2026 ICD-10-CM Diagnosis Code I82.4Z1Acute embolism and thrombosis of unspecified deep veins of right distal lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I82

ICD-10-CM I82.4Z1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I82.4Z1 is a billable ICD-10-CM diagnosis code for acute embolism and thrombosis of unspecified deep veins of right distal 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 acute deep venous thrombosis of calf. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.

Code Identity

ICD-10-CM Code
I82.4Z1
Billable Status
Yes — Valid for Submission
Code Describes
Acute embolism and thrombosis of unspecified deep veins of right distal lower extremity
Short Description
Ac emblsm and thombos unsp deep veins of r dist low extrm
Parent Code
I82.4Z
Acute embolism and thrombosis of unspecified deep veins of distal lower extremity

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 CodeI82.4Z1Acute embolism and thrombosis of unspecified deep veins of right distal lower extremity

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute deep venous thrombosis of calf
  • Acute deep venous thrombosis of right calf

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

Patient EducationClinical

Deep Vein Thrombosis

Deep vein thrombosis, or DVT, is a blood clot that forms in a vein deep in the body. Most deep vein clots occur in the lower leg or thigh. If the vein swells, the condition is called thrombophlebitis. A deep vein thrombosis can break loose and cause a serious problem in the lung, called a pulmonary embolism.

Read the full article at MedlinePlus

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

Convert I82.4Z1 to ICD-9-CMHistory

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

ICD-9-CM
453.42 Ac DVT/emb distl low 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 I82.4Z1Overview

Is I82.4Z1 a billable code?

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

What MS-DRG does I82.4Z1 group to?

When acute embolism and thrombosis of unspecified deep veins of right distal 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 I82.4Z1?

Under the General Equivalence Mappings, acute embolism and thrombosis of unspecified deep veins of right distal lower extremity converts to ICD-9-CM 453.42 (ac DVT/emb distl low ext). The mapping is approximate, so confirm the match fits the documentation.

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.