ICD-10-CM 2027 diagnosis code
S06.37AAContusion, laceration, and hemorrhage of cerebellum with loss of consciousness status unknown, initial encounter
S06.37AA is a valid, billable ICD-10-CM code for contusion, laceration, and hemorrhage of cerebellum with loss of consciousness status unknown, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Contus/lac/hem crblm with LOC status unknown, init
Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About S06.37AA
S06.37AA is the ICD-10-CM diagnosis code for contusion, laceration, and hemorrhage of cerebellum with loss of consciousness status unknown, 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 an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" 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 020 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage with MCC, relative weight 7.9629), DRG 021 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage with CC, relative weight 5.4726), DRG 022 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage without CC/MCC, relative weight 3.3534), DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator, relative weight 5.7444), DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC, relative weight 3.9708), DRG 082 (Traumatic Stupor and Coma >1 Hour with MCC, relative weight 2.2928) and 5 more, 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 was added in FY2023, effective October 1, 2022.
7th character
Ainitial encounter
CC/MCC status for this injury by encounter: MCC for A; Neither CC nor MCC for D, S.
Other encounter types for S06.37A:
Notes that apply from higher levels
Instructions written at a parent level also apply to S06.37AA.
› 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
MDC 01 · Diseases and Disorders of the Nervous System
MDC 01 · Diseases and Disorders of the Nervous System
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2023 (effective 10/1/2022): Added
- No changes since FY2023.
Common questions about S06.37AA
Is S06.37AA billable?
- Yes. S06.37AA 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 S06.37AA 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 S06.37AA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S06.37AA as a principal diagnosis.
Is S06.37AA a CC or MCC?
- S06.37AA is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does S06.37AA group to?
- S06.37AA is used in the MS-DRG v44.0 logic for MS-DRG 020 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage with MCC), MS-DRG 021 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage with CC), MS-DRG 022 (Intracranial Vascular Procedures with Principal Diagnosis Hemorrhage without CC/MCC), MS-DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator), MS-DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC), MS-DRG 082 (Traumatic Stupor and Coma >1 Hour with MCC) and 5 more. Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.