MRC135 - ICD10: Diagnostic Coding

Week 1: ICD-10-CM Review and Conventions

In a code title "with" means "associated with" or "due to."

For more details, review the coding conventions in ICD-10-CM.


The following readings will help you learn about the concepts covered this week:

Required Readings

  • Understanding Health Insurance Chapter 6, "ICD-10-CM Coding," pp.198-206
  • ICD-10-CM Official Conventions
  • ICD-10-CM Official Guidelines for Coding and Reporting 2016, Section I.A

Click the link below to access the required readings.

Chapter 6

ICD-10-CM Review

ICD-10-CM is a set of codes used to identify diagnoses. It can also be used to code signs, symptoms, and circumstances surrounding healthcare. Although hospitals (or inpatient providers) and physicians (or outpatient providers) use different code sets to code procedures, all providers use ICD-10-CM to code diagnoses, so it is a critically important set of codes for every coder to know.

The ICD-10-CM is a clinical modification (hence the “CM”) of ICD-10. ICD-10, which is copyrighted by the World Health Organization, is used to code and classify mortality data from death certificates.

The clinical modification is described by the Centers for Disease Control as a “significant improvement over ICD-9-CM and ICD-10.” Why is that? Click the link to read the description of ICD-10-CM on the CDC’s website and find out.


For more historical information about the development of ICD-10-CM, click the link to read a brief article from the Department of Health and Human Services. It might surprise you to know how long ICD-10-CM has been in development!

Development of ICD-10-CM

After reviewing the article, consider answering the following questions in the Questions Forum:

  • Why do you think the ICD-10-CM was in development for so long before being implemented in the U.S.?
  • What are the benefits of using ICD-10-CM rather than ICD-9-CM, according to the articles?

ICD-10-CM Exercises

As you complete your required readings, you will see exercises throughout your textbook. These exercises will help you identify important aspects of the development and use of ICD-10-CM. They will also help you prepare for the graded quiz.

Complete the following practice exercises are in Understanding Health Insurance, Chapter 6 :

  • Exercise 6-2 (all)
  • Exercise 6-3 (all)
  • Exercise 6-6 (all)
  • Exercise 6-7, #s 1-12 only

Then click the link to compare the answers to your own work.

Exercise Answers

Coding Practice

To summarize what you have learned, and to prepare for the graded coding assignment, complete the following coding practice activity. Click the link to download a document and practice assigning ICD-10-CM codes according to the conventions.

Coding Practice

When you’re ready, click the link to check your answers.

Coding Practice Answers