ICDcodes.org
FY2027

T79.4XXA — Traumatic shock, initial encounter

BillableMCC

Is T79.4XXA billable?

Yes — T79.4XXA is billable for FY2027. T79.4XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T79.4XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.

T79.4XXA at a glance

CodeT79.4XXA
DescriptionTraumatic shock, initial encounter
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027
7th character "A"initial encounter

What does the 7th character "A" mean in T79.4XXA?

In T79.4XXA, the 7th character A means initial encounter. The 7th character is required for T79.4XXA to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does T79.4XXA group to?

T79.4XXA sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 791Prematurity with Major Problemsmedical

As a secondary diagnosis, T79.4XXA is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.

How is T79.4XXA listed in the Alphabetic Index?

The Alphabetic Index lists these routes under T79.4, the nearest indexed parent of T79.4XXA. Use them to find the family, then select the specific code.

  • Feeble rapid pulse due to shock following injury
  • Decrease › respiration, due to shock following injury (d)
  • Hypovolemia › traumatic
  • Pulse › feeble, rapid due to shock following injury
  • Rapid › feeble pulse, due to shock, following injury
  • Respiration › decreased due to shock, following injury
  • Shock › traumatic
  • Syndrome › shock

Excludes1 — never code together

The conditions below can never be reported together with T79.4XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • 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)

Inclusion terms

Alternative wording in documentation that is classified to T79.4XXA.

  • Shock (immediate) (delayed) following injury

Excludes1 — never code together — inherited from T79.4

The conditions below can never be reported together with T79.4XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • 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)

Use additional code — inherited from Chapter 19

Report an additional code alongside T79.4XXA to fully describe the condition. T79.4XXA is sequenced first.

  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T79.4XXA, but a patient may have both at the same time. When documentation supports it, T79.4XXA and the excluded code may both be reported.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from T79

The conditions below are not part of T79.4XXA, but a patient may have both at the same time. When documentation supports it, T79.4XXA and the excluded code may both be reported.

  • 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)

How long has T79.4XXA existed?

T79.4XXA has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.