ICD-10-CM 2027
ICD-10 code for functioning
From the official ICD-10-CM alphabetic index entry “Functioning, intellectual, borderline”. Page updated September 29, 2026.
About coding functioning
The ICD-10-CM code for functioning is R41.83 (Borderline intellectual functioning).
Within R41.8 (other symptoms and signs involving cognitive functions and awareness), R41.83 is specifically for borderline intellectual functioning. Related codes cover age-related cognitive decline (R41.81), Altered mental status, unspecified (R41.82), other specified cognitive deficit (R41.84), Anosognosia (R41.85) and other symptoms and signs involving cognitive functions and awareness (R41.89).
Don't report R41.83 together with the conditions in its Excludes1 note: intellectual disabilities (F70-F79).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for R41.83)
Common questions about functioning ICD-10 codes
What is the ICD-10 code for functioning?
- R41.83 — Borderline intellectual functioning.
Is R41.83 billable?
- Yes. R41.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R41.83 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is R41.83 a CC or MCC?
- No. R41.83 is neither a CC nor an MCC under MS-DRG v44.0.