T34.40XA vs T34.40XS
T34.40XA (Frostbite with tissue necrosis of unspecified arm, initial encounter) compared with T34.40XS (Frostbite with tissue necrosis of unspecified arm, sequela), from the official CMS tabular data. T34.40XA and T34.40XS code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T34.40XA and T34.40XS 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.
Side by side
| T34.40XAFrostbite with tissue necrosis of unspecified arm, initial encounter | T34.40XSFrostbite with tissue necrosis of unspecified arm, sequela | |
|---|---|---|
| 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 | Frostbite with tissue necrosis of unspecified arm, initial encounter is a billable ICD-10-CM diagnosis code (T34.40A). | Frostbite with tissue necrosis of unspecified arm, sequela is a billable ICD-10-CM diagnosis code (T34.40S). |
| 7th character | The appropriate 7th character is to be added to each code from category T34 | The appropriate 7th character is to be added to each code from category T34 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources