drug | Claims |
|---|---|
| Anastrozole | 185 |
| Prochlorperazine Maleate | 87 |
| Letrozole | 70 |
| Ondansetron Hcl | 69 |
| Acyclovir | 47 |
| Dexamethasone | 37 |
| Xarelto Rivaroxaban | 29 |
| Venlafaxine Hcl Er Venlafaxine Hcl | 27 |
| Allopurinol | 26 |
| Gabapentin | 24 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Oncology Physician Overview
How Cassandra Lacher, DO fits within the Medical Oncology Physician landscape nationally.
3,815
Medical Oncology Physician Providers in US
53
States with Medical Oncology Physician
689
Avg Claims per Provider
Cassandra Lacher, DO's 1,096 claims are above the specialty average of 689.
Nearby Medical Oncology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Lacher.
Ahmad Abu-Hashyeh
Moline, IL
Dr. Matthew Adess
MD
Highland Park, IL
Dr. Syed Ahmed
MD
Oak Brook, IL
Dr. Vasia Ahmed
M.D.
Tinley Park, IL
Dr. Eugene Ahn
M.D.
Chicago, IL
Compare Medical Oncology Physician 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 Medical Oncology Physician 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.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
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Frequently Asked Questions
What is Cassandra Lacher, DO's specialty? ▼
Cassandra Lacher, DO specializes in Medical Oncology Physician and practices in Bourbonnais, Illinois. Credentials: DO.
How much does Cassandra Lacher, DO prescribe under Medicare Part D? ▼
In 2023, Cassandra Lacher, DO wrote 1,096 Medicare Part D claims totaling $1.6M in drug costs for 252 beneficiaries.
Where is Cassandra Lacher, DO located? ▼
Cassandra Lacher, DO is located at 200 RIVERSIDE DR, Bourbonnais, IL, 60914. Phone: (815) 933-9660.
What is Cassandra Lacher, DO's NPI number? ▼
Cassandra Lacher, DO's National Provider Identifier (NPI) is 1467746651, issued on 06/05/2011.
Does Cassandra Lacher, DO prescribe more brand-name or generic drugs? ▼
Cassandra Lacher, DO's prescribing is 13% brand-name and 87% generic drugs by claim count, with $1.4M in brand drug costs.
Does Cassandra Lacher, DO prescribe opioids? ▼
Yes, Cassandra Lacher, DO had 39 opioid claims in 2023 with an opioid prescribing rate of 3.6%.
How many Medical Oncology Physician providers are there in the US? ▼
There are 3,815 Medical Oncology Physician providers across 53 states in the US. The average Medical Oncology Physician provider writes 689 Medicare Part D claims per year.
What drugs does Cassandra Lacher, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Cassandra Lacher, DO's most frequently prescribed drugs include Anastrozole, Prochlorperazine Maleate, Letrozole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cassandra Lacher, DO accept Medicare? ▼
Cassandra Lacher, DO appears in CMS Medicare data with 1,096 Part D claims and 252 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cassandra Lacher, DO's credentials? ▼
Cassandra Lacher, DO's NPI is 1467746651 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.
- 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
Compiled from official public sources by the PlainDoctor editorial team.