F01.C18Vascular dementia, severe, with other behavioral disturbance

F01.C18 is the ICD-10-CM diagnosis code for vascular dementia, severe, with other behavioral disturbance. It belongs to category F01 (vascular dementia), block F01-F09 (mental disorders due to known physiological conditions) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within F01.C1, choose F01.C18 (other behavioral disturbance) only when documentation doesn't support a more specific option: agitation (F01.C11).

Code first: , if applicable, any causal condition.

Use an additional code, if applicable, to identify wandering in vascular dementia (Z91.83).

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 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

The Medicare Code Editor expects this diagnosis only for patients age 15 through 124.

It was added in FY2023, effective October 1, 2022.