U.S. category index · FY 2027

I ICD-10-CM Categories: Category Index

Browse 80 top-level ICD-10-CM categories beginning with I, then follow their complete FY 2027 child-code hierarchies.

Complete category list

Categories beginning with I

Open a category to continue through its complete hierarchy of more specific codes.

Rheumatic fever without heart involvement

Rheumatic fever with heart involvement

Rheumatic chorea

Rheumatic mitral valve diseases

Rheumatic aortic valve diseases

Rheumatic tricuspid valve diseases

Multiple valve diseases

Other rheumatic heart diseases

Essential (primary) hypertension

Hypertensive heart disease

Hypertensive chronic kidney disease

Hypertensive heart and chronic kidney disease

Secondary hypertension

Hypertensive crisis

Other hypertension

Angina pectoris

Acute myocardial infarction

Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction

Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

Other acute ischemic heart diseases

Chronic ischemic heart disease

Pulmonary embolism

Other pulmonary heart diseases

Other diseases of pulmonary vessels

Acute pericarditis

Other diseases of pericardium

Pericarditis in diseases classified elsewhere

Acute and subacute endocarditis

Nonrheumatic mitral valve disorders

Nonrheumatic aortic valve disorders

Nonrheumatic tricuspid valve disorders

Nonrheumatic pulmonary valve disorders

Endocarditis, valve unspecified

Endocarditis and heart valve disorders in diseases classified elsewhere

Acute myocarditis

Myocarditis in diseases classified elsewhere

Cardiomyopathy

Cardiomyopathy in diseases classified elsewhere

Atrioventricular and left bundle-branch block

Other conduction disorders

Cardiac arrest

Paroxysmal tachycardia

Atrial fibrillation and flutter

Other cardiac arrhythmias

Heart failure

Complications and ill-defined descriptions of heart disease

Other heart disorders in diseases classified elsewhere

Non-ischemic myocardial injury (non-traumatic)

Nontraumatic subarachnoid hemorrhage

Nontraumatic intracerebral hemorrhage

Other and unspecified nontraumatic intracranial hemorrhage

Cerebral infarction

Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

Other cerebrovascular diseases

Cerebrovascular disorders in diseases classified elsewhere

Sequelae of cerebrovascular disease

Atherosclerosis

Aortic aneurysm and dissection

Other aneurysm

Other peripheral vascular diseases

Arterial embolism and thrombosis

Atheroembolism

Septic arterial embolism

Other disorders of arteries and arterioles

Diseases of capillaries

Disorders of arteries, arterioles and capillaries in diseases classified elsewhere

Phlebitis and thrombophlebitis

Portal vein thrombosis

Other venous embolism and thrombosis

Varicose veins of lower extremities

Esophageal varices

Varicose veins of other sites

Other disorders of veins

Nonspecific lymphadenitis

Other noninfective disorders of lymphatic vessels and lymph nodes

Hypotension

Gangrene, not elsewhere classified

Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified

Other and unspecified disorders of circulatory system

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This category index is generated from Vero’s repository-backed ICD-10-CM hierarchy. Every listed category is a top-level record, and each linked category page exposes its direct child codes.

Review the CDC/NCHS ICD-10-CM source

Category navigation

Frequently asked questions

Which ICD-10-CM categories begin with I?

This index lists 80 top-level categories beginning with I from Vero’s FY 2027 U.S. ICD-10-CM reference dataset.

How do I find a more specific I code?

Open a category below, then follow its linked child-code hierarchy until you reach the code supported by the documentation.

Which ICD-10-CM release does this I index use?

The index uses the FY 2027 U.S. ICD-10-CM release and the repository-backed hierarchy displayed on each linked code page.

Is every I category billable?

No. These are top-level categories used for navigation. Follow the hierarchy to a sufficiently specific code and confirm the active code set, official guidance, and payer requirements.

Ready to transform your clinical documentation?

Join Vero and see how effortless documentation can be.

No credit card required

Cancel anytime