2026 ICD-10-CM Diagnosis Code I74.9Embolism and thrombosis of unspecified artery

ICD-10-CM Codes›I00–I99›I70-I79›I74

ICD-10-CM I74.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I74.9 is a billable ICD-10-CM diagnosis code for embolism and thrombosis of unspecified artery. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 299 through 301. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Aortic and peripheral arterial embolism or thrombosis.

Code Identity

ICD-10-CM Code
I74.9
Billable Status
Yes — Valid for Submission
Code Describes
Embolism and thrombosis of unspecified artery
Short Description
Embolism and thrombosis of unspecified artery
Same as the full description in the CMS dataset.
Parent Code
I74
Arterial embolism and thrombosis

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI74Arterial embolism and thrombosis
This CodeI74.9Embolism and thrombosis of unspecified artery

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute occlusion of artery due to thromboembolus
  • Acute occlusion of artery due to thrombosis
  • Acute occlusion of peripheral artery due to thrombosis
  • Arterial embolism
  • Arterial embolus and thrombosis
  • Arterial insufficiency of flap
  • Arterial obstruction due to paradoxical embolism
  • Arterial obstruction due to thrombotic embolism from aneurysm of artery
  • Arterial obstruction due to thrombotic embolism from aneurysm of ventricle
  • Arterial obstruction due to thrombotic embolism from mural thrombus of heart
  • Arterial thrombosis
  • Arterial thrombosis of flap
  • Arteriovenous fistula thrombosis
  • Atherosclerotic plaque disruption with thrombosis of artery
  • Barium sulfate embolism
  • Cerebrovascular disorder due to paradoxical embolus
  • Congenital arteriovenous fistula thrombosis
  • Drug-induced embolism
  • Embolic infarction
  • Embolism
  • Embolism due to cardiac myxoma
  • Embolism due to malignant neoplasm
  • Embolism due to non-infective heart valve vegetations
  • Embolism from atrium of heart
  • Embolism from heart
  • Grange syndrome
  • Hereditary dysplasia of blood vessel
  • Methyl methacrylate embolism
  • Microvascular embolism of arteriole
  • Obstetrical blood clot embolism
  • Retraction of blood clot
  • Talc embolism
  • Thromboembolic disorder
  • Thromboembolism due to mural thrombus
  • Thromboembolism due to vegetative endocarditis of heart valve
  • Thromboembolism following infusion, perfusion AND/OR transfusion
  • Thromboembolism from prosthetic heart valve
  • Thrombotic embolism from cardiac atrium
  • Thrombotic embolism from cardiac ventricle
  • Thrombotic infarction
  • Trunk arterial embolus
  • Tumor embolus

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Clot(blood)
      • circulation
    • Embolism(multiple) (paradoxical)
    • Embolism(multiple) (paradoxical)
      • artery
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • artery, arteries (postinfectional)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR030
Aortic and peripheral arterial embolism or thrombosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Embolic Protection Devices

    vascular filters or occlusive devices that provide mechanical protection of the distal end organ from blood clots or embolism-causing debri dislodged during endovascular procedures.

  • Embolism

    blocking of a blood vessel by an embolus which can be a blood clot or other undissolved material in the blood stream.

  • Embolism and Thrombosis

    a collective term for pathological conditions which are caused by the formation of a blood clot (thrombus) in a blood vessel, or by blocking of a blood vessel with an embolus, undissolved materials in the blood stream.

  • Embolism, Air

    blocking of a blood vessel by air bubbles that enter the circulatory system, usually after trauma; surgical procedures, or changes in atmospheric pressure.

  • Embolism, Amniotic Fluid

    blocking of maternal circulation by amniotic fluid that is forced into uterine veins by strong uterine contraction near the end of pregnancy. it is characterized by the sudden onset of severe respiratory distress and hypotension that can lead to maternal death.

  • Embolism, Cholesterol

    blocking of a blood vessel by cholesterol-rich atheromatous deposits, generally occurring in the flow from a large artery to small arterial branches. it is also called arterial-arterial embolization or atheroembolism which may be spontaneous or iatrogenic. patients with spontaneous atheroembolism often have painful, cyanotic digits of acute onset.

  • Embolism, Fat

    blocking of a blood vessel by fat deposits in the circulation. it is often seen after fractures of large bones or after administration of corticosteroids.

  • Embolism, Paradoxical

    blockage of an artery due to passage of a clot (thrombus) from a systemic vein to a systemic artery without its passing through the lung which acts as a filter to remove blood clots from entering the arterial circulation. paradoxical embolism occurs when there is a defect that allows a clot to cross directly from the right to the left side of the heart as in the cases of atrial septal defects or open foramen ovale. once in the arterial circulation, a clot can travel to the brain, block an artery, and cause a stroke.

  • Intracranial Embolism

    blocking of a blood vessel in the skull by an embolus which can be a blood clot (thrombus) or other undissolved material in the blood stream. most emboli are of cardiac origin and are associated with heart diseases. other non-cardiac sources of emboli are usually associated with vascular diseases.

  • Intracranial Embolism and Thrombosis

    embolism or thrombosis involving blood vessels which supply intracranial structures. emboli may originate from extracranial or intracranial sources. thrombosis may occur in arterial or venous structures.

  • Ischemic Stroke

    stroke due to brain ischemia resulting in interruption or reduction of blood flow to a part of the brain. when obstruction is due to a blood clot formed within in a cerebral blood vessel it is a thrombotic stroke. when obstruction is formed elsewhere and moved to block a cerebral blood vessel (see cerebral embolism) it is referred to as embolic stroke. wake-up stroke refers to ischemic stroke occurring during sleep while cryptogenic stroke refers to ischemic stroke of unknown origin.

  • Neoplastic Cells, Circulating

    exfoliate neoplastic cells circulating in the blood and associated with metastasizing tumors.

  • Pulmonary Embolism

    blocking of the pulmonary artery or one of its branches by an embolus.

Convert I74.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
444.9 Arterial embolism NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I74.9Overview

Is I74.9 (Arterial embolism and thrombosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report embolism and thrombosis of unspecified artery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I74.9 group to?

When embolism and thrombosis of unspecified artery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 299, 300, 301, with relative weights from 0.7197 to 1.6327 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I74.9?

Under the General Equivalence Mappings, embolism and thrombosis of unspecified artery converts to ICD-9-CM 444.9 (arterial embolism NOS). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.