T34.539A vs T34.539S
T34.539A (Frostbite with tissue necrosis of unspecified finger(s), initial encounter) compared with T34.539S (Frostbite with tissue necrosis of unspecified finger(s), sequela), from the official CMS tabular data. T34.539A and T34.539S code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T34.539A and T34.539S 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
| T34.539AFrostbite with tissue necrosis of unspecified finger(s), initial encounter | T34.539SFrostbite with tissue necrosis of unspecified finger(s), 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 finger(s), initial encounter is a billable ICD-10-CM diagnosis code (T34.539A). | Frostbite with tissue necrosis of unspecified finger(s), sequela is a billable ICD-10-CM diagnosis code (T34.539S). |
| 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