2027 ICD-10-CM Diagnosis Code S06.8A9SPrimary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela

ICD-10-CM Codes›S00–T88›S00-S09›S06

ICD-10-CM S06.8A9S
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S06.8A9S is a billable ICD-10-CM diagnosis code for primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

S06.8A9S no longer risk-adjusts for Medicare Advantage: it mapped to HCC 167 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 167, ESRD (V21) category 167, and ESRD (V24) category 167 for payment year 2027.

Code Identity

ICD-10-CM Code
S06.8A9S
Billable Status
Yes — Valid for Submission
Code Describes
Primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela
Short Description
Primary blast inj brain, NEC LOC of unsp duration, sequela
Parent Code
S06.8A9
Primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS06Intracranial injury
This CodeS06.8A9SPrimary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela

Present on Admission (POA)Billing

S06.8A9S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the head (S00-S09).

Medicare Risk Adjustment (HCC)Billing

S06.8A9S no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 167
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 167 · ESRD (V21): HCC 167 · ESRD (V24): HCC 167
ESRD V21 weights: 0.017 dialysis, 0.000–0.184 functioning graft · ESRD V24 weights: 0.043 dialysis, 0.000–0.239 functioning graft
Part D (RxHCC)
Not mapped
S06.8A9S does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

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 S06.8A9S: its own notes plus those printed at S06.8A, 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.

From S06 Intracranial injury applies to 569 codes
  • traumatic brain injury
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • 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.

From S06 Intracranial injury applies to 569 codes

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.

From S06.8A Primary blast injury of brain, not elsewhere classified applies to 29 codes
  • traumatic cerebral edema (S06.1)
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From S06 Intracranial injury applies to 569 codes
  • code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From S06.8A Primary blast injury of brain, not elsewhere classified applies to 29 codes
  • if applicable, focal traumatic brain injury (S06.3-)
From S06 Intracranial injury applies to 569 codes
  • any associated:
  • open wound of head (S01.-)
  • skull fracture (S02.-)
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • for any associated infection

Notes

General instructions on how these codes are used.

From S06 Intracranial injury applies to 569 codes
  • 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.
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From S06 Intracranial injury applies to 569 codes
  • The appropriate 7th character is to be added to each code from category S06, except as noted below
Values for category S06 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela this code

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S06.8A9S, its category, or a range that includes it.

Excludes1 9

These codes carry an Excludes1 note naming S06.8A9S: they are not reported together with it, unless the two conditions are unrelated.

  • G31.84 Mild cognitive impairment of uncertain or unknown etiology
    cognitive impairment due to intracranial or head injury (S06.-) names S06.-, which includes this code
  • Block I60-I69 Cerebrovascular diseases
    traumatic intracranial hemorrhage (S06.-) names S06.-, which includes this code
  • I69 Sequelae of cerebrovascular disease
    sequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
  • I69.8 Sequelae of other cerebrovascular diseases
    sequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
  • I69.9 Sequelae of unspecified cerebrovascular diseases
    sequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
  • P52 Intracranial nontraumatic hemorrhage of newborn
    intracranial hemorrhage due to other injury (S06.-) names S06.-, which includes this code
  • S06.9 Unspecified intracranial injury
    conditions classifiable to S06.0- to S06.8-code to specified intracranial injury names S06.8, which includes this code
  • S09.0 Injury of blood vessels of head, not elsewhere classified
    injury of cerebral blood vessels (S06.-) names S06.-, which includes this code
  • S15.0 Injury of carotid artery of neck
    injury of internal carotid artery, intracranial portion (S06.8) names S06.8, which includes this code

Code First 5

These codes say to code first a condition named in the note, and S06.8A9S is one of the conditions named.

  • F02 Dementia in other diseases classified elsewhere
    traumatic brain injury (S06.-) names S06.-, which includes this code
  • F06.7 Mild neurocognitive disorder due to known physiological condition
    traumatic brain injury (S06.-) names S06.-, which includes this code
  • F48.2 Pseudobulbar affect
    sequelae of traumatic intracranial injury (S06.-) names S06.-, which includes this code
  • R40.2 Coma
    intracranial injury (S06.-) names S06.-, which includes this code
  • S04 Injury of cranial nerve
    any 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 S06.8A9S is one of the codes named.

  • S07 Crushing injury of head
    intracranial injuries (S06.-) names S06.-, which includes this code

Code Also 2

These codes say S06.8A9S may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S01 Open wound of head
    intracranial injury (S06.-) names S06.-, which includes this code
  • S02 Fracture of skull and facial bones
    any associated intracranial injury (S06.-) names S06.-, which includes this code

Notes 1

These notes mention S06.8A9S.

  • S06 Intracranial injury
    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. names S06, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement S06.8A9S replaces the following previously assigned code(s):

  • S06.0X9S - Concussion w loss of consciousness of unsp duration, sequela
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S06.8A9SOverview

Is S06.8A9S a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character S in S06.8A9S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration itself has resolved, not the original event.

What MS-DRG does S06.8A9S group to?

When primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S06.8A9S exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for primary blast injury of brain, not elsewhere classified with loss of consciousness of unspecified duration, sequela on inpatient claims. The code appears in the Injuries to the head (S00-S09) range of the CMS exempt list.

Can S06.8A9S be reported with S09.90?

Not as a rule. The Excludes1 note at S06, which applies to S06.8A9S, lists "head injury NOS (S09.90)". 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).

Does S06.8A9S risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. S06.8A9S mapped to HCC 167 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 167 (Major Head Injury), ESRD (V21) category 167 (Major Head Injury), and ESRD (V24) category 167 (Major Head Injury).