2026 ICD-10-CM Diagnosis Code I82.459Acute embolism and thrombosis of unspecified peroneal vein

ICD-10-CM Codes›I00–I99›I80-I89›I82

ICD-10-CM I82.459
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I82.459 is a billable ICD-10-CM diagnosis code for acute embolism and thrombosis of unspecified peroneal vein. 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. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.

Code Identity

ICD-10-CM Code
I82.459
Billable Status
Yes — Valid for Submission
Code Describes
Acute embolism and thrombosis of unspecified peroneal vein
Short Description
Acute embolism and thrombosis of unspecified peroneal vein
Same as the full description in the CMS dataset.
Parent Code
I82.45
Acute embolism and thrombosis of peroneal vein

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI82Other venous embolism and thrombosis
This CodeI82.459Acute embolism and thrombosis of unspecified peroneal vein

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I82.459.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Clinical ClassificationClinical

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

CCSR CIR033
Acute phlebitis; thrombophlebitis and thromboembolism
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement I82.459 replaces the following previously assigned code(s):

  • I82.499 - Acute embolism and thrombosis of deep vein of unsp low extrm
FY 2020AddedAdded to the ICD-10-CM code setEffective October 1, 2019.
FY 2021–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I82.459Overview

Is I82.459 (Acute embolism and thrombosis of peroneal vein) a billable code?

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

What MS-DRG does I82.459 group to?

When acute embolism and thrombosis of unspecified peroneal vein 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.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.