2026 ICD-10-CM Diagnosis Code I75.021Atheroembolism of right lower extremity

ICD-10-CM Codes›I00–I99›I70-I79›I75

ICD-10-CM I75.021
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I75.021 is a billable ICD-10-CM diagnosis code for atheroembolism of right lower extremity. 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 atheroembolism of right lower limb. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Aortic and peripheral arterial embolism or thrombosis.

Code Identity

ICD-10-CM Code
I75.021
Billable Status
Yes — Valid for Submission
Code Describes
Atheroembolism of right lower extremity
Short Description
Atheroembolism of right lower extremity
Same as the full description in the CMS dataset.
Parent Code
I75.02
Atheroembolism of lower extremity

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI75Atheroembolism
This CodeI75.021Atheroembolism of right lower extremity

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Atheroembolism of right lower limb
  • Embolism of artery of right lower limb

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

Convert I75.021 to ICD-9-CMHistory

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

ICD-9-CM
445.02 Atheroembolism,lower ext
Approximate The match is approximate rather than exact.

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 I75.021Overview

Is I75.021 (Atheroembolism of lower extremity) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report atheroembolism of right lower extremity on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I75.021 group to?

When atheroembolism of right lower extremity 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 I75.021?

Under the General Equivalence Mappings, atheroembolism of right lower extremity converts to ICD-9-CM 445.02 (atheroembolism,lower ext). The mapping is approximate, so confirm the match fits the documentation.

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.