T78.02XS — Anaphylactic reaction due to shellfish (crustaceans), sequela
Is T78.02XS billable?
Yes — T78.02XS is billable for FY2027. T78.02XS is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T78.02XS may be submitted for encounters from October 1, 2026 through September 30, 2027.
T78.02XS at a glance
| Code | T78.02XS |
|---|---|
| Description | Anaphylactic reaction due to shellfish (crustaceans), sequela |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "S" | sequela |
What does the 7th character "S" mean in T78.02XS?
In T78.02XS, the 7th character S means sequela. The 7th character is required for T78.02XS to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T78.02XS group to?
T78.02XS sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 922Other Injury, Poisoning and Toxic Effect Diagnoses with MCCmedical
- 923Other Injury, Poisoning and Toxic Effect Diagnoses without MCCmedical
How is T78.02XS listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T78.02, the nearest indexed parent of T78.02XS. Use them to find the family, then select the specific code.
- Shock › anaphylactic › due to food › fish › shellfish
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.02XS to fully describe the condition. T78.02XS is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T78.02XS, but a patient may have both at the same time. When documentation supports it, T78.02XS and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.02XS, but a patient may have both at the same time. When documentation supports it, T78.02XS and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78.02XS is sequenced first depends on the reason for the encounter.
- , if applicable, place of occurrence, such as:
- highway rest stop (Y92.523)
- school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
- service areas as the place of occurrence of the external cause (Y92.52-)
- single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
- transport vehicle as the place of occurrence of the external cause (Y92.81-)
How long has T78.02XS existed?
T78.02XS has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.