2026 ICD-10-CM Diagnosis Code I77.9Disorder of arteries and arterioles, unspecified

ICD-10-CM Codes›I00–I99›I70-I79›I77

ICD-10-CM I77.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I77.9 is a billable ICD-10-CM diagnosis code for disorder of arteries and arterioles, unspecified. 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 Other specified and unspecified circulatory disease.

Code Identity

ICD-10-CM Code
I77.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of arteries and arterioles, unspecified
Short Description
Disorder of arteries and arterioles, unspecified
Same as the full description in the CMS dataset.
Parent Code
I77
Other disorders of arteries and arterioles

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI77Other disorders of arteries and arterioles
This CodeI77.9Disorder of arteries and arterioles, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormality of abdominal aorta
  • Abnormality of thoracoabdominal aorta
  • Acquired abnormality of aorta due to congenital heart anomaly
  • Arterial complication of procedure
  • Ascending aorta abnormality
  • Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • Complication of arterial duct due to and following procedure
  • Disease of non-coronary systemic artery
  • Disorder of aorta
  • Disorder of aorta due to and following correction of congenital heart anomaly
  • Disorder of aortic arch and descending aorta
  • Disorder of arteriole
  • Disorder of artery
  • Disorder of artery caused by ionizing radiation
  • Disorder of artery of neck
  • Disorder of carotid artery
  • Disorder of coronary artery
  • Disorder of thoracic aorta
  • Erectile dysfunction due to disorder of artery
  • Erectile dysfunction due to disorder of blood vessel
  • Ischemia of feet
  • Ischemic foot
  • Lower limb ischemia
  • Peripheral arterial occlusive disease
  • Trash foot
  • White matter disorder co-occurrent and due to cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

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.

    • Arteriopathy
    • Disease, diseased
      • aorta (nonsyphilitic)
    • Disease, diseased
      • arterial
    • Disease, diseased
      • arteriolar (generalized) (obliterative)
    • Disease, diseased
      • artery
    • Occlusion, occluded
      • artery
        • peripheral

Clinical ClassificationClinical

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

CCSR CIR032
Other specified and unspecified circulatory disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Peripheral Arterial Occlusive Disease

    disorder caused by the occlusion of the lumen of the peripheral arteries. causes include atherosclerosis, inflammatory processes, thrombosis, and embolism. the arterial occlusion results in chronic or acute pain usually in the lower limbs due to muscle ischemia.

Patient EducationClinical

Vascular Diseases

Your vascular system is your body's network of blood vessels. It includes your:

The full article covers:

  • What are vascular diseases?
  • What causes vascular diseases?
  • Who is at risk for vascular diseases?
  • What are the symptoms of vascular diseases?
  • How are vascular diseases diagnosed?
  • How are vascular diseases treated?
  • Can vascular diseases be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I77.9 to ICD-9-CMHistory

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

ICD-9-CM
447.9 Arterial disease 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 I77.9Overview

Is I77.9 (Other disorders of arteries and arterioles) a billable code?

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

What MS-DRG does I77.9 group to?

When disorder of arteries and arterioles, unspecified 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 I77.9?

Under the General Equivalence Mappings, disorder of arteries and arterioles, unspecified converts to ICD-9-CM 447.9 (arterial disease 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.