T78.01XA vs T78.01XS
T78.01XA (Anaphylactic reaction due to peanuts, initial encounter) compared with T78.01XS (Anaphylactic reaction due to peanuts, sequela), from the official CMS tabular data. T78.01XA and T78.01XS code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T78.01XA and T78.01XS 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
| T78.01XAAnaphylactic reaction due to peanuts, initial encounter | T78.01XSAnaphylactic reaction due to peanuts, 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 | Anaphylactic reaction due to peanuts, initial encounter is a billable ICD-10-CM diagnosis code (T78.01A). | Anaphylactic reaction due to peanuts, sequela is a billable ICD-10-CM diagnosis code (T78.01S). |
| 7th character | The appropriate 7th character is to be added to each code from category T78 | The appropriate 7th character is to be added to each code from category T78 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources