Final answer:
ICD-10 has two types of Excludes: Excludes1 and Excludes2. Excludes1 indicates that the code excluded should never be used at the same time as the code listing the Excludes1 note. Excludes2 indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time.
Step-by-step explanation:
ICD-10 has two types of Excludes: Excludes1 and Excludes2.
Excludes1 indicates that the code excluded should never be used at the same time as the code listing the Excludes1 note. An Excludes1 note is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition. For example, the Excludes1 note for 'Type 1 diabetes mellitus' states that it should not be used with codes for 'transitory neonatal diabetes mellitus' (P70.2) or 'gestational diabetes' (O24.4).
Excludes2 indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate. For example, the Excludes2 note for 'type 2 diabetes mellitus' states that it is not to be used with codes for 'diabetes' (E08-E13) or 'latent autoimmune diabetes' (E10.9).