K12 is the authoritative medical code for Stomatitis and related lesions. This classification is used in medical billing and clinical recording to specify the clinical criteria for stomatitis and related lesions (ICD-10-CM K12), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Stomatitis and related lesions is a non-billable ICD-10-CM category code K12. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): cancrum oris A69.0; cheilitis K13.0; gangrenous stomatitis A69.0; herpesviral herpes simplex gingivostomatitis B00.2; noma A69.0. Use additional code: 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.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for K12 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- cancrum oris A69.0
- cheilitis K13.0
- gangrenous stomatitis A69.0
- herpesviral herpes simplex gingivostomatitis B00.2
- noma A69.0
Use Additional Code
Supplementary codes the tabular list directs you to add.
- 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
Frequently Asked Questions (FAQ) & Clinical Guidance
Can K12 be billed directly?
No. K12 (Stomatitis and related lesions) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with K12?
Per Excludes1 instructions, K12 must not be reported with: cancrum oris (A69.0); cheilitis (K13.0); gangrenous stomatitis (A69.0); herpesviral [herpes simplex] gingivostomatitis (B00.2).
Is an additional code needed with K12?
Use additional code(s) to specify: 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).
Codes in This Family (9)
Official ICD-10-CM classifications in the same code family as K12, with their registry titles.
- K12.0 — Recurrent oral aphthae
- K12.1 — Other forms of stomatitis
- K12.2 — Cellulitis and abscess of mouth
- K12.3 — Oral mucositis (ulcerative)
- K12.30 — Oral mucositis (ulcerative), unspecified
- K12.31 — Oral mucositis (ulcerative) due to antineoplastic therapy
- K12.32 — Oral mucositis (ulcerative) due to other drugs
- K12.33 — Oral mucositis (ulcerative) due to radiation
- K12.39 — Other oral mucositis (ulcerative)
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code K08
Other disorders of teeth and supporting structures