T78.19XD — Other adverse food reactions, not elsewhere classified, subsequent encounter
Is T78.19XD billable?
Yes, but T78.19XD is an unspecified code. T78.19XD is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T78.19XD 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 T78.19XD.
T78.19XD at a glance
| Code | T78.19XD |
|---|---|
| Description | Other adverse food reactions, not elsewhere classified, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in T78.19XD?
In T78.19XD, the 7th character D means subsequent encounter. The 7th character is required for T78.19XD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
What Medicare edits apply to T78.19XD?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name T78.19XD directly.
CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.
Which MS-DRGs does T78.19XD group to?
T78.19XD sits in MDC 23 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.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is T78.19XD listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T78.19, the nearest indexed parent of T78.19XD. Use them to find the family, then select the specific code.
- Allergy, allergic › foodNEC (reaction) (to)
- Effect, adverse › foodstuffs
- Syndrome › oral allergy
- Allergy, allergic › gastrointestinal › meaning other adverse food reaction not elsewhere classified (reaction) (to)
- Reaction › adverse › foodNEC
Excludes1 — never code together — inherited from T78.1
The conditions below can never be reported together with T78.19XD on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.19XD to fully describe the condition. T78.19XD is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T78.1
Report an additional code alongside T78.19XD to fully describe the condition. T78.19XD is sequenced first.
- code to identify the type of reaction, if applicable
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T78.19XD, but a patient may have both at the same time. When documentation supports it, T78.19XD and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.19XD, but a patient may have both at the same time. When documentation supports it, T78.19XD and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Excludes2 — not included here — inherited from T78.1
The conditions below are not part of T78.19XD, but a patient may have both at the same time. When documentation supports it, T78.19XD and the excluded code may both be reported.
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78.19XD 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 T78.19XD existed?
T78.19XD 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.