ICD Coding

International Classification of Diseases (ICD) is a system of diagnostic codes for classifying diseases. It is published by the World Health Organization, and used world-wide for morbidity and mortality statistics, and reimbursement systems. The ICD is revised periodically, and is currently under its 10th revision, ICD-10. On January 1, 1999 the US adopted ICD-10 coding for mortality reporting (death certificates). The transition for clinical morbidity coding was slower. The American medical system officially transitioned from ICD-9-CM to ICD-10-CM on October 1, 2015. Use caution when using data based on ICD coding which spans these dates.

ICD coding for morbidity and mortality differ slightly, but both are based on a hierarchical structure, where major categories of diseases are grouped together.

ICD-9 and ICD-10 reference tables are provided below, and can be used to see a list of possible ICD codes that are included in data presented on the portal.

ICD-9 Reference Table

The ICD-9-CM Table provides the following details:

  1. ICD-9-CM Code
  2. Diagnosis Description
  3. Diagnosis Category 1
  4. Diagnosis Category 2
  5. Diagnosis Category 3

Step 1: Filter by the Diagnosis Category 2 from the report.

Step 2: Use the other columns to see possible ICD-9-CM codes and their descriptions, Diagnosis Category 1, and Diagnosis Category 3 for the selected Diagnosis Category 2. You will not be able to know exactly which diagnoses occurred, but will see examples of possible diagnoses for the selected Diagnosis Category 2.

ICD-10 Reference Table

The ICD-10 Table provides the following details for the Cause of Death (Cod):

  1. ICD-10 Code
  2. ICD Title
  3. Cod (Cause of Death) Level 1 Description
  4. Cod (Cause of Death) Level 2 Description
  5. Cod (Cause of Death) 113 Group Description
  6. Chapter Number (ICD-10)
  7. Block Range (ICD-10)
  8. Chapter Description (ICD-10)

Step 1: Filter by the Cod Level 2 Description from the report.

Step 2: Use the other columns to see possible ICD-10 codes and their descriptions, Cod Level 1 Description, Cod 113 Group Description, ICD-10 Chapter Number, ICD-10 Block Range, and ICD-10 Chapter Description for the selected Cod Level 2 Description. You will not be able to know exactly which Cause of Death occurred, but will see examples of possible causes for the selected Cod Level 2 Description.​