2026 ICD-10-CM Diagnosis Code I73.9Peripheral vascular disease, unspecified

ICD-10-CM Codes›I00–I99›I70-I79›I73

ICD-10-CM I73.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I73.9 is a billable ICD-10-CM diagnosis code for peripheral vascular disease, 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 Peripheral and visceral vascular disease.

Code Identity

ICD-10-CM Code
I73.9
Billable Status
Yes — Valid for Submission
Code Describes
Peripheral vascular disease, unspecified
Short Description
Peripheral vascular disease, unspecified
Same as the full description in the CMS dataset.
Parent Code
I73
Other peripheral vascular diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI73Other peripheral vascular diseases
This CodeI73.9Peripheral vascular disease, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arm claudication
  • Arterial insufficiency of flap
  • Arteriospasm
  • Dermatosis resulting from vascular insufficiency
  • Dietetic microangiopathy
  • Edema due to increased peripheral blood flow
  • Gangrene due to peripheral vascular disease
  • Intermittent claudication
  • Loss of protective sensation of skin
  • Occupational cutaneous vascular disorder
  • Paroxysmal vascular dilatation
  • Peripheral arterial disease
  • Peripheral arterial insufficiency
  • Peripheral artery spasm
  • Peripheral vascular complication
  • Peripheral vascular complication of procedure
  • Peripheral vascular complications of care
  • Peripheral vascular disease
  • Peripheral vascular disease associated with another disorder
  • Peripheral vascular disease of foot with loss of protective sensation
  • Peripheral vascular disease of foot with loss of protective sensation and deformity
  • Peripheral vascular disease with rest pain
  • Peripheral vasoconstriction
  • Poor peripheral circulation
  • Posterior tibial artery insufficiency
  • Renal failure associated with renal vascular disease
  • Renal vascular disorder
  • Vascular disease of the skin
  • Vascular disorder of extremity
  • Vascular disorder of lower extremity
  • Vascular insufficiency of limb
  • Vasodilatation
  • Vasospasm
  • Venospasm

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Intermittent claudication
  • Peripheral angiopathy NOS
  • Spasm of artery

Type 1 Excludes

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.

    • Angina(attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
      • cruris
    • Angiopathia, angiopathy
      • peripheral
    • Angiospasm(peripheral) (traumatic) (vessel)
    • Angiospastic disease or edema
    • Arteriospasm
    • Change(s) (in) (of)
      • vasomotor
    • Charcot's
      • syndrome (intermittent claudication)
    • Claudication(intermittent)
    • Dilatation
      • vasomotor
    • Disease, diseased
      • angiospastic
    • Disease, diseased
      • arterial
        • peripheral
    • Disease, diseased
      • artery
        • peripheral
    • Disease, diseased
      • peripheral
        • arterial
    • Disease, diseased
      • peripheral
        • vascular NOS
    • Disease, diseased
      • small vessel
    • Disease, diseased
      • terminal vessel
    • Disease, diseased
      • vascular
        • obliterative
          • peripheral
    • Disease, diseased
      • vascular
        • peripheral (occlusive)
    • Disease, diseased
      • vasomotor
    • Disease, diseased
      • vasospastic
    • Disturbance(s)
      • vasomotor
    • Disturbance(s)
      • vasospastic
    • Dysbasia
      • angiosclerotica intermittens
    • Edema, edematous(infectious) (pitting) (toxic)
      • angiospastic
    • Insufficiency, insufficient
      • arterial
        • peripheral
    • Insufficiency, insufficient
      • peripheral vascular (arterial)
    • Insufficiency, insufficient
      • vascular
        • peripheral
    • Labile
      • vasomotor system
    • Microangiopathy(peripheral)
    • Phenomenon
      • vasospastic
    • Reflex
      • vasoconstriction
    • Spasm(s), spastic, spasticity
      • artery
    • Spasm(s), spastic, spasticity
      • vascular
    • Spasm(s), spastic, spasticity
      • vasomotor
    • Syndrome
      • Charcot's (angina cruris) (intermittent claudication)
    • Syndrome
      • vasomotor
    • Vascular
      • spasm
    • Vasodilation
    • Vasospasm(vasoconstriction)
    • Vasospasm(vasoconstriction)
      • peripheral NOS

Clinical ClassificationClinical

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

CCSR CIR026
Peripheral and visceral vascular disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Intermittent Claudication

    a symptom complex characterized by pain and weakness in skeletal muscle group associated with exercise, such as leg pain and weakness brought on by walking. such muscle limpness disappears after a brief rest and is often relates to arterial stenosis; muscle ischemia; and accumulation of lactate.

  • Peripheral Arterial Disease

    lack of perfusion in the extremities resulting from atherosclerosis. it is characterized by intermittent claudication, and an ankle brachial index of 0.9 or less.

  • Arteriospasm

    an abnormal spasm of an artery.

  • Coronary Vasospasm

    sudden coronary artery smooth muscle contraction leading to lumen constriction and decreased blood flow.

  • Vasospasm

    sudden and often, paroxysmal contractions of the muscular wall of blood vessels.

Convert I73.9 to ICD-9-CMHistory

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

ICD-9-CM
443.9 Periph vascular dis 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 I73.9Overview

Is I73.9 (Other peripheral vascular diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report peripheral vascular disease, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I73.9 group to?

When peripheral vascular disease, 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 I73.9?

Under the General Equivalence Mappings, peripheral vascular disease, unspecified converts to ICD-9-CM 443.9 (periph vascular dis 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.