2027 ICD-10-CM Diagnosis Code T18.5XXSForeign body in anus and rectum, sequela

ICD-10-CM Codes›S00–T88›T15-T19›T18

ICD-10-CM T18.5XXS
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T18.5XXS is a billable ICD-10-CM diagnosis code for foreign body in anus and rectum, 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. Coders also document this condition as foreign body in anus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
T18.5XXS
Billable Status
Yes — Valid for Submission
Code Describes
Foreign body in anus and rectum, sequela
Short Description
Foreign body in anus and rectum, sequela
Same as the full description in the CMS dataset.
Parent Code
T18.5
Foreign body in anus and rectum

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT15-T19Effects of foreign body entering through natural orifice
CategoryT18Foreign body in alimentary tract
This CodeT18.5XXSForeign body in anus and rectum, sequela

Present on Admission (POA)Billing

T18.5XXS 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.

  • Foreign body in anus
  • Foreign body in anus and rectum
  • Foreign body in colon
  • Foreign body in rectosigmoid junction
  • Foreign body in rectum
  • Foreign body in sigmoid colon
  • Foreign body of large intestine

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 T18.5XXS: 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.

From T18 Foreign body in alimentary tract applies to 45 codes
  • foreign body in pharynx (T17.2-)
From Block T15-T19 Effects of foreign body entering through natural orifice applies to 261 codes
  • foreign body accidentally left in operation wound (T81.5-)
  • foreign body in penetrating wound - See open wound by body region
  • residual foreign body in soft tissue (M79.5)
  • splinter, without open wound - See superficial injury by body region
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block T15-T19 Effects of foreign body entering through natural orifice applies to 261 codes
  • code, if known, for foreign body entering into or through a natural orifice (W44.-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From T18 Foreign body in alimentary tract applies to 45 codes
  • The appropriate 7th character is to be added to each code from category T18
Values for category T18 Encounter: Initial, Subsequent, Sequela
  • 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 T18.5XXS, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming T18.5XXS: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block S30-S39 Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
    effects of foreign body in anus and rectum (T18.5) names T18.5, which includes this code
  • Z03.82 Encounter for observation for suspected foreign body ruled out
    foreign body in alimentary tract (T18) names T18, which includes this code

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)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

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 T18.5XXS to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
908.5 Late eff FB in orifice
Approximate The match is approximate rather than exact.

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 T18.5XXSOverview

What is the ICD-10 code for foreign body in anus and rectum, sequela?

The ICD-10-CM code for foreign body in anus and rectum, sequela is T18.5XXS (sometimes written as T185XXS). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T18.5XXS (Foreign body in anus and rectum) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report foreign body in anus and rectum, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character S in T18.5XXS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the foreign body in anus and rectum itself has resolved, not the original event.

What MS-DRG does T18.5XXS group to?

When foreign body in anus and rectum, 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 T18.5XXS 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 anus and rectum, 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.