2026 ICD-10-CM Diagnosis Code I73.1Thromboangiitis obliterans [Buerger's disease]

ICD-10-CM Codes›I00–I99›I70-I79›I73

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

I73.1 is a billable ICD-10-CM diagnosis code for thromboangiitis obliterans [Buerger's disease]. 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. Coders also document this condition as neuropathy in thromboangiitis obliterans. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Peripheral and visceral vascular disease.

Code Identity

ICD-10-CM Code
I73.1
Billable Status
Yes — Valid for Submission
Code Describes
Thromboangiitis obliterans [Buerger's disease]
Short Description
Thromboangiitis obliterans [Buerger's disease]
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 CodeI73.1Thromboangiitis obliterans [Buerger's disease]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Neuropathy in thromboangiitis obliterans
  • Presenile gangrene
  • Thromboangiitis
  • Thromboangiitis obliterans

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.

    • Buerger's disease(thromboangiitis obliterans)
    • Disease, diseased
      • Buerger's (thromboangiitis obliterans)
    • Gangrene, gangrenous(connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)
      • presenile
    • Thromboangiitis
    • Thromboangiitis
      • obliterans (general)

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

  • Thromboangiitis Obliterans

    a non-atherosclerotic, inflammatory thrombotic disease that commonly involves small and medium-sized arteries or veins in the extremities. it is characterized by occlusive thrombosis and fibrosis in the vascular wall leading to digital and limb ischemia and ulcerations. thromboangiitis obliterans is highly associated with tobacco smoking.

Patient EducationClinical

Vasculitis

Vasculitis is an inflammation of the blood vessels. It happens when the body's immune system attacks the blood vessel by mistake. It can happen because of an infection, a medicine, or another disease. The cause is often unknown.

Read the full article at MedlinePlus

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

Convert I73.1 to ICD-9-CMHistory

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

ICD-9-CM
443.1 Thromboangiit obliterans
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 I73.1Overview

Is I73.1 (Other peripheral vascular diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report thromboangiitis obliterans [Buerger's disease] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I73.1 group to?

When thromboangiitis obliterans [Buerger's disease] 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 I73.1?

Under the General Equivalence Mappings, thromboangiitis obliterans [Buerger's disease] converts to ICD-9-CM 443.1 (thromboangiit obliterans). 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.