Is T79.4XXA a billable ICD-10-CM code?

Yes. T79.4XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does T79.4XXA sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Certain early complications of trauma (T79).

What cannot be coded together with T79.4XXA?

T79.4XXA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T79.4XXA (T79.4) and apply to it just the same.

T79.4XXA

T79.4XXA — Traumatic shock, initial encounter

Billable / specific codeICD-10-CM

T79.4XXA is a billable, specific ICD-10-CM code for traumatic shock, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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 wordings a physician may use in the chart for this same code.

Shock (immediate) (delayed) following injury

Excludes1 inherited from the categories above T79.4XXA

These are not written on T79.4XXA, but they bind it: a note on a category applies to every code beneath it. Billing T79.4XXA with anything listed here is a denial.

Written on T79.4 — Traumatic shock

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)

Excludes2 inherited from the categories above T79.4XXA

Also inherited, and the opposite of Excludes1: these conditions are not part of T79.4XXA, but a patient can have both, so you may code both.

Written on T79 — Certain early complications of trauma, not elsewhere classified

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)

Risk adjustment

T79.4XXA risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 2 Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock0.500 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

T79.4XXA is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52868Billing and Coding: Transesophageal Echocardiography (TEE)
A56421Billing and Coding: CT of the Abdomen and Pelvis
A56500Billing and Coding: Cardiac Catheterization and Coronary Angiography
A56505Billing and Coding: Transesophageal Echocardiography (TEE)

Code history

T79.4XXA has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share T79.4. If T79.4XXA is not quite right, the correct code is usually one of these.

Questions about T79.4XXA

Is T79.4XXA a billable ICD-10-CM code?: Yes. T79.4XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T79.4XXA sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Certain early complications of trauma (T79).
What cannot be coded together with T79.4XXA?: T79.4XXA carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T79.4XXA (T79.4) and apply to it just the same.