2027 ICD-10-CM Diagnosis Code T18.3XXSForeign body in small intestine, sequela
T18.3XXS is a billable ICD-10-CM diagnosis code for foreign body in small intestine, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 913 through 914. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T18.3XXS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Effects of foreign body entering through natural orifice (T15-T19).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bezoar in intestine
- Enteritis of small intestine caused by foreign body
- Foreign body at terminal ileum
- Foreign body in duodenum
- Foreign body in ileum
- Foreign body in intestine and colon
- Foreign body in jejunum
- Foreign body in small intestine
- Intestinal trichobezoar
- Trichobezoar
- Ulcer of small intestine caused by foreign body
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Foreign body in alimentary tract (T18). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to T18.3XXS: its own notes plus those printed at T18, block T15-T19, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if known, for foreign body entering into or through a natural orifice (W44.-)
- code to identify any retained foreign body, if applicable (Z18.-)
Notes
General instructions on how these codes are used.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- The appropriate 7th character is to be added to each code from category T18
- Ainitial encounter
- Dsubsequent encounter
- Ssequela this code
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name T18.3XXS, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming T18.3XXS: its condition is not part of those codes, and both may be reported when the patient has both.
- Z03.82 Encounter for observation for suspected foreign body ruled outforeign body in alimentary tract (T18) names T18, which includes this code
- Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index; each main term links to its index entry.
- Aspiration
- food (any type) (into respiratory tract) (with asphyxia, obstruction respiratory tract, suffocation)
- Choked, choking (on) (any object except food or vomitus)
- food (bone) (seed)
- Compression
- trachea by
- food (lodged in esophagus)
- Food (any type) in
- air passages (with asphyxia, obstruction, or suffocation)
- Food (any type) in
- alimentary tract causing asphyxia (due to compression of trachea)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Foreign Bodies
If you've ever gotten a splinter or had sand in your eye, you've had experience with a foreign body. A foreign body is something that is stuck inside you but isn't supposed to be there. You may inhale or swallow a foreign body, or you may get one from an injury to almost any part of your body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T18.3XXS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T18.3XXSOverview
What is the ICD-10 code for foreign body in small intestine, sequela?
The ICD-10-CM code for foreign body in small intestine, sequela is T18.3XXS (sometimes written as T183XXS). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is T18.3XXS (Foreign body in small intestine) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report foreign body in small intestine, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character S in T18.3XXS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the foreign body in small intestine itself has resolved, not the original event.
What MS-DRG does T18.3XXS group to?
When foreign body in small intestine, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 914, 913, with relative weights from 0.9281 to 1.5448 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T18.3XXS exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for foreign body in small intestine, sequela on inpatient claims. The code appears in the Effects of foreign body entering through natural orifice (T15-T19) range of the CMS exempt list.
