2027 ICD-10-CM Diagnosis Code S06.0XAAConcussion with loss of consciousness status unknown, initial encounter
ICD-10-CM Codes›S00–T88›S00-S09›S06
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character A — Initial Encounter
- Not Chronic
S06.0XAA is a billable ICD-10-CM diagnosis code for concussion with loss of consciousness status unknown, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 88 through 90, 963 through 965. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 373 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Traumatic brain injury (TBI); concussion, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Brain injury with open intracranial wound AND concussion
- Cerebral cortex laceration with concussion
- Closed fracture of base of skull
- Closed fracture of base of skull with concussion
- Closed fracture of base of skull with intracranial injury
- Closed fracture of vault of skull
- Closed fracture of vault of skull with concussion
- Closed fracture vault of skull with intracranial injury
- Closed skull fracture with intracranial injury
- Cortex laceration
- Cortex laceration with open intracranial wound
- Cortex laceration with open intracranial wound AND concussion
- Open fracture of vault of skull
- Open fracture of vault of skull with concussion
- Open fracture vault of skull with intracranial injury
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Intracranial injury (S06). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to S06.0XAA: its own notes plus those printed at S06.0, S06, block S00-S09, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- traumatic brain injury
- injuries of ear
- injuries of eye
- injuries of face [any part]
- injuries of gum
- injuries of jaw
- injuries of oral cavity
- injuries of palate
- injuries of periocular area
- injuries of scalp
- injuries of temporomandibular joint area
- injuries of tongue
- injuries of tooth
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- burns and corrosions (T20-T32)
- effects of foreign body in ear (T16)
- effects of foreign body in larynx (T17.3)
- effects of foreign body in mouth NOS (T18.0)
- effects of foreign body in nose (T17.0-T17.1)
- effects of foreign body in pharynx (T17.2)
- effects of foreign body on external eye (T15.-)
- frostbite (T33-T34)
- insect bite or sting, venomous (T63.4)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)
- code to identify any retained foreign body, if applicable (Z18.-)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- for any associated infection
Notes
General instructions on how these codes are used.
- 7th characters D and S do not apply to codes in category S06 with 6th character 7 - death due to brain injury prior to regaining consciousness, or 8 - death due to other cause prior to regaining consciousness.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- The appropriate 7th character is to be added to each code from category S06, except as noted below
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name S06.0XAA, its category, or a range that includes it.
Excludes1 10
These codes carry an Excludes1 note naming S06.0XAA: they are not reported together with it, unless the two conditions are unrelated.
- F07.81 Postconcussional syndromecurrent concussion (brain) (S06.0X- with seventh character A) names S06.0X-, which includes this code
- G31.84 Mild cognitive impairment of uncertain or unknown etiologycognitive impairment due to intracranial or head injury (S06.-) names S06.-, which includes this code
- Block I60-I69 Cerebrovascular diseasestraumatic intracranial hemorrhage (S06.-) names S06.-, which includes this code
- I69 Sequelae of cerebrovascular diseasesequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
- I69.8 Sequelae of other cerebrovascular diseasessequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
- I69.9 Sequelae of unspecified cerebrovascular diseasessequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
- P52 Intracranial nontraumatic hemorrhage of newbornintracranial hemorrhage due to other injury (S06.-) names S06.-, which includes this code
- S06.89 Other specified intracranial injuryconcussion (S06.0X-) names S06.0X-, which includes this code
- S06.9 Unspecified intracranial injuryconditions classifiable to S06.0- to S06.8-code to specified intracranial injury names S06.0-, which includes this code
- S09.0 Injury of blood vessels of head, not elsewhere classifiedinjury of cerebral blood vessels (S06.-) names S06.-, which includes this code
Code First 5
These codes say to code first a condition named in the note, and S06.0XAA is one of the conditions named.
- F02 Dementia in other diseases classified elsewheretraumatic brain injury (S06.-) names S06.-, which includes this code
- F06.7 Mild neurocognitive disorder due to known physiological conditiontraumatic brain injury (S06.-) names S06.-, which includes this code
- F48.2 Pseudobulbar affectsequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
- R40.2 Comaintracranial injury (S06.-) names S06.-, which includes this code
- S04 Injury of cranial nerveany associated intracranial injury (S06.-) names S06.-, which includes this code
Use Additional Code 1
These codes say to use an additional code from the note, and S06.0XAA is one of the codes named.
Code Also 3
These codes say S06.0XAA may also be needed to fully describe the condition. The note gives no sequencing direction.
- F07.81 Postconcussional syndromeif applicable, sequela of concussion (S06.0X- with seventh character S) names S06.0X-, which includes this code
- S01 Open wound of headintracranial injury (S06.-) names S06.-, which includes this code
- S02 Fracture of skull and facial bonesany associated intracranial injury (S06.-) names S06.-, which includes this code
Notes 1
These notes mention S06.0XAA.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Concussion
a violent jar or shock, or the condition which results from such an injury.
Patient EducationClinical
Concussion
A concussion is a type of brain injury. It involves a short loss of normal brain function. It happens when a hit to the head or body causes your head and brain to move rapidly back and forth. This sudden movement can cause the brain to bounce around or twist in the skull, creating chemical changes in your brain.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement S06.0XAA replaces the following previously assigned code(s):
- S06.0X9A - Concussion w loss of consciousness of unsp duration, init
Questions About S06.0XAAOverview
Is S06.0XAA (Concussion with loss of consciousness status unknown) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report concussion with loss of consciousness status unknown, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in S06.0XAA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for concussion with loss of consciousness status unknown, such as an emergency visit or first evaluation.
What MS-DRG does S06.0XAA group to?
When concussion with loss of consciousness status unknown, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 88, 964, 965, 89, 90, 963, with relative weights from 0.8280 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S06.0XAA a CC or MCC?
CMS lists S06.0XAA as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 373 closely related codes in its exclusion list.
Can S06.0XAA be reported with a code from S06.1?
Not as a rule. The Excludes1 note at S06.0, which applies to S06.0XAA, lists "concussion with other intracranial injuries classified in subcategories S06.1- to S06.6-, and S06.81- to S06.89-, code to specified intracranial injury". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
