T78.079S — Anaphylactic reaction due to milk and dairy products, unspecified, sequela
Is T78.079S billable?
Yes, but T78.079S is an unspecified code. T78.079S is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T78.079S is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T78.079S — the more specific alternatives are listed below.
T78.079S at a glance
| Code | T78.079S |
|---|---|
| Description | Anaphylactic reaction due to milk and dairy products, unspecified, 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 T78.079S?
In T78.079S, the 7th character S means sequela. The 7th character is required for T78.079S to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T78.079S group to?
T78.079S 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 T78.079S listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T78.079, the nearest indexed parent of T78.079S. Use them to find the family, then select the specific code.
- Allergy, allergic › dairy products › anaphylactic reaction (reaction) (to)
- Allergy, allergic › milk protein › anaphylactic reaction (reaction) (to)
- Shock › anaphylactic › due to food › dairy products
- Shock › anaphylactic › due to food › milk
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.079S to fully describe the condition. T78.079S 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 T78.079S, but a patient may have both at the same time. When documentation supports it, T78.079S and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.079S, but a patient may have both at the same time. When documentation supports it, T78.079S 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 T78.079S 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 T78.079S existed?
T78.079S first appears in FY2026.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.