T18
ICD-10Non-billable categoryForeign body in alimentary tract
Official ICD-10-CM descriptor (FY2026)
Foreign body in alimentary tract
T18 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- foreign body in pharynx (T17.2-)
7th character
- The appropriate 7th character is to be added to each code from category T18
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under T18
- T18.0Foreign body in mouthcategory
- T18.1Foreign body in esophaguscategory
- T18.2Foreign body in stomachcategory
- T18.3Foreign body in small intestinecategory
- T18.4Foreign body in coloncategory
- T18.5Foreign body in anus and rectumcategory
- T18.8Foreign body in other parts of alimentary tractcategory
- T18.9Foreign body of alimentary tract, part unspecifiedcategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.