R40.4 — Transient alteration of awareness
Is R40.4 billable?
Yes — R40.4 is billable for FY2027. R40.4 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. R40.4 may be submitted for encounters from October 1, 2026 through September 30, 2027.
R40.4 at a glance
| Code | R40.4 |
|---|---|
| Description | Transient alteration of awareness |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does R40.4 group to?
R40.4 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 884Organic Disturbances and Intellectual Disabilitymedical
How is R40.4 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to R40.4. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Alteration, Altered › awareness › transient (of)
Excludes1 — never code together — inherited from R40
The conditions below can never be reported together with R40.4 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 18
The conditions below are not part of R40.4, but a patient may have both at the same time. When documentation supports it, R40.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from R40-R46
The conditions below are not part of R40.4, but a patient may have both at the same time. When documentation supports it, R40.4 and the excluded code may both be reported.
- symptoms and signs constituting part of a pattern of mental disorder (F01-F99)
How long has R40.4 existed?
R40.4 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.