Prove your expertise in outpatient clinical documentation improvement, compliant provider queries and documentation that supports accurate coding.
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The CDEO (Certified Documentation Expert Outpatient) is the AAPC's credential for clinical documentation improvement (CDI) professionals who work in physician offices and other outpatient settings. It validates your ability to review provider documentation, write compliant queries, connect clinical conditions to accurate ICD-10-CM and CPT code assignment, and support quality reporting and reimbursement. Candidates are typically CDI specialists, coders, auditors and clinicians moving into documentation integrity roles.
The CDEO exam evaluates your knowledge across these areas:
Compliant query practices, CERT findings, OIG compliance guidance and HIPAA rules.
Common diagnoses, their clinical indicators and the documentation that supports them.
Outpatient coding guidelines, Medicare signature rules and medical necessity.
Procedure coding, global surgery, MIPS and healthcare quality measures.
Our question bank is built to help you master the CDEO exam with targeted practice and clear explanations.
Questions structured like the real CDEO exam, including the question styles you'll see on test day.
Know not just the right answer but why the others are wrong - so every question teaches you something.
Every domain on the CDEO content outline is represented across the question sets.
Build the confidence you need to walk into test day calm and prepared.
Assess your knowledge and experience the CDEO format before taking the actual test.
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Mix practice questions into your study from day one to find the topics that need more attention.
Revisit questions you have seen before. Spaced review locks in long-term retention.
When ready, attempt a full set in one timed sitting to build the stamina you need on test day.
Use the explanations to understand each mistake and concentrate on the weak spots.
Choose a study mode below to start preparing for your CDEO exam.
Covers compliant provider queries, CERT and OIG compliance guidance, HIPAA disclosures and reporting obligations.
Start Practice →Tests clinical conditions such as cardiomyopathy, anemia, hypertension, pneumonia and CKD, and the documentation that supports them.
Start Practice →Focuses on outpatient coding guidelines, Medicare documentation and signature rules, and the physician fee schedule.
Start Practice →Reviews procedure coding, bundling, global surgical packages, modifiers and healthcare quality measures.
Start Practice →Applies everything to case scenarios: MIPS, ICD-10-CM conventions, sequencing and outpatient coding decisions.
Start Practice →Coders, CDI specialists, auditors and clinicians who review outpatient provider documentation and want to prove they can improve its accuracy and completeness.
No. The CDEO focuses on documentation in physician practices and other outpatient settings rather than inpatient hospital stays.
Review the ICD-10-CM outpatient guidelines and query best practices, refresh your knowledge of common clinical conditions, then work through case-based practice questions under time pressure. Our five CDEO practice sets follow this outline.
The CDEO shows employers you can bridge clinical care and coding. It supports roles in outpatient clinical documentation improvement, provider education, coding quality and compliance.