R41.82 Altered mental status, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Change in mental status NOS

Excludes1 (never code together)

• altered level of consciousness (R40.-)
• altered mental status due to known condition - code to condition
• delirium NOS (R41.0)

Applies from R41 Other symptoms and signs involving cognitive functions and awareness

Excludes1 (never code together)

• dissociative [conversion] disorders (F44.-)
• mild cognitive impairment of uncertain or unknown etiology (G31.84)

MS-DRG index

Defines the logic of DRG(s) 947-948 in MDC 23.

Approximate ICD-9-CM (GEMs)

• 780.97 Altered mental status (approximate)

Code annotations containing back-references to R41.82

Back-references to R41.82

• Type 1 Excludes: F06.7 Mild neurocognitive disorder due to known physiological condition ("altered mental status (R41.82)")
• Type 1 Excludes: F06.7 Mild neurocognitive disorder due to known physiological condition ("change in mental status (R41.82)")
• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("altered mental status (R41.82)")
• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("change in mental status (R41.82)")

Diagnosis Index entries for R41.82

• Alteration (of), Altered › mental status
• Change (s) (in) (of) › mental status
• Symptoms NEC › involving › awareness › altered mental status
• Symptoms NEC › involving › cognitive functions › altered mental status

Nearby codes

• R41.2 Retrograde amnesia
• R41.3 Other amnesia
• R41.4 Neurologic neglect syndrome
• R41.8 Other symptoms and signs involving cognitive functions and awareness
• R41.81 Age-related cognitive decline
• R41.82 Altered mental status, unspecified (this code)
• R41.83 Borderline intellectual functioning
• R41.84 Other specified cognitive deficit
• R41.840 Attention and concentration deficit
• R41.841 Cognitive communication deficit
• R41.842 Visuospatial deficit