T79.4XXA – Traumatic shock, initial encounter

ICD-10-CM 2027 diagnosis code · Certain early complications of trauma (T79)

Billable code

ICD-10-CM code T79.4XXA

Code: T79.4XXA (claims format: T794XXA)
Description: Traumatic shock, initial encounter
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: T79 Certain early complications of trauma (T79)
Parent codes: T79 › T79.4

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.

T79 – Certain early complications of trauma, not elsewhere classified

Excludes2 (not included here):

acute respiratory distress syndrome (J80)
complications occurring during or following medical procedures (T80-T88)
complications of surgical and medical care NEC (T80-T88)
newborn respiratory distress syndrome (P22.0)

7th character note:

The appropriate 7th character is to be added to each code from category T79

T79.4 – Traumatic shock

Applicable to:

Shock (immediate) (delayed) following injury

Excludes1 (not coded here):

anaphylactic shock due to adverse food reaction (T78.0-)
anaphylactic shock due to correct medicinal substance properly administered (T88.6)
anaphylactic shock due to serum (T80.5-)
anaphylactic shock NOS (T78.2)
electric shock (T75.4)
nontraumatic shock NEC (R57.-)
obstetric shock (O75.1)
postprocedural shock (T81.1-)
septic shock (R65.21)
shock complicating abortion or ectopic or molar pregnancy (O00-O07, O08.3)
shock due to anesthesia (T88.2)
shock due to lightning (T75.01)
shock NOS (R57.9)

Related codes in T79.4

T79.4XXD – Traumatic shock, subsequent encounterBillable
T79.4XXS – Traumatic shock, sequelaBillable

Frequently asked questions

What is ICD-10 code T79.4XXA?

T79.4XXA is the ICD-10-CM code for traumatic shock, initial encounter, in the block T79 (Certain early complications of trauma (T79)).

Is T79.4XXA a billable code?

Yes. T79.4XXA is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T79.4XXA belong to?

It belongs to category T79 – Certain early complications of trauma, 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.