I25.9 Chronic ischemic heart disease, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Ischemic heart disease (chronic) NOS

Applies from I25 Chronic ischemic heart disease

Excludes2 (not included here)

• non-ischemic myocardial injury (I5A)

Use additional code

• code to identify:
• chronic total occlusion of coronary artery (I25.82)
• 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)

Risk adjustment (HCC)

• RxHCC V08: HCC 188 — Coronary Artery Disease

MS-DRG index

Defines the logic of DRG(s) 302-303 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 414.8 Other specified forms of chronic ischemic heart disease (approximate)
• 414.9 Chronic ischemic heart disease, unspecified (approximate)

Code annotations containing back-references to I25.9

Back-references to I25.9

• Type 1 Excludes: I24.9 Acute ischemic heart disease, unspecified ("ischemic heart disease (chronic) NOS (I25.9)")

Back-references to I25

• Type 2 Excludes: I74 Arterial embolism and thrombosis ("coronary embolism and thrombosis (I21-I25)")
• Type 2 Excludes: I82 Other venous embolism and thrombosis ("coronary (I21-I25)")

Diagnosis Index entries for I25.9

• Deformity › artery (congenital) (peripheral) NOS › coronary (acquired)
• Deformity › coronary artery (acquired)
• Disease, diseased › heart (organic) › ischemic (chronic or with a stated duration of over 4 weeks)
• Ischemia, ischemic › heart (chronic or with a stated duration of over 4 weeks)
• Ischemia, ischemic › myocardium, myocardial (chronic or with a stated duration of over 4 weeks)
• Ischemia, ischemic › supply (coronary)

Nearby codes

• I25.82 Chronic total occlusion of coronary artery
• I25.83 Coronary atherosclerosis due to lipid rich plaque
• I25.84 Coronary atherosclerosis due to calcified coronary lesion
• I25.85 Chronic coronary microvascular dysfunction
• I25.89 Other forms of chronic ischemic heart disease
• I25.9 Chronic ischemic heart disease, unspecified (this code)