ICD 10 Study Guide 2026
Everything you need to pass the ICD 10 exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 ICD 10 Exam Format at a Glance
📚 ICD 10 Topics to Study (31)
✍️ Sample ICD 10 Questions & Answers
1. A reviewer must verify a neoplasm code. The neoplasm table is organized primarily by:
The neoplasm table is arranged by anatomic site with columns for behavior.
2. How many characters can a complete ICD-10-CM code contain at maximum?
ICD-10-CM codes range from 3 to 7 characters, with 7 being the maximum length.
3. How should you approach questions you find difficult during an exam?
Moving past difficult questions ensures you answer all questions you know, then return to harder ones with remaining time and possibly new insight from other questions.
4. What does the first character of an ICD-10-CM code represent?
The first character is always a letter that corresponds to a specific chapter of the ICD-10-CM classification, such as J for respiratory diseases.
5. A coder reviews a borderline diagnosis documented by the provider. Guidelines direct that it be coded as:
Borderline diagnoses are coded as confirmed unless a specific index entry directs otherwise.
6. Which chapter of ICD-10-CM is used for codes beginning with the letter 'O'?
Chapter 15 (codes O00–O9A) covers pregnancy, childbirth, and the puerperium.