🧬 ICD-10 CM S06.300D — Unspecified Focal Traumatic Brain Injury Without Loss Of Consciousness, Subsequent Encounter
Billable Code Confirmed
ICD-10 CM S06.300D is a complete, 7-character code — S06.3 (focal TBI) + 0 (unspecified focal type) + 0 (without LOC) + D (subsequent encounter) — valid for claim submission with no further specificity required.¹
Non-Billable Parent Codes
S06.300 (Unspecified focal traumatic brain injury without loss of consciousness) is a header missing the 7th-character encounter type. S06.30 (Unspecified focal traumatic brain injury) and S06.3 (Focal traumatic brain injury) are broader header categories that cannot be billed directly.²
Clinical Context
This code applies when imaging or clinical exam confirms a focal (localized, as opposed to diffuse) traumatic brain injury but the documentation does not specify the exact type (contusion, laceration, or hemorrhage) or a laterality, and no loss of consciousness occurred.
Code Classification
This is a diagnosis code (ICD-10-CM), not a procedure code — pair it with the appropriate CPT/HCPCS codes for any imaging, monitoring, or intervention performed.
🔍 Code Description
Focal traumatic brain injury refers to localized brain damage from a direct impact, as opposed to diffuse axonal injury spread across the brain. S06.300D is used when the record documents a focal TBI without loss of consciousness but does not specify whether the injury is a contusion, laceration, or intracerebral hemorrhage, and does not identify a laterality (right, left, or bilateral) — a common scenario on an outside-facility transfer summary or an incomplete radiology impression that says only “focal contusion” without further characterization.
The 7th character “D” marks this as a subsequent encounter — the patient is receiving routine care during the healing/recovery phase rather than active initial management. This distinguishes it from S06.300A (initial encounter, used during the acute hospitalization) and S06.300S (sequela, used once treatment shifts to a residual late effect such as post-traumatic cognitive impairment rather than the injury itself).
🌳 Code Tree / Hierarchy
S06.3 [Focal traumatic brain injury] ❌ Non-billable
│
├── S06.30 [Unspecified focal traumatic brain injury] ❌ Non-billable
│ │
│ ├── S06.300 [Without loss of consciousness] ❌ Non-billable
│ │ ├── S06.300A [initial encounter] ✅ Billable
│ │ ├── S06.300D [subsequent encounter] ◀ THIS CODE ✅ Billable
│ │ └── S06.300S [sequela] ✅ Billable
│ │
│ └── S06.301 [LOC 30 min or less] ❌ Non-billable
│
├── S06.31 [Contusion and laceration of right cerebrum] ❌ Non-billable
├── S06.34 [Traumatic hemorrhage of right cerebrum] ❌ Non-billable
│
└── S06.37 [Contusion, laceration, and hemorrhage of cerebellum] ❌ Non-billableSpecificity Insight
Tip
Query the provider whenever “focal TBI, unspecified” appears on a subsequent visit if the original CT/MRI report in the chart actually identified a specific lobe or side — don’t let unspecified documentation persist forward once more detail exists in the record.
✅ Includes
Traumatic brain injury — S06.300D falls under the general “traumatic brain injury” inclusion note applying across the entire S06 category.³
❌ Excludes
Excludes 1
No Excludes1 notes are listed for this specific code.²
Excludes 2
S06.2- (Diffuse traumatic brain injury) is excludable in the sense that focal and diffuse TBI are clinically distinct patterns; if traumatic brain compression or herniation is also present, an additional code from S06.A- should be reported per the Use Additional Code instruction at the S06 category level, since compression/herniation is not inherently captured by the focal-injury code alone.
Danger
The most common Excludes-adjacent error is omitting the “Use Additional Code” for brain compression/herniation (S06.A0XD-family, if billable and applicable) when it is separately documented — this understates injury severity for both DRG and audit-defense purposes.
📋 Clinical Overview
Unspecified vs. Specified Focal Injury Type
The unspecified focal TBI code family exists as a fallback when the documentation confirms a focal injury but does not name the pathology (contusion vs. laceration vs. hemorrhage) or laterality. Coders should always scan for more specific documentation before defaulting here.
| Feature | S06.300D | Related S06.311D | Related S06.361D |
|---|---|---|---|
| Injury type | Unspecified focal TBI | Contusion/laceration, right cerebrum | Traumatic hemorrhage, unspecified cerebrum |
| Laterality | Not specified | Right | Unspecified |
| LOC status | Without LOC | With LOC (per 6th char) | With LOC (per 6th char) |
Important
A subsequent-encounter unspecified-focal-TBI code appearing as principal diagnosis on an acute inpatient claim is a CDI trigger — confirm the admission truly reflects ongoing management of the healing injury and not a new acute event.
Manifestations & Symptom Burden
During the subsequent-encounter phase, documentation commonly reflects headache, difficulty concentrating, or mild balance disturbance rather than acute neurologic decline, since loss of consciousness never occurred with this injury pattern.
Tip
“Without loss of consciousness” does not mean mild or asymptomatic — post-concussive symptoms can still be significant and should be documented to support ongoing management codes.
💰 HCC Risk Adjustment
Under CMS-HCC V28 (fully phased in for PY2026), the head-injury payment categories (HCC 397, 398, 399) are populated by initial-encounter codes; the sibling subsequent-encounter code S06.321D has been explicitly confirmed as non-mapping across V28, V24, ESRD, and RxHCC models,⁴ and S06.300D follows the identical 7th-character pattern. Flag for independent verification against the current CMS-HCC V28 crosswalk file before relying on this for RAF calculations.
🏥 MS-DRG Assignment
| DRG | Title | CC/MCC Status |
|---|---|---|
| 083 | Traumatic Stupor & Coma, Coma <1 Hr | w MCC |
| 084 | Traumatic Stupor & Coma, Coma <1 Hr | w CC |
| 085 | Traumatic Stupor & Coma, Coma <1 Hr | w/o CC/MCC |
These DRGs are typically driven by an initial-encounter code as principal diagnosis; S06.300D as a subsequent-encounter code will rarely group here and more often supports a secondary-diagnosis CC/MCC designation on an unrelated admission. There is no diagnosis-specific NCD for S06.300D itself. Coverage considerations attach to the procedures performed during follow-up — repeat neuroimaging (CT/MRI) and neurobehavioral/neuropsychological status exams — which are subject to your MAC’s (Noridian JE/JF) local coverage determinations on medical necessity for repeat imaging and cognitive testing frequency.⁵ Flag for live verification against the Medicare Coverage Database for the specific LCD applicable to the procedure billed alongside this diagnosis.
🔗 Related ICD-10-CM Codes
Same subcategory family (S06.30 — Unspecified focal TBI): S06.300A (initial encounter), S06.300S (sequela), S06.301D (with LOC 30 min or less, subsequent), S06.306D (with LOC >24 hrs, subsequent)
Other focal TBI, subsequent encounter: S06.311D (Contusion/laceration, right cerebrum, without LOC), S06.321D (Contusion/laceration, left cerebrum, without LOC), S06.361D (Traumatic hemorrhage, unspecified cerebrum, without LOC)
🛠️ Commonly Associated CPT Codes
- 70450 — CT head/brain without contrast. Standard follow-up imaging to confirm resolution of the focal injury during the healing phase.⁶
- 70551 — MRI brain without contrast, often preferred over CT for follow-up characterization of focal contusion/injury burden.
- 96116 — Neurobehavioral status exam, first hour, used to document cognitive/behavioral sequelae during subsequent-encounter follow-up.
- 96132 — Neuropsychological testing evaluation, first hour, used when more formal cognitive testing is medically necessary during recovery.
- 99231, 99232, 99233 — Subsequent hospital inpatient/observation care, reflecting daily management if the subsequent encounter occurs during an inpatient stay (e.g., rehab unit).
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -25 | Significant, Separately Identifiable E/M | Apply when a significant, separately identifiable E/M service is performed the same day as a minor procedure related to monitoring the healing injury. |
| -59 | Distinct Procedural Service | Apply when imaging or testing performed during the subsequent-encounter visit is distinct from another same-day bundled service. |
NCCI Bundling Considerations
CT head/brain codes (70450, 70460, 70470) bundle under NCCI edits when multiple contrast phases of the same study are billed on the same date; report only the single most comprehensive code rather than stacking individual component codes.
🔬 ICD-10-PCS Crosswalk
No procedure is inherent to a subsequent-encounter, without-LOC focal TBI diagnosis by itself. If neuroimaging or a monitoring procedure is performed as an inpatient service, code the specific PCS root operation performed (e.g., imaging root type B030 for MRI brain) rather than inferring one from the diagnosis. Flag for independent verification — PCS assignment depends entirely on the specific procedure documented, not the diagnosis code.
💊 Coding Scenarios and Examples
Example 1
Clinical Scenario: A patient with a focal brain contusion (unspecified location, no LOC documented) sustained two weeks prior is admitted to inpatient rehab for continued cognitive therapy.
| Field | Code | Rationale |
|---|---|---|
| PDx | S06.300D | Subsequent encounter for ongoing management of the healing focal TBI without LOC. |
| CPT | 96116 | Neurobehavioral status exam to document cognitive recovery progress. |
Tip
Confirm whether the original imaging report specified a laterality that should upgrade this to a more specific code before finalizing.
Example 2
Clinical Scenario: A follow-up outpatient-to-inpatient conversion visit for persistent mild cognitive complaints three weeks post-focal TBI; MRI brain is repeated and shows resolving contusion changes.
| Field | Code | Rationale |
|---|---|---|
| PDx | S06.300D | Subsequent encounter for routine follow-up during the healing phase. |
| CPT | 70551 | Follow-up MRI brain without contrast to assess resolution. |
Tip
If the MRI now identifies a specific laterality or injury type, recode to the more specific sibling code rather than continuing to use the unspecified code.
Example 3
Clinical Scenario: A patient readmitted for evaluation of new-onset headaches during the healing phase of a previously diagnosed unspecified focal TBI without LOC; formal neuropsychological testing is ordered.
| Field | Code | Rationale |
|---|---|---|
| PDx | S06.300D | Subsequent encounter for ongoing management/monitoring of the healing injury. |
| CPT | 96132 | Neuropsychological test evaluation performed to assess cognitive status during recovery. |
Tip
Sequela coding (S06.300S) would apply only once care shifts to treating a documented late effect rather than the injury itself.
⚠️ Coding Pitfalls and Tips
- Pitfall 1: Reporting the non-billable header S06.300 without the 7th character; Tips: always confirm the full 7-character string (including the placeholder-free duration/type digits) is present.
- Pitfall 2: Defaulting to the unspecified focal-TBI code when the chart actually documents laterality or a specific injury type (contusion/laceration/hemorrhage); Tips: review the imaging report and neurosurgical note before finalizing, and query if more specificity is available but not yet reflected in the code selection.
- Pitfall 3: Omitting the Use Additional Code for brain compression/herniation (S06.A-) when documented separately; Tips: check for herniation language in the neuro exam or imaging impression on every focal TBI encounter.
- Pitfall 4: Using a subsequent-encounter code as principal diagnosis on an acute inpatient stay without confirming medical necessity for that specific admission; Tips: query for a new acute finding if presentation severity suggests a fresh injury rather than routine follow-up.
- Pitfall 5: Assuming this code maps to an HCC category; Tips: verify the current-year V28 crosswalk directly, since subsequent-encounter TBI codes are generally excluded from the major head-injury payment HCCs.
📚 Sources
1. Centers for Medicare & Medicaid Services and National Center for Health Statistics. *ICD-10-CM FY2026 Full Code List.* CMS; 2026. https://icd-10codes.com/code/S06.300D 2. AutoICD API. *S06.30 — Unspecified focal traumatic brain injury, coding notes.* 2026. https://autoicdapi.com/icd10/S06.30 3. ICD-10-CM Official Guidelines for Coding and Reporting, FY2026. CMS/NCHS; 2026. https://icd-10codes.com/code/S06 4. HCC Buddy. *S06.321D — HCC Mapping Status, CMS-HCC V28/V24/ESRD/RxHCC.* 2026. https://hccbuddy.com/icd10/S06.321D 5. Noridian Healthcare Solutions. *Medicare Coverage Database — Local Coverage Determinations, JE/JF.* CMS; 2026. 6. CMS Physician Fee Schedule. *PPRRVU2026_Jan_QPP File.* CMS; January 2026.Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.