ICD-10-CM 2027
ICD-10 code for alimentary tract foreign body
From the official ICD-10-CM alphabetic index entry “Foreign body › alimentary tract”. Page updated September 29, 2026.
About coding alimentary tract foreign body
The ICD-10-CM code for alimentary tract foreign body is T18.9 (Foreign body of alimentary tract, part unspecified). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T18.9.
Within T18, choose T18.9 (of alimentary tract, part unspecified) only when documentation doesn't support a more specific option: in mouth (T18.0), in esophagus (T18.1), in stomach (T18.2), in small intestine (T18.3), in colon (T18.4), in anus and rectum (T18.5) and in other parts of alimentary tract (T18.8).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific alimentary tract foreign body codes (official index)
- anus T18.5 — Foreign body in anus and rectum
- colon T18.4 — Foreign body in colon
- esophagus
- mouth T18.0 — Foreign body in mouth
- multiple sites T18.8 — Foreign body in other parts of alimentary tract
- rectosigmoid (junction) T18.5 — Foreign body in anus and rectum
- rectum T18.5 — Foreign body in anus and rectum
- small intestine T18.3 — Foreign body in small intestine
- specified site NEC T18.8 — Foreign body in other parts of alimentary tract
- stomach T18.2 — Foreign body in stomach
Common questions about alimentary tract foreign body ICD-10 codes
What is the ICD-10 code for alimentary tract foreign body?
- T18.9 — Foreign body of alimentary tract, part unspecified (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T18.5, T18.4, T18.0, T18.8 and others below.
What is the ICD-10 code for anus alimentary tract foreign body?
- T18.5 — Foreign body in anus and rectum (header code; choose a more specific subcode).
What is the ICD-10 code for colon alimentary tract foreign body?
- T18.4 — Foreign body in colon (header code; choose a more specific subcode).
What is the ICD-10 code for mouth alimentary tract foreign body?
- T18.0 — Foreign body in mouth (header code; choose a more specific subcode).
What is the ICD-10 code for multiple sites alimentary tract foreign body?
- T18.8 — Foreign body in other parts of alimentary tract (header code; choose a more specific subcode).
What is the ICD-10 code for rectosigmoid alimentary tract foreign body?
- T18.5 — Foreign body in anus and rectum (header code; choose a more specific subcode).
What is the ICD-10 code for rectum alimentary tract foreign body?
- T18.5 — Foreign body in anus and rectum (header code; choose a more specific subcode).
Is T18.9 billable?
- No. T18.9 is a header code. Report one of its more specific subcodes instead.