We know that ICD 10 has many components to one code.  For example you may use this code when dealing with the oral cavity.

ICD-10-CM Code T18.0XXA does not contain any entries in the ICD-10-CM Alpha Tabular Index. However, its parent code T18.0 contains the following entries:

alimentary tract T18.9
mouth T18.0
entering through orifice
alveolar process T18.0
buccal cavity T18.0
gum T18.0
mouth T18.0
oral cavity T18.0
palate T18.0
tongue T18.0

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