2026 ICD-10-CM Diagnosis Code K13.6Irritative hyperplasia of oral mucosa
ICD-10-CM Codes›K00–K95›K00-K14›K13
- Billable — Valid for Submission
- Chronic Condition
K13.6 is a billable ICD-10-CM diagnosis code for irritative hyperplasia of oral mucosa. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 157 through 159. Coders also document this condition as inflammatory fibroepithelial hyperplasia of oral mucous membrane. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Diseases of mouth; excluding dental, and Nontraumatic dental conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Inflammatory fibroepithelial hyperplasia of oral mucous membrane
- Inflammatory fibroepithelial hyperplasia of oral mucous membrane caused by denture
- Irritative hyperplasia of oral mucosa
- Leaf-shaped fibroma of oral mucosa
- Papillary hyperplasia of oral mucosa
- Papillary hyperplasia of palate
- Verrucous hyperplasia of oral mucosa
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 2 Excludes
- irritative hyperplasia of edentulous ridge [denture hyperplasia] K06.2
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Mouth Disorders
Your mouth is one of the most important parts of your body. It has many different functions. It allows you to:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K13.6 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K13.6Overview
What is the ICD-10 code for irritative hyperplasia of oral mucosa?
The ICD-10-CM code for irritative hyperplasia of oral mucosa is K13.6 (sometimes written as K136). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K13.6 (Other diseases of lip and oral mucosa) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report irritative hyperplasia of oral mucosa on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K13.6 group to?
When irritative hyperplasia of oral mucosa is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 157, 158, 159, with relative weights from 0.7085 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of K13.6?
Under the General Equivalence Mappings, irritative hyperplasia of oral mucosa converts to ICD-9-CM 528.9 (oral soft tissue dis NEC). The mapping is approximate, so confirm the match fits the documentation.
