🧬 ICD-10 CM S06.0X0A — Concussion Without Loss of Consciousness, Initial Encounter
Billable Code Confirmed
ICD-10 CM S06.0X0A is a full 7-character code — the placeholder “X” fills the unused 5th character position required by ICD-10-CM injury-code conventions, and the “A” 7th character confirms active treatment during this encounter, making the code complete and billable.
Non-Billable Parent Codes
S06 — Category-level code for all intracranial injury; far too broad to bill. S06.0 — Identifies concussion generally but omits the required LOC-status and 7th-character detail. S06.0X0 — Specifies “without loss of consciousness” but is still missing the mandatory 7th character indicating encounter type.
Clinical Context
This code applies specifically when head trauma has caused transient neurologic symptoms — confusion, headache, dizziness — but no documented loss of consciousness at any point, distinguishing it from the LOC-duration codes in the same S06.0X- family.
Code Classification
This is an injury diagnosis code requiring a mandatory 7th character; “A” designates initial encounter — meaning active treatment — not necessarily the patient’s first visit for the condition.
🔍 Code Description
ICD-10 CM S06.0X0A documents a diagnosed concussion where the patient never lost consciousness, capturing the mildest end of the traumatic brain injury spectrum. The code sits within the S06 intracranial injury category, specifically under the concussion subcategory, and its defining feature — LOC status — must be pulled directly and carefully from documentation across the chart, not inferred. This matters because ICD-10-CM offers a full LOC-duration ladder within S06.0X- (no LOC, LOC ≤30 min, LOC 31-59 min, LOC 1-5.9 hrs, LOC 6-24 hrs, LOC >24 hrs with/without return to consciousness, LOC of unspecified duration, and LOC status unknown), so picking the wrong sibling code is a common and easily audited error.
Coding here also requires attention to the mandatory 7th character, which reflects encounter phase (initial “A,” subsequent “D,” or sequela “S”) rather than visit number — a patient seen for the third time during ongoing active treatment for the same concussion still uses “A.” An additional code from F06.7 may be reported if the provider identifies mild neurocognitive disorder due to the known physiological condition, and external cause codes from Chapter 20 should accompany this code to document how, where, and during what activity the injury occurred.
🌳 Code Tree / Hierarchy
S06 Intracranial injury ❌ Non-billable
│
├── S06.0 Concussion ❌ Non-billable parent
│ │
│ ├── S06.0X0 Concussion without loss of consciousness ❌ Non-billable parent
│ │ │
│ │ ├── S06.0X0A Concussion without LOC, initial encounter ◀ THIS CODE ✅ Billable
│ │ ├── S06.0X0D Concussion without LOC, subsequent encounter ✅ Billable
│ │ └── S06.0X0S Concussion without LOC, sequela ✅ Billable
│ │
│ ├── S06.0X1 Concussion with LOC of 30 minutes or less ❌ Non-billable parent
│ │ │
│ │ └── [[S06.0X1A]] Concussion with LOC ≤30 min, initial encounter ✅ Billable
│ │
│ └── S06.0X9 Concussion with LOC of unspecified duration ❌ Non-billable parent
│ │
│ └── [[S06.0X9A]] Concussion with LOC of unspecified duration, initial encounter ✅ Billable
│
└── S06.1-S06.89 Other, more specific intracranial injuries ✅ Billable (mutually exclusive with concussion codes per Excludes1)
LOC Documentation Precision
If EMS documentation mentions “briefly unresponsive at scene” but the ED note says “no LOC per patient report,” that’s a documentation conflict worth a physician query — the LOC codes and the no-LOC code are not interchangeable and the discrepancy affects both DRG and clinical accuracy.
Tip
Always pair this code with an appropriate external cause code (fall, sports injury, assault, etc.) and place-of-occurrence code — while these don’t affect DRG weight, they’re expected under Chapter 19 coding conventions and support trauma registry reporting.
✅ Includes
- Mild traumatic brain injury with transient post-concussive symptoms (headache, dizziness, confusion, brief amnesia) and no documented loss of consciousness at any point
- Closed head injury following blunt trauma, sports injury, fall, or assault, where LOC is explicitly ruled out or not present per documentation
❌ Excludes
Excludes 1
S06.1-S06.6, S06.81-S06.89 — Concussion occurring alongside a more specific intracranial injury (cerebral contusion/laceration, hemorrhage, diffuse axonal injury, etc.). When any of these more specific findings are also diagnosed on imaging or exam, code to the specific injury instead of separately reporting the general concussion code.
Danger
The most common Excludes1 error here is coding both a concussion code and a specific intracranial hemorrhage code from the same S06 category on the same encounter — pick the more specific injury and drop the general concussion code entirely, since ICD-10-CM treats concussion as fully absorbed into the more specific diagnosis when both are documented.
Excludes 2
No Excludes2 notes are published specific to S06.0X0A.
📋 Clinical Overview
LOC-Duration Code Selection
Choosing correctly among the S06.0X- family hinges entirely on documented LOC duration, which is why this table anchors on that distinction rather than symptom severity.
| Feature | S06.0X0A (No LOC) | S06.0X1A (LOC ≤30 min) | S06.0X9A (LOC, Unspecified Duration) |
|---|---|---|---|
| LOC Documentation | Explicitly no LOC anywhere in the chart — patient alert throughout per all documentation sources. | Brief LOC clearly documented with a stated or estimated duration under 30 minutes. | LOC documented as having occurred, but no duration specified anywhere in the record. |
| Typical Clinical Path | Usually managed with observation, neuro checks, and symptom-based return precautions; often a short ED stay or brief admission. | Slightly higher-acuity workup; may prompt more extensive imaging depending on other findings. | Requires a coder query or default to unspecified-duration coding if duration truly can’t be determined from the record. |
| Coding/Audit Note | Coder must confirm absence of LOC is explicit, not just “unremarkable” or unaddressed in the note. | Coder must confirm the duration estimate is provider-documented, not coder-inferred from vague language like “briefly out.” | Should prompt a query for duration specificity before defaulting here, since it’s the least specific LOC option. |
Important
CDI trigger: “patient was dazed” or “seemed out of it” is not equivalent to documented LOC — flag ambiguous language for provider clarification rather than defaulting to an LOC code based on lay description.
Manifestations & Symptom Burden
- Headache — one of the most common presenting post-concussive symptoms, often the chief complaint driving the ED visit.
- Confusion/disorientation — transient cognitive fog immediately following the injury, typically resolving within hours to days.
- Dizziness — frequently reported alongside headache, sometimes overlapping with vestibular symptoms.
- Nausea/vomiting — common in the acute post-injury period and a factor in observation-level decision-making.
- Amnesia (retrograde or anterograde) — brief memory gaps around the time of injury, distinct from LOC and separately documented when present.
Tip
Post-concussive symptoms can persist for days to weeks after the acute injury — if the patient returns with ongoing symptoms from the same injury event, that’s a subsequent encounter (“D”), not a new initial encounter, even if seen by a different provider or facility.
💰 HCC Risk Adjustment
ICD-10 CM S06.0X0A is not mapped to any HCC category under CMS-HCC V28 or RxHCC and carries zero RAF weight, consistent with its status as an acute injury code rather than a chronic condition.
🏥 MS-DRG Assignment
As principal diagnosis, S06.0X0A groups to MDC 01 (Nervous System) and the concussion DRG triad: DRG 088 (with MCC), DRG 089 (with CC), or DRG 090 (without CC/MCC), with severity tier determined entirely by secondary diagnoses on the chart rather than by the concussion diagnosis itself. The biggest sequencing risk is LOC-code selection accuracy — miscoding the LOC status doesn’t just misrepresent the clinical picture, it changes which specific S06.0X- code groups into the claim, and while all sibling concussion codes map to the same DRG triad, coding accuracy still matters for quality reporting, trauma registries, and audit defensibility.
🔗 Related ICD-10-CM Codes
Same concussion family (LOC-duration variants):
- S06.0X1A - Concussion with LOC of 30 minutes or less, initial encounter
- S06.0X2A - Concussion with LOC of 31-59 minutes, initial encounter
- S06.0X9A - Concussion with LOC of unspecified duration, initial encounter
- S06.0XAA - Concussion with LOC status unknown, initial encounter
Related intracranial injury and sequela codes:
- S06.0X0D - Concussion without LOC, subsequent encounter
- S06.0X0S - Concussion without LOC, sequela
- F06.7 - Mild neurocognitive disorder due to known physiological condition (code additionally if applicable)
🛠️ Commonly Associated CPT Codes
- 70450 - CT head without contrast; standard first-line imaging to rule out more significant intracranial injury.
- 99284-99285 - ED evaluation and management codes reflecting the moderate-to-high complexity workup typical of a concussion presentation.
- 96116 - Neurobehavioral status exam, when cognitive assessment is performed as part of concussion evaluation.
- 97110 - Therapeutic exercise, relevant if vestibular or balance therapy is initiated for persistent post-concussive symptoms.
- 92700 - Unlisted otorhinolaryngological service, sometimes used for specialized vestibular/balance testing tied to post-concussive dizziness.
NCCI Bundling Considerations
CT head and any same-day plain radiography of the skull are typically distinct, separately reportable services when both are clinically indicated, but check standard NCCI PTP edits before billing overlapping imaging codes on the same date. E/M and observation codes billed alongside concussion diagnosis should follow standard facility E/M bundling rules rather than anything specific to this diagnosis code.
🔬 ICD-10-PCS Crosswalk
Not applicable in the typical case — concussion without LOC rarely requires an inpatient procedure. If neurosurgical intervention becomes necessary due to a co-occurring finding, code the procedure under the applicable PCS section for that specific intervention rather than under this diagnosis code.
💊 Coding Scenarios and Examples
Scenario 1 — Sports injury, no LOC, brief observation A high school athlete is evaluated after a helmet-to-helmet collision; sideline assessment and ED workup both document the patient was alert and oriented throughout, with no LOC, but complaining of headache and dizziness.
- Correct coding: S06.0X0A, plus an external cause code for the sports-related mechanism
- Sequencing: S06.0X0A as principal (or first-listed) diagnosis; external cause code follows per Chapter 20 conventions
- CDI note: Confirm sideline and ED documentation agree on LOC status before finalizing — conflicting accounts should trigger a query.
Scenario 2 — Fall with brief LOC misdocumented as “no LOC” A patient falls at home; EMS notes “unresponsive approximately 1 minute at scene,” but the ED intake note states “denies LOC.”
- Correct coding: Query required before finalizing — likely S06.0X1A (LOC ≤30 min) if EMS documentation is confirmed accurate, not S06.0X0A
- Sequencing: Pending query resolution
- CDI note: This is a textbook LOC-documentation-conflict query; coding directly off the ED note without reconciling EMS documentation risks under-coding severity.
Scenario 3 — Subsequent visit for persistent post-concussive symptoms A patient originally coded with S06.0X0A returns one week later still reporting headache and difficulty concentrating, still undergoing active management for the same injury.
- Correct coding: S06.0X0D (subsequent encounter), not a new S06.0X0A
- Sequencing: Single code, principal or first-listed diagnosis depending on visit type
- CDI note: “Initial encounter” reflects active-treatment phase, not visit count — this is a frequent misconception worth reinforcing with new coders.
⚠️ Coding Pitfalls and Tips
- Never assume “no mention of LOC” in a note equals S06.0X0A — absence of documentation is not the same as documented absence of LOC; query if unclear.
- Watch for conflicting LOC documentation across EMS, ED, and inpatient notes — reconcile via query before finalizing the specific S06.0X- code.
- Remember the 7th character reflects treatment phase, not visit number — repeat visits during active treatment still use “A.”
- Apply the Excludes1 rule strictly: if a more specific intracranial injury is diagnosed alongside the concussion, code only the specific injury.
- Always pair with an external cause code and, when documented, a Glasgow Coma Scale (GCS) — neither affects DRG weight but both are expected under injury coding conventions.
- Don’t forget F06.7 as an additional code if the provider documents a mild neurocognitive disorder tied to this injury — it’s a “code if applicable” note, easy to overlook.