ICD-10 code S06.358A: Traumatic hemorrhage of left cerebrum

Key takeaways

ICD-10 code S06.358A covers traumatic hemorrhage of the left cerebrum with loss of consciousness of any duration, ending in death from a separate cause.

The code is billable for FY2026, effective October 1, 2025, and the 7th character A marks the initial encounter.

S06.357A and S06.358A are both fatal codes, and the cause of death is what separates them.

Four elements must appear in the record: left-side laterality, a traumatic mechanism, documented loss of consciousness, and death from another cause.

Practice management software like Pabau helps coding teams capture that documentation at the point of care, before the chart closes.

ICD-10 code S06.358A is a billable ICD-10-CM diagnosis code for traumatic hemorrhage of the left cerebrum. It applies when loss of consciousness of any duration ended in death from a separate cause before consciousness returned. The code became effective on October 1, 2025, with the FY2026 ICD-10-CM edition.

S06.358A sits inside category S06, intracranial injury, within chapter S00-T88 for injury and poisoning. This guide covers the code hierarchy, the three 7th-character options, and the documentation each descriptor element needs. It closes with a worked coding scenario and the errors that trigger denials.

ICD-10 code S06.358A: Definition and clinical description

S06.358A describes one narrow clinical picture. The patient has a traumatic left cerebral hemorrhage, loses consciousness for any length of time, and dies of a separate cause before waking. The Centers for Medicare and Medicaid Services (CMS) and the National Center for Health Statistics (NCHS) maintain the code.

What makes it unusual is the mortality qualifier built into the descriptor. Most TBI codes in the S06 category stop at injury severity and loss-of-consciousness duration. S06.357A and S06.358A go further, and both require death before consciousness returned. The pair then splits on what caused that death.

Coders in emergency and trauma settings meet S06.358A most often. It usually travels with injury codes describing the separate fatal mechanism. Milder head injuries from the same S06 category reach sports medicine practices too, though never with this descriptor.

Four terms in and around this descriptor decide which code you land on:

• Cerebrum: the main upper part of the brain, divided into left and right hemispheres. The S06.35x group covers the left hemisphere only.
• Loss of consciousness (LOC): the documented period a patient is unresponsive. Duration does not change the code here, but the record still has to state that LOC occurred.
• Sequela: a late effect of the original injury rather than the injury itself. It takes 7th character S instead of A.
• NOS (not otherwise specified): the ICD-10-CM annotation for unspecified. It routes you to a code such as S06.359A when the record leaves the LOC outcome open.

ICD-10-CM code hierarchy: Where S06.358A sits

S06.358A sits at the bottom of a five-level chain that starts with chapter S00-T88. The S06 category holds every intracranial injury code, and S06.3 narrows that to focal traumatic brain injury. The table below traces each level down to the billable code.

Because S06.3 covers focal traumatic brain injury rather than diffuse injury, S06.358A is wrong for a hemorrhage crossing both hemispheres. The same applies when laterality is genuinely unspecified in the record. Working down the parent codes in order keeps denial risk down.

To confirm a level, run an ICD-10 code lookup in the CDC/NCHS ICD-10-CM web tool. It shows the includes and excludes notes at every step of the S06 tabular list, without hiding them behind a hover.

7th character extensions for S06.358

The parent code S06.358 needs a 7th character before it is billable, and three extensions are valid. Any other character, or none at all, makes the claim invalid under the ICD-10-CM Official Coding Guidelines.

For S06.358A, the initial encounter designation covers the first episode of active clinical management. That might be the emergency department, the operating room, or an inpatient bed.

Because the descriptor already includes death before consciousness returned, S06.358A rarely appears on an outpatient follow-up claim. S06.358S is rarer still, since a sequela code assumes a patient who lived long enough to have one. Late effects of survivable brain injuries are usually documented by physical therapy teams in rehabilitation.

Related ICD-10-CM codes in the S06.35 group

The S06.35 group covers traumatic hemorrhage of the left cerebrum across every loss-of-consciousness threshold. Picking the wrong sibling from this group is the most common LOC error in TBI billing. The table below shows all of them, with S06.358A marked for reference.

For right-side laterality, the equivalent group is S06.34 (S06.340A through S06.349A). Unspecified laterality routes to S06.36. Verify laterality from the imaging report or the attending physician’s note before assigning any S06.35x code, and query the physician when left-side confirmation is missing.

There is no single ICD-10 acquired brain injury code, because acquired brain injury is a clinical umbrella term rather than an ICD-10-CM heading. Traumatic causes land in the S06 category. Non-traumatic causes, such as anoxic or hemorrhagic events, land in chapter IX instead.

The documented mechanism decides which chapter you code from. A medical coding cheat sheet is a quick way to keep those chapter boundaries straight at the desk.

Documentation requirements for S06.358A

The medical record has to support all four of the code’s clinical qualifiers before a coder assigns it. Miss one and the code becomes unsupportable, which is what creates audit exposure. The ICD-10-CM Official Guidelines, maintained jointly by CMS and NCHS, require the treating clinician to document the diagnosis clearly.

• Confirmed left-side laterality: the CT or MRI report must identify the hemorrhage as left cerebral, or the attending physician’s note must say “left.” Bilateral or unspecified findings need a physician query first.
• Traumatic mechanism: the hemorrhage must follow trauma such as a fall, a motor vehicle collision, or an assault. Spontaneous rupture is coded in the I61.x range instead, so the note must state the mechanism.
• Loss of consciousness of any duration: LOC has to appear in the record, and nobody can assume it happened. A neuro checks assessment gives nursing staff a fixed place to log consciousness level over time.
• Death from a separate cause before regaining consciousness: the record must name a concurrent or secondary fatal mechanism. Hemorrhagic shock and cardiac arrest from polytrauma are the usual ones. The note also has to show that this separate cause, rather than the brain injury, ended the patient’s life.

Coders supporting trauma teams get further with a documentation checklist that prompts the attending physician on each of those four elements. Facilities handling complex TBI cases often use digital intake forms to standardize what the record captures. That cuts the number of post-discharge queries a coder has to raise.

Billing and reimbursement considerations for TBI claims

S06.358A is fully billable for FY2026. It reaches payers almost only through inpatient and emergency department claims, because the death-before-consciousness scenario does not occur in outpatient care. Every brain injury ICD-10 code in this family carries the same payer expectations.

• Principal diagnosis sequencing: when S06.358A reflects the injury that occasioned the admission, it sequences as the principal diagnosis. It drops to a secondary diagnosis if the patient was admitted for a different complaint and the TBI was incidental. That is rare in this scenario.
• External cause codes: ICD-10-CM guidelines expect an external cause code from the V, W, X, or Y series alongside S06.358A. A motor vehicle collision takes the matching V-code. A fall takes the appropriate fall ICD-10 code from the W00-W19 range.
• Traumatic vs. non-traumatic distinction: payers reject claims where the narrative describes a spontaneous bleed but the coder assigned S06.358A. Non-traumatic cerebral hemorrhage is coded I61.x. Crossing the two categories is the single largest denial driver for this code group.
• Place of service: hospital inpatient (POS 21) and emergency department (POS 23) are the expected settings. Verify payer-specific documentation requirements before submitting from any other facility type.

Polytrauma admissions rarely carry a single injury code. A spinal injury takes its own code, such as S23.110A. Vascular injuries follow the S25 series, where a subsequent-encounter code such as S25.111D covers later care.

Common coding errors to avoid

TBI codes in the S06.3 category produce the same handful of errors year after year. Knowing where coders go wrong keeps the claim in step with the documentation. Practices running structured clinical record systems that flag coding conflicts at entry catch most of them before the claim leaves.

• Wrong laterality: assigning S06.358A when the hemorrhage is documented as right-sided, which is S06.348A, or as bilateral or unspecified. Always trace laterality back to the imaging report.
• Missing 7th character: submitting the parent code S06.358 without the A, D, or S extension. The parent code is not billable and rejects at the clearinghouse.
• Confusing S06.357A and S06.358A: both are fatal codes covering left-side traumatic hemorrhage with LOC of any duration and death before consciousness returned. The cause of death decides between them. Use S06.357A when the brain injury itself was fatal, and S06.358A when a separate injury or event caused the death.
• Applying S06.358A to non-traumatic hemorrhage: cerebrovascular hemorrhage (I61.x) and traumatic hemorrhage (S06.358A) are mutually exclusive. A record mentioning hypertensive intracerebral hemorrhage rules S06.358A out, whatever the LOC documentation says.
• Omitting the external cause code: ICD-10-CM guidelines expect an applicable external cause code with every traumatic injury code. Leaving it off rarely causes outright rejection, but it raises audit risk and invites payer requests for records.

Coding scenario: S06.358A in practice

Applying ICD-10 code S06.358A correctly means every clinical element is present and traceable in the record. The scenario below runs the coding logic step by step.

Clinical scenario: a 52-year-old man arrives in the ED after a high-speed motor vehicle collision. CT head shows a left cerebral hemorrhage, and he is unconscious on arrival. He goes to the OR for emergency management of a ruptured spleen. He dies there of hemorrhagic shock from the splenic injury, without regaining consciousness.

1. Confirm laterality: the CT report documents “left cerebral hemorrhage.” Laterality is confirmed as left, so the S06.35x group applies.
2. Confirm traumatic mechanism: the motor vehicle collision is the documented mechanism. Traumatic S06 codes apply, not spontaneous I61.x codes.
3. Confirm LOC: the patient was unconscious on arrival and stayed unconscious. LOC of any duration is documented.
4. Confirm the cause of death: the patient died of hemorrhagic shock from the splenic injury, not from the cerebral hemorrhage. He never regained consciousness. A separate cause of death is what confirms S06.358A over S06.357A.
5. Assign the 7th character: this is the first and only active encounter. Character A for initial encounter applies, giving S06.358A.
6. Add the external cause code: the patient was driving, so the V-code is V49.40XA. That covers a driver injured in a collision with an unspecified motor vehicle in a traffic accident.
7. Sequence the claim: S06.358A leads as the principal diagnosis for the intracranial injury. Additional trauma codes cover the splenic injury, followed by the external cause code.

Sequenced that way, the claim tells the payer the whole story in the right order. The intracranial injury explains the admission, the splenic injury explains the death, and the V-code explains both.

How Pabau supports accurate ICD-10-CM coding workflows

Complex TBI codes like S06.358A fail at claim review when one required element never reaches the note. Retrospective chart queries then add days to an already slow reimbursement cycle. Pabau, an all-in-one practice management system, moves that work to the point of care.

Clinicians using Pabau Scribe, our AI scribe, can structure the note while the encounter is still open. Laterality, LOC status, injury mechanism, and cause of death all land in the record before the chart closes.

Pabau’s integrated claims management software connects the clinical note to the billing workflow. Coders cross-reference the record in one place instead of switching between systems to answer a single laterality question.

Teams handling high trauma volume can build note templates in Pabau that prompt for every element a code requires. That trims the physician query burden and shortens the documentation-to-billing cycle, which is where AI scribes repay the setup time.

Reduce TBI coding errors with structured documentation

Pabau's clinical records and coding workflows capture the exact documentation complex codes like S06.358A need. Your team can close the chart and the claim without a second pass.

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Conclusion

ICD-10 code S06.358A is one of the most specific codes in the S06 category, and that specificity is deliberate. Three clinical conditions have to hold at once before you can assign it. Verify each one against the record rather than the discharge summary.

Trauma coding rarely fails on code selection. It fails when the note skipped laterality, mechanism, LOC, or cause of death while the patient was still in the room. Fix the documentation workflow first and the coding follows.

Pabau’s HIPAA-compliant clinical record tools keep those four elements in one place. Book a demo to see how Pabau supports TBI coding accuracy and cleaner trauma claims.

Continue your research

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