Is K13 a billable ICD-10-CM code?

No. K13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does K13 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).

K13

K13 — Other diseases of lip and oral mucosa

Non-billable headerICD-10-CM

K13 is a non-billable header ICD-10-CM code for other diseases of lip and oral mucosa. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

certain disorders of gingiva and edentulous alveolar ridge (K05-K06)
cysts of oral region (K09.-)
diseases of tongue (K14.-)
stomatitis and related lesions (K12.-)

Use additional code

Add a secondary code to capture the detail described below.

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)
tobacco dependence (F17.-)
tobacco use (Z72.0)

Includes

Conditions this code covers.

epithelial disturbances of tongue

Other codes that can never be billed with K13

These codes carry an Excludes1 note pointing at K13. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading K13 alone.

L98.5Mucinosis of the skin
K12Stomatitis and related lesions
K13.2Leukoplakia and other disturbances of oral epithelium, including tongue
K13.21Leukoplakia of oral mucosa, including tongue

Risk adjustment

K13 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead K13

8 child codes. Green means billable.

Questions about K13

Is K13 a billable ICD-10-CM code?: No. K13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does K13 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).