T18.0 Foreign body in mouth

The ICD-10-CM code for Foreign body in mouth is T18.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T15-T19: Effects of foreign body entering through natural orifice (T15-T19)

Category T18

21 codes (15 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to T18.0:

• Foreign body › entering through orifice › buccal cavity
• Foreign body › entering through orifice › alveolar process
• Foreign body › alimentary tract › mouth
• Foreign body › entering through orifice › oral cavity
• Foreign body › entering through orifice › tongue
• Foreign body › entering through orifice › palate
• Foreign body › entering through orifice › mouth
• Foreign body › entering through orifice › gum

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool