🧬 ICD-10 CM S06.0X0D — Concussion Without Loss of Consciousness, Subsequent Encounter
Billable Code Confirmed
ICD-10 CM S06.0X0D is a complete, seven-character ICD-10-CM code specifying concussion type, loss-of-consciousness status (absent), and encounter type (subsequent), which is why it is fully billable and POA-exempt in FY2026.
Non-Billable Parent Codes
S06 (Intracranial injury) is a non-billable category header because it does not specify the type or severity of intracranial injury. S06.0 (Concussion) is likewise non-billable on its own since it omits the required loss-of-consciousness character and the 7th-character encounter extension. Both require additional characters before they can be reported on a claim.
Clinical Context
Code Classification
ICD-10 CM S06.0X0D is a diagnosis code describing a traumatic injury encounter and is not a procedure code.
🔍 Code Description
Concussion without loss of consciousness, subsequent encounter, describes a patient who sustained a mild traumatic brain injury with no documented period of unconsciousness and who is now being seen for continued routine healing, symptom monitoring, or follow-up care rather than emergent treatment. This code sits within the S06 intracranial injury category, under the S06.0- concussion subcategory, part of the head injury block within Chapter 19 of ICD-10-CM covering injuries and external causes. The 7th character “D” for subsequent encounter distinguishes this from the initial encounter code S06.0X0A, signaling that the acute phase of care has passed and the patient is now in the recovery or aftercare stage.
Correct code selection depends on confirming that no loss of consciousness was ever documented anywhere in the injury record, since even a brief, unspecified LOC would shift the code family to S06.0X9D or a more specific duration code. AAPC coding discussions frequently address the distinction between assigning this subsequent-encounter code versus a personal history code (Z87.820) once the concussion has clinically resolved and the patient is being seen only for an unrelated complaint, such as headache that has since cleared.^4 When lingering symptoms are formally diagnosed as a distinct chronic condition, coders should instead consider the sequela 7th character “S” with an appropriate additional code such as F07.81 for postconcussional syndrome.
🌳 Code Tree / Hierarchy
S06 Intracranial injury ❌ Non-billable
│
├── S06.1X Traumatic cerebral edema ❌ Non-billable
├── S06.2X Diffuse traumatic brain injury ❌ Non-billable
│
├── S06.0X Concussion ❌ Non-billable
│ │
│ ├── S06.0X0D Concussion without loss of consciousness, subsequent encounter ◀ THIS CODE ✅ Billable
│ ├── S06.0X1D Concussion with LOC of 30 minutes or less, subsequent encounter ✅ Billable
│ ├── S06.0X2D Concussion with LOC of 31-59 minutes, subsequent encounter ✅ Billable
│ ├── S06.0X3D Concussion with LOC of 1 hour to 5 hrs 59 min, subsequent encounter ✅ Billable
│ ├── S06.0X4D Concussion with LOC of 6-24 hours, subsequent encounter ✅ Billable
│ └── S06.0X9D Concussion with LOC of unspecified duration, subsequent encounter ✅ Billable
Resolved vs. Active Condition
AAPC coding guidance notes that once a concussion has fully resolved and only history remains at a follow-up visit, Z87.820 (personal history of traumatic brain injury) is more appropriate than continuing to bill S06.0X0D, so confirming the current clinical status at each visit matters.
Tip
Always verify the 7th character matches the true phase of care: use “A” for active/initial treatment, “D” for routine healing and follow-up while symptoms are still being actively managed, and “S” only when coding a residual late effect.
✅ Includes
- Concussion confirmed without any period of unconsciousness, currently in the healing/follow-up phase of care
- Return visits for continued monitoring of concussion symptoms (such as headache or dizziness) where no LOC was ever documented
- Subsequent encounters for concussion management following an initial emergency department or urgent care visit, distinct from S06.0X9D when LOC status is unspecified rather than confirmed absent
❌ Excludes
Excludes 1
- S06.1- through S06.6-, S06.81- through S06.89- (Concussion with other intracranial injuries) are excluded because when a concussion is documented alongside a more severe classified intracranial injury such as cerebral edema or hemorrhage, only the more specific intracranial injury code is reported, not a separate concussion code.
- S09.90- (Head injury, unspecified) is excluded because a documented concussion diagnosis is inherently more specific than an unspecified head injury and should always be coded preferentially when confirmed.
Danger
The most common Excludes1 error is coding S06.0X0D alongside a separately classified intracranial injury code (like traumatic subdural hemorrhage) for the same injury event, when only the more severe, specific injury code should be reported.
Excludes 2
No Excludes2 notes are published for S06.0X0D in the FY2026 ICD-10-CM tabular list, meaning there are no conditions specifically permitted to be coded simultaneously with this code under an Excludes2 instruction.
📋 Clinical Overview
Subsequent Encounter vs. Resolved History
Distinguishing an active subsequent encounter from a fully resolved history is critical for concussion coding because it determines whether S06.0X0D or a personal history code applies. A subsequent encounter reflects ongoing, expected healing with symptoms still being managed, while a resolved history reflects a patient with no current symptoms being seen for an unrelated reason.
| Feature | S06.0X0D | S06.0X0A (Initial encounter) | Z87.820 (Personal history of TBI) |
|---|---|---|---|
| Phase of care | Routine healing/follow-up with symptoms still being monitored. | Active treatment during the emergency or acute care visit. | Condition fully resolved; coded as history only, no active symptoms. |
| 7th character | D | A | N/A (Z-code, no 7th character) |
| Typical setting | Outpatient follow-up, primary care, or neurology clinic. | Emergency department or urgent care at time of injury. | Any setting where TBI history is relevant to current unrelated care. |
Important
A CDI trigger should fire whenever a follow-up note says “history of concussion” without clarifying whether symptoms are still present (supporting S06.0X0D) or fully resolved (supporting Z87.820), since this changes the entire code selection.
Manifestations & Symptom Burden
- Headache following the initial concussive event, monitored at follow-up visits.
- Dizziness or mild balance disturbance during the recovery phase.
- Difficulty concentrating or mild memory disturbance reported at subsequent encounters.
- Fatigue or sleep disturbance during the post-concussive recovery period.
- Mild irritability or mood changes noted during ongoing symptom monitoring.
Tip
If any of these manifestations persist well beyond the expected healing window and are documented as a distinct chronic condition, consider whether postconcussional syndrome (F07.81) should be coded in addition to or instead of the subsequent-encounter concussion code.
💰 HCC Risk Adjustment
ICD-10 CM S06.0X0D is not mapped to any CMS-HCC v28 category, so it does not carry a RAF weight or influence Medicare Advantage risk scores. Coders should still document and code it accurately for clinical completeness and quality measure purposes, but no additional risk-adjustment capture strategy applies to this code. If a patient develops a chronic neurocognitive sequela, that separate diagnosis should be evaluated independently for HCC mapping.
🏥 MS-DRG Assignment
As a subsequent-encounter code, S06.0X0D typically groups to DRG 949 (Aftercare with CC/MCC) or DRG 950 (Aftercare without CC/MCC) rather than an acute traumatic brain injury DRG, reflecting its role as a follow-up/recovery diagnosis rather than an acute admitting condition.^3 This code is exempt from POA reporting since subsequent encounters by definition do not represent conditions present on a new admission. Coders should confirm the principal diagnosis for the current encounter is accurately sequenced, since S06.0X0D will rarely if ever serve as principal diagnosis for an acute inpatient stay.
🔗 Related ICD-10-CM Codes
Same S06.0X concussion family: S06.0X1D, S06.0X2D, S06.0X3D, S06.0X4D, S06.0X9D
Related traumatic brain injury and encounter codes: S06.0X0A, S06.0X0S, F07.81, Z87.820
🛠️ Commonly Associated CPT Codes
- 99214/99215 (Established patient office/outpatient visit, moderate to high complexity) - commonly billed for subsequent-encounter concussion follow-up visits assessing symptom resolution.
- 96116 (Neurobehavioral status exam) - used when cognitive function is formally assessed during concussion recovery monitoring.
- 97110 (Therapeutic exercise) - billed when vestibular or balance rehabilitation therapy is part of the concussion recovery plan.
- 95816 (EEG) - ordered occasionally to rule out post-traumatic seizure activity during subsequent concussion follow-up.
- 99242-99245 (Office consultation, new patient, if applicable pre-2023 payer policy) - reported when a specialist (such as neurology) is consulted for persistent post-concussive symptoms.
NCCI Bundling Considerations
Evaluation and management codes billed alongside neurobehavioral status exams (96116) may require modifier -25 to indicate a significant, separately identifiable service was performed on the same date, since payers commonly bundle E/M visits with cognitive testing absent clear documentation of medical necessity for both.
🔬 ICD-10-PCS Crosswalk
ICD-10 CM S06.0X0D is a diagnosis code and does not directly crosswalk to a procedure code, but related follow-up encounters may involve CPT-based cognitive rehabilitation and imaging procedures, such as head CT or MRI, when ordered to evaluate persistent post-concussive symptoms during the subsequent encounter phase.
💊 Coding Scenarios and Examples
Scenario 1: A 16-year-old high school athlete was seen in urgent care two weeks ago for a concussion sustained during a football game, with the initial note clearly documenting “no loss of consciousness at any point.” He now returns to his pediatrician for a routine follow-up, still reporting mild headaches and difficulty concentrating in school. Correct coding: S06.0X0D as the reason for the visit, since this represents ongoing routine healing care for a concussion without loss of consciousness.
Scenario 2: A 35-year-old female was treated in the ED three weeks ago for a concussion without LOC after a fall at home. She now presents to her PCP for an unrelated annual physical, reports feeling completely back to normal with no residual symptoms, and the concussion is mentioned only as past medical history. Correct coding: Z87.820 (Personal history of traumatic brain injury) is used instead of S06.0X0D, since the condition has fully resolved and no active management is occurring at this visit.
Scenario 3: A patient initially treated for a concussion without LOC now presents four months later with persistent cognitive fog, headaches, and irritability that the physician diagnoses as postconcussional syndrome requiring ongoing specialized treatment. Correct coding: F07.81 (Postconcussional syndrome) is coded as the primary diagnosis for this visit rather than S06.0X0D, since the condition has progressed to a distinct sequela requiring its own diagnostic code.
⚠️ Coding Pitfalls and Tips
- Confirm that no loss of consciousness was documented anywhere in the injury record before assigning S06.0X0D; even a brief unspecified LOC should shift the code to S06.0X9D or a more specific duration code.
- Do not continue billing S06.0X0D once the concussion has fully resolved and the patient has no active symptoms; switch to Z87.820 (personal history of TBI) for unrelated visits.
- Do not confuse “subsequent encounter” (7th character D) with “sequela” (7th character S); a persistent, chronic residual symptom should generally be coded as a sequela with an appropriate late-effect code, not repeatedly as a subsequent encounter.
- Remember that S06.0X0D is exempt from POA reporting, so do not attempt to assign a POA indicator to this code on inpatient claims.
- When a concussion is documented alongside a more severe intracranial injury, do not additionally code S06.0X0D; the more specific injury code takes precedence per Excludes1 guidance.
- If lingering cognitive symptoms are formally diagnosed as b, add F07.81 in addition to or instead of the subsequent-encounter concussion code, depending on the visit’s primary focus.
Sources:
1. ICD List. "ICD-10-CM Diagnosis Code S06.0X0D." https://icdlist.com/icd-10/S06.0X0D
2. Carepatron. "Concussion ICD-10-CM Codes." https://www.carepatron.com/icd/concussion/
3. Unbound Medicine. "S06.0X0D - Concussion without loss of consciousness [subsequent encounter]." https://www.unboundmedicine.com/icd/view/ICD-10-CM/931424/1/S06_0X0D
4. AAPC Discuss Forum. "Wiki - Concussion." https://www.aapc.com/discuss/threads/concussion.186744/