T78.129S – Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela

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

Billable code

ICD-10-CM code T78.129S

Code: T78.129S (claims format: T78129S)
Description: Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela
Short description: Other ad food react d/t egg with bkd egg tol/rct, unsp, sqla
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 › T78.1 › T78.12 › T78.129

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

T78.1 – Other adverse food reactions, not elsewhere classified

Excludes1 (not coded here):

anaphylactic reaction or shock due to adverse food reaction (T78.0-)
anaphylactic reaction due to food (T78.0-)
bacterial food borne intoxications (A05.-)

Excludes2 (not included here):

allergic and dietetic gastroenteritis and colitis (K52.29)
allergic rhinitis due to food (J30.5)
dermatitis due to food in contact with skin (L23.6, L24.6, L25.4)
dermatitis due to ingested food (L27.2)
food protein-induced enterocolitis syndrome (K52.21)
food protein-induced enteropathy (K52.22)

Use additional code:

code to identify the type of reaction, if applicable

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 T78.129

Frequently asked questions

What is ICD-10 code T78.129S?

T78.129S is the ICD-10-CM code for other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified, sequela, in the block T66-T78 (Other and unspecified effects of external causes).

Is T78.129S a billable code?

Yes. T78.129S is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T78.129S 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.