R29.740 NIHSS score 40

Billable ICD-10-CM code, FY2026.

Applies from R29.7 National Institutes of Health Stroke Scale (NIHSS) score

Code first

• the type of cerebral infarction (I63.-)

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• NoD.x (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to R29.740

Back-references to R29.7

• Use Additional: I60 Nontraumatic subarachnoid hemorrhage ("code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)")
• Use Additional: I61 Nontraumatic intracerebral hemorrhage ("code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)")
• Use Additional: I62 Other and unspecified nontraumatic intracranial hemorrhage ("code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)")
• Use Additional: I63 Cerebral infarction ("code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)")

Nearby codes

• R29.736 NIHSS score 36
• R29.737 NIHSS score 37
• R29.738 NIHSS score 38
• R29.739 NIHSS score 39
• R29.74 NIHSS score 40-42
• R29.740 NIHSS score 40 (this code)
• R29.741 NIHSS score 41
• R29.742 NIHSS score 42
• R29.8 Other symptoms and signs involving the nervous and musculoskeletal systems
• R29.81 Other symptoms and signs involving the nervous system
• R29.810 Facial weakness