ICD-10-CM 2027 diagnosis code
S06.899AOther specified intracranial injury with loss of consciousness of unspecified duration, initial encounter
S06.899A is a valid, billable ICD-10-CM code for other specified intracranial injury with loss of consciousness of unspecified duration, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Intcran inj w loss of consciousness of unsp duration, init
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About S06.899A
S06.899A is the ICD-10-CM diagnosis code for other specified intracranial injury with loss of consciousness of unspecified duration, initial encounter. It belongs to category S06 (intracranial injury), block S00-S09 (injuries to the head) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
Use an additional code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 082 (Traumatic Stupor and Coma >1 Hour with MCC, relative weight 2.2928), DRG 083 (Traumatic Stupor and Coma >1 Hour with CC, relative weight 1.3831), DRG 084 (Traumatic Stupor and Coma >1 Hour without CC/MCC, relative weight 0.9605), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and DRG 965 (Other Multiple Significant Trauma without CC/MCC, relative weight 1.0059), in MDC 01 (Diseases and Disorders of the Nervous System) and MDC 24 (Multiple Significant Trauma), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 854.06 (intracranial injury of other and unspecified nature without mention of open intracranial wound, with loss of consciousness of unspecified duration).
7th character
Ainitial encounter
CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.
Other encounter types for S06.899:
Notes that apply from higher levels
Instructions written at a parent level also apply to S06.899A.
› From S06.89 Other specified intracranial injury
- concussion (S06.0X-)
› From 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.
- traumatic brain injury
- head injury NOS (S09.90)
- code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)
Broader instructions also apply from S00-S09 Injuries to the head and Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 01 · Diseases and Disorders of the Nervous System
ICD-9-CM equivalent
Converter →- 854.06Intracranial injury of other and unspecified nature without mention of open intracranial wound, with loss of consciousness of unspecified durationapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about S06.899A
Is S06.899A billable?
- Yes. S06.899A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of S06.899A mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can S06.899A be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S06.899A as a principal diagnosis.
Is S06.899A a CC or MCC?
- S06.899A is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does S06.899A group to?
- S06.899A is used in the MS-DRG v44.0 logic for MS-DRG 082 (Traumatic Stupor and Coma >1 Hour with MCC), MS-DRG 083 (Traumatic Stupor and Coma >1 Hour with CC), MS-DRG 084 (Traumatic Stupor and Coma >1 Hour without CC/MCC), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and MS-DRG 965 (Other Multiple Significant Trauma without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for S06.899A?
- The CMS General Equivalence Mappings map S06.899A to ICD-9-CM 854.06.