T28.6XXA (Corrosion of esophagus, initial encounter) compared with T28.6XXD (Corrosion of esophagus, subsequent encounter), from the official CMS tabular data. T28.6XXA and T28.6XXD 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. T28.6XXA and T28.6XXD 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.
| T28.6XXACorrosion of esophagus, initial encounter | T28.6XXDCorrosion of esophagus, subsequent encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Corrosion of esophagus, initial encounter is a billable ICD-10-CM diagnosis code (T28.6A). | Corrosion of esophagus, subsequent encounter is a billable ICD-10-CM diagnosis code (T28.6D). |
| 7th character | The appropriate 7th character is to be added to each code from category T28 | The appropriate 7th character is to be added to each code from category T28 |
| Use additional code | external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) external cause code to identify place (Y92) | external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) external cause code to identify place (Y92) |
| Code first | (T51-T65) to identify chemical and intent | (T51-T65) to identify chemical and intent |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources