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ICD-10-CM Code R40.4
Transient alteration of awareness

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

R40.4 is a billable ICD code used to specify a diagnosis of transient alteration of awareness. A 'billable code' is detailed enough to be used to specify a medical diagnosis.


The ICD code R40 is used to code Altered level of consciousness

An altered level of consciousness is any measure of arousal other than normal. Level of consciousness (LOC) is a measurement of a person's arousability and responsiveness to stimuli from the environment. A mildly depressed level of consciousness or alertness may be classed as lethargy, someone in this state can be aroused with little difficulty. People who are obtunded have a more depressed level of consciousness and cannot be fully aroused. Those who are not able to be aroused from a sleep-like state are said to be stuporous. Coma is the inability to make any purposeful response. Scales such as the Glasgow coma scale have been designed to measure the level of consciousness.

ICD 9 Code: 780.0

An intracranial hemorrhage, one cause of altered level of consciousness

Source: Wikipedia

MS-DRG Mapping

  • DRG Group #884 - Organic disturbances and mental retardation.

ICD-10-CM Alphabetical Index References for 'R40.4 - Transient alteration of awareness'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code R40.4. Click on any term below to browse the alphabetical index.

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

Transient alteration of awareness (exact match)

This is the official exact match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that in all cases where the ICD9 code 780.02 was previously used, R40.4 is the appropriate modern ICD10 code.


Parent Code: R40 - Somnolence, stupor and coma

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/R404