2027 ICD-10-CM Diagnosis Code K09Cysts of oral region, not elsewhere classified

ICD-10-CM Codes›K00–K95›K00-K14›K09

ICD-10-CM K09
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K09 is a non-billable ICD-10-CM category code for cysts of oral region, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K09.0, K09.1, K09.8, and K09.9.

Code Identity

ICD-10-CM Code
K09
Billable Status
No — Non-Billable Category
Code Describes
Cysts of oral region, not elsewhere classified
Short Description
Cysts of oral region, not elsewhere classified
Same as the full description in the CMS dataset.
Chapter
K00-K14
Diseases of oral cavity and salivary glands

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK09Cysts of oral region, not elsewhere classified
This CodeK09Cysts of oral region, not elsewhere classified

Specific Coding for Cysts of oral region, not elsewhere classifiedOverview

Non-specific codes like K09 require more characters. Use one of these billable codes instead:

  • Use K09.0 for Developmental odontogenic cysts

  • Use K09.1 for Developmental (nonodontogenic) cysts of oral region

  • Use K09.8 for Other cysts of oral region, not elsewhere classified

  • Use K09.9 for Cyst of oral region, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K09: its own notes plus those printed at Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • lesions showing histological features both of aneurysmal cyst and of another fibro-osseous lesion

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On K09 itself
From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K09, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming K09: they are not reported together with it, unless the two conditions are unrelated.

  • M27.4 Other and unspecified cysts of jaw
    cysts of oral region (K09.-)

Excludes2 1

These codes carry an Excludes2 note naming K09: its condition is not part of those codes, and both may be reported when the patient has both.

  • K13 Other diseases of lip and oral mucosa
    cysts of oral region (K09.-)

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K09Overview

What is the ICD-10 code for cysts of oral region, not elsewhere classified?

K09 is the ICD-10-CM category for cysts of oral region, not elsewhere classified, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is K09 (Cysts of oral region, not elsewhere classified) a billable code?

No. This is a category header that groups the codes for cysts of oral region, not elsewhere classified, and headers cannot be submitted on claims. Claims for cysts of oral region, not elsewhere classified need a more specific code from this category, such as K09.0, K09.1, and K09.8.