I70.90 Unspecified atherosclerosis

Billable ICD-10-CM code, FY2026.

Applies from I70 Atherosclerosis

Includes

• arteriolosclerosis
• arterial degeneration
• arteriosclerosis
• arteriosclerotic vascular disease
• arteriovascular degeneration
• atheroma
• endarteritis deformans or obliterans
• senile arteritis
• senile endarteritis
• vascular degeneration

Excludes2 (not included here)

• arteriosclerotic cardiovascular disease (I25.1-)
• arteriosclerotic heart disease (I25.1-)
• atheroembolism (I75.-)
• cerebral atherosclerosis (I67.2)
• coronary atherosclerosis (I25.1-)
• mesenteric atherosclerosis (K55.1)
• precerebral atherosclerosis (I67.2)
• primary pulmonary atherosclerosis (I27.0)

Use additional code

• code to identify:
• exposure to environmental tobacco smoke (Z77.22)
• history of tobacco dependence (Z87.891)
• occupational exposure to environmental tobacco smoke (Z57.31)
• tobacco dependence (F17.-)
• tobacco use (Z72.0)

Applies from I70.9 Other and unspecified atherosclerosis

Excludes2 (not included here)

• disorders of pyrophosphate metabolism (E83.82-)

MS-DRG index

Defines the logic of DRG(s) 299-301 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 440.9 Generalized and unspecified atherosclerosis (approximate)

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

• Adult diagnoses (age 15 through 124): Age conflict edit. These diagnoses are clinically expected only in patients age 15 through 124.

Code annotations containing back-references to I70.90

Back-references to I70

• Type 1 Excludes: I77.6 Arteritis, unspecified ("deformans (I70.-)")
• Type 1 Excludes: I77.6 Arteritis, unspecified ("obliterans (I70.-)")
• Type 1 Excludes: I77.6 Arteritis, unspecified ("senile (I70.-)")

Diagnosis Index entries for I70.90

• Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification)
• Atheroma, atheromatous
• Failure, failed › heart (acute) (senile) (sudden) › arteriosclerotic
• Fibrosis, fibrotic › capillary

Nearby codes

• I70.793 Other atherosclerosis of other type of bypass graft(s) of the extremities, bilateral legs
• I70.798 Other atherosclerosis of other type of bypass graft(s) of the extremities, other extremity
• I70.799 Other atherosclerosis of other type of bypass graft(s) of the extremities, unspecified extremity
• I70.8 Atherosclerosis of other arteries
• I70.9 Other and unspecified atherosclerosis
• I70.90 Unspecified atherosclerosis (this code)
• I70.91 Generalized atherosclerosis
• I70.92 Chronic total occlusion of artery of the extremities