T18.5XXA (Foreign body in anus and rectum, initial encounter) compared with T18.5XXD (Foreign body in anus and rectum, subsequent encounter), from the official CMS tabular data. T18.5XXA and T18.5XXD code the same injury at a different phase of treatment. MedCoder-derived
Same underlying diagnosis, different encounter phase.
The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.
Source: ICD-10-CM Official Guidelines, Section I.C.19.a
Same injury, other encounter phase. T18.5XXA and T18.5XXD code the same injury at a different phase of treatment, set by the 7th character.
The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.
| T18.5XXAForeign body in anus and rectum, initial encounter | T18.5XXDForeign body in anus and rectum, subsequent encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, poisoning and certain other consequences of external causes | S00-T88 — Injury, poisoning and certain other consequences of external causes |
| Definition | Foreign body in anus and rectum, initial encounter is a billable ICD-10-CM diagnosis code (T18.5A). | Foreign body in anus and rectum, subsequent encounter is a billable ICD-10-CM diagnosis code (T18.5D). |
| 7th character | The appropriate 7th character is to be added to each code from category T18 | The appropriate 7th character is to be added to each code from category T18 |
| Includes | Foreign body in rectosigmoid (junction) | Foreign body in rectosigmoid (junction) |
| Use additional code | code, if known, for foreign body entering into or through a natural orifice (W44.-) | code, if known, for foreign body entering into or through a natural orifice (W44.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources