Alphabetic Index FY2027

I67.81

Acute cerebrovascular insufficiency

FY2027Chapter 9: Diseases of the circulatory system/I60–I69 Cerebrovascular diseases

BillableComplete code, valid to report
Care settingsHome Health Primary · Neuro RehabilitationHospital CC

I67.81 (also written I6781) is a billable ICD-10-CM diagnosis code for acute cerebrovascular insufficiency. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 17 codes in category I67 (Other cerebrovascular diseases). The Alphabetic Index lists it under 3 entries. Its coding notes include a Use additional code instruction, 3 Excludes1 entries and 11 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (8 notes)
Inherited from I60–I69 Cerebrovascular diseases
  • code to identify presence of:
    • alcohol abuse and dependence (F10.-)
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • hypertension (I10-I1A)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from I67 Other cerebrovascular diseases
  • Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5-)
  • Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-)
Also from chapter/block level (1 note)
Inherited from I60–I69 Cerebrovascular diseases
  • traumatic intracranial hemorrhage (S06.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from I67 Other cerebrovascular diseases
  • sequelae of the listed conditions (I69.8)
Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Neuro Rehabilitation clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Hospital CC

Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 182 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.

Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix C

Inclusion terms

Conditions classified to this code.

This code
  • Acute cerebrovascular insufficiency unspecified as to location or reversibility

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 3 entries