T18.4XXD — Foreign body in colon, subsequent encounter
T18.4XXD is a billable, specific ICD-10-CM code for foreign body in colon, subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent encounter
The appropriate 7th character is to be added to each code from category T18
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
T18.4XXD does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
T18.4XXD is named in 7 Medicare coverage policies — 7 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55937Billing and Coding: Diagnostic Colonoscopy
- A56394Billing and Coding: Colonoscopy and Sigmoidoscopy-Diagnostic
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A57063Billing and Coding: Diagnostic and Therapeutic Esophagogastroduodenoscopy
Code history
T18.4XXD has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share T18.4. If T18.4XXD is not quite right, the correct code is usually one of these.
Questions about T18.4XXD
- Is T18.4XXD a billable ICD-10-CM code?
- Yes. T18.4XXD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T18.4XXD sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Effects of foreign body entering through natural orifice (T15-T19).