T78.05XA ICD-10-CM Code: Anaphylactic reaction due to tree nuts and seeds, initial encounter
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 915 — ALLERGIC REACTIONS WITH MCC (MDC 21)
- MS-DRG 916 — ALLERGIC REACTIONS WITHOUT MCC (MDC 21)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T78.05XA in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- anaphylactic reaction due to peanuts (T78.01)
- complications of surgical and medical care NEC (T80-T88)
Code Also
Additional codes that may be required to fully describe the encounter.
- Code also, 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-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Does T78.05XA require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T78.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T78.05XA in its code family, with their registry titles.
- T78.04 — Anaphylactic reaction due to fruits and vegetables
- T78.04XA — Anaphylactic reaction due to fruits and vegetables, initial encounter
- T78.04XD — Anaphylactic reaction due to fruits and vegetables, subsequent encounter
- T78.04XS — Anaphylactic reaction due to fruits and vegetables, sequela
- T78.05 — Anaphylactic reaction due to tree nuts and seeds
- T78.05XD — Anaphylactic reaction due to tree nuts and seeds, subsequent encounter
- T78.05XS — Anaphylactic reaction due to tree nuts and seeds, sequela
- T78.06 — Anaphylactic reaction due to food additives
- T78.06XA — Anaphylactic reaction due to food additives, initial encounter
- T78.06XD — Anaphylactic reaction due to food additives, subsequent encounter