What are the ICD 10 Codes for Type 2 Diabetes?

ICD-10-CM codes are a system used by doctors and healthcare professionals to code and classify symptoms, diagnoses, and procedures. The codes provide a level of detail that is essential for accuracy and specificity. 

Prior to the implementation of ICD-10-CM codes, the ICD-9-CM system was used. Both systems use unique alphanumeric codes to identify diseases and other health problems, as well as to help compile mortality and morbidity statistics. The system is published by the World Health Organization

ICD-10-CM codes are important as all Health Insurance Portability and Accountability Act-covered organizations must adhere to them. They also provide useful information about the severity of someone’s condition. 

Type 2 Diabetes ICD-10

A recent study found that ICD-10-CM coding changes that have recently been made for Type 2 diabetes have significantly improved coding for the condition, with the majority of codes sufficiently able to describe different diagnoses. The codes also represent an improvement over the ICD-9 system as rather than simply ‘controlled’ or ‘uncontrolled’ classifications, the system now has ‘inadequately controlled’, ‘out of control’ and ‘poorly controlled’ options. 

Categorizing diabetes in ICD-10-CM

Diabetes is classified as an ‘endocrine, nutritional or metabolic disease’. It’s different forms are listed under these primary categories:

  • E08: Diabetes mellitus due to underlying condition
  • E09: Drug or chemical induced diabetes mellitus
  • E10: Type 1 diabetes mellitus
  • E11: Type 2 diabetes mellitus
  • E13: Other specified diabetes mellitus

These categories are then divided into sub-categories, with codes used to specify characteristics of individual patient cases. 

Generally, diabetes ICD-10-CM codes are combinations of codes that identify the type of diabetes a patient has, any bodily systems that are affected, and any complications that have arisen. Let’s take an example.

If a diabetic patient has chronic diabetes-related kidney disease, at stage 3, takes insulin daily and has a diagnosis of Type 2 diabetes, their codes would look like this:

  • E11.22: Type 2 diabetes mellitus with diabetic chronic kidney disease
  • N18.3: Chronic kidney disease, stage 3 (moderate)
  • Z79.4: Long term (current) use of insulin

These codes help to specify the exact nature of the patient’s condition. Some types of diabetes have combination codes that cover all specifics of that type, and in these cases only one code is necessary. 

Coding in combination with other conditions

To be truly accurate when coding ICD-10-CM for diabetes, you must note any underlying conditions that have caused or are impacting the diabetes. Category E08 defines ‘diabetes due to underlying condition’ and so these conditions must be noted first.

The next category, E09, defines diabetes induced by drugs or chemicals – in these cases, the drug or chemical that has been determined as the cause should be noted first.

In cases of gestational diabetes (diabetes that manifests in pregnancy but goes into remission after birth), the code should include a final character that indicates the trimester of the pregnancy. This is important as poorly controlled Type 2 diabetes in the second and third trimesters of pregnancy can cause babies to be born at above-average birth weight, which is a risk to both mother and child.

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