K13.0 Diseases of lips

ICD-10-CM K13.0: Diseases of lips

ICD-10-CM code K13.0 represents Diseases of lips and is used to document various conditions affecting the lip area. The code is located within the digestive system chapter under diseases of the oral cavity. Clinical literature indicates that lip diseases can manifest through inflammatory changes, dryness, or lesions, which may require differential diagnosis from other oral mucosal conditions. 3 2 1

Plain-language overview

Diseases of the lips can involve inflammatory changes, color changes, or physical alterations like swelling and thickening. These conditions may present as dryness, ulcers, or erosions on the upper or lower lip, affecting individuals exposed to various environmental factors. 2 1

What this code represents

K13.0 is a billable diagnosis code with no child codes, used to specify diseases of lips. Its inclusion terms encompass Abscess of lips, Angular cheilitis, Cellulitis of lips, Cheilitis NOS, Cheilodynia, Cheilosis, and Exfoliative cheilitis, among others. 3

Coding details

In the ICD-10-CM hierarchy, K13.0 falls under category K13 for other diseases of lip and oral mucosa, within the K00-K14 section for diseases of the oral cavity and salivary glands. This code has no listed code first or use additional code instructions. 3 4

K13.0 carries Excludes1 notes for conditions such as ariboflavinosis, congenital fistula of lips, and Perlèche due to candidiasis. These excluded conditions must be coded to their specific respective categories instead of K13.0. 3

Documentation considerations

Clinical evaluation of lip diseases may identify signs such as red or white patches, numbness, tingling, or difficulty moving the lips. Documenting specific clinical features like crusting, scaling, or peeling present for extended periods helps distinguish inflammatory lip conditions from other oral mucosal diseases. 1 2

Clinical context

Chronic cheilitis represents a spectrum of inflammatory changes of unknown etiology affecting the vermilion of the lips. External factors like windy weather or lip biting can promote dehydration, making the vermilion appear similar to chronic cheilitis, while allergic diseases and anemia are identified as risk factors. 2

What the sources add

While S3 establishes K13.0 as a specific billable code for general lip diseases, S5 clarifies that for the specific presentation of swollen lips, coders must differentiate between K13.0 and R13.0 depending on the exact clinical documentation. 3 5

Clinical research sources S1 and S2 provide context on the physical manifestations and risk factors of lip conditions, whereas coding references S3 and S4 define the structural classification and inclusion terms of K13.0 without detailing clinical presentations. 1 2 3 4

Sources

1. Evaluation of lip diseases in peddlers on two beaches of Guarujá/Brazil: An observational study — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Analysis of clinical presentations, lip transepidermal water loss and associated dermatological conditions in patients with chronic cheilitis — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. ICD-10-CM K13.0: Diseases of lips | Vero — veroscribe.com; accessed 2026-07-25.
4. K13.0 - Diseases of lips | ICD-10-CM — unboundmedicine.com; accessed 2026-07-25.
5. What is the appropriate ICD‑10 code for swollen lips? — droracle.ai; accessed 2026-07-25.