K13Other diseases of lip and oral mucosa

K13 is the ICD-10-CM diagnosis code for other diseases of lip and oral mucosa. It belongs to block K00-K14 (diseases of oral cavity and salivary glands) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: K13.0 (lips), K13.1 (biting), K13.2 (tongue), K13.3 (leukoplakia), K13.4 (mucosa), K13.5 (fibrosis), K13.6 (mucosa) and K13.7 (mucosa).

The conditions in its Excludes2 note aren't part of K13, but may be coded alongside it if the patient has both: certain disorders of gingiva and edentulous alveolar ridge (K05-K06), cysts of oral region (K09.-), diseases of tongue (K14.-) and stomatitis and related lesions (K12.-).

Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.