R40.4
BillableTransient alteration of awareness
R40.4 is the ICD-10-CM code for Transient alteration of awareness. It is a billable, specific code valid for reimbursement.
R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
What this means — in plain language
MedlinePlus · NIHWhat is delirium? Delirium is a mental state in which you are confused, disoriented, and not able to think or remember clearly. It usually starts suddenly. It is often temporary and treatable. There are three types of delirium: Hypoactive, when you are not active and seem sleepy, tired, or depressed Hyperactive, when you are restless or agitated Mixed, when you change back and forth between being hypoactive and…
Read more about Delirium at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code R40.4?
- R40.4 is the ICD-10-CM code for "Transient alteration of awareness". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
- Is R40.4 a billable code?
- Yes — R40.4 is a billable, specific ICD-10-CM code valid for reimbursement.
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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