T78.05XS – Anaphylactic reaction due to tree nuts and seeds, sequela

ICD-10-CM 2027 diagnosis code · Other and unspecified effects of external causes

Billable code

ICD-10-CM code T78.05XS

Code: T78.05XS (claims format: T7805XS)
Description: Anaphylactic reaction due to tree nuts and seeds, sequela
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: T66-T78 Other and unspecified effects of external causes
Parent codes: T78 › T78.0 › T78.05

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

T78 – Adverse effects, not elsewhere classified

Excludes2 (not included here):

complications of surgical and medical care NEC (T80-T88)

7th character note:

The appropriate 7th character is to be added to each code from category T78

T78.0 – Anaphylactic reaction due to food

Applicable to:

Anaphylactic reaction due to adverse food reaction
Anaphylactic shock or reaction due to nonpoisonous foods
Anaphylactoid reaction due to food

T78.05 – Anaphylactic reaction due to tree nuts and seeds

Excludes2 (not included here):

anaphylactic reaction due to peanuts (T78.01)

Block T66-T78

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-)

Related codes in T78.05

Frequently asked questions

What is ICD-10 code T78.05XS?

T78.05XS is the ICD-10-CM code for anaphylactic reaction due to tree nuts and seeds, sequela, in the block T66-T78 (Other and unspecified effects of external causes).

Is T78.05XS a billable code?

Yes. T78.05XS is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T78.05XS belong to?

It belongs to category T78 – Adverse effects, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.