T17.398A (Other foreign object in larynx causing other injury, initial encounter) compared with T17.398S (Other foreign object in larynx causing other injury, sequela), from the official CMS tabular data. T17.398A and T17.398S 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. T17.398A and T17.398S 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.
| T17.398AOther foreign object in larynx causing other injury, initial encounter | T17.398SOther foreign object in larynx causing other injury, sequela | |
|---|---|---|
| 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 | Other foreign object in larynx causing other injury, initial encounter is a billable ICD-10-CM diagnosis code (T17.398A). | Other foreign object in larynx causing other injury, sequela is a billable ICD-10-CM diagnosis code (T17.398S). |
| 7th character | The appropriate 7th character is to be added to each code from category T17 | The appropriate 7th character is to be added to each code from category T17 |
| 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