2026 ICD-10-CM Diagnosis Code I82.B12Acute embolism and thrombosis of left subclavian vein

ICD-10-CM Codes›I00–I99›I80-I89›I82

ICD-10-CM I82.B12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I82.B12 is a billable ICD-10-CM diagnosis code for acute embolism and thrombosis of left subclavian 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. Coders also document this condition as acute thrombosis of left subclavian vein. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.

Code Identity

ICD-10-CM Code
I82.B12
Billable Status
Yes — Valid for Submission
Code Describes
Acute embolism and thrombosis of left subclavian vein
Short Description
Acute embolism and thrombosis of left subclavian vein
Same as the full description in the CMS dataset.
Parent Code
I82.B1
Acute embolism and thrombosis of subclavian 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.B12Acute embolism and thrombosis of left subclavian vein

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute thrombosis of left subclavian vein
  • Acute thrombosis of subclavian vein
  • Acute thrombosis of vein of thorax

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

Convert I82.B12 to ICD-9-CMHistory

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

ICD-9-CM
453.85 Ac embl subclav veins
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.B12Overview

Is I82.B12 (Acute embolism and thrombosis of subclavian vein) a billable code?

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

What MS-DRG does I82.B12 group to?

When acute embolism and thrombosis of left subclavian 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.

What is the ICD-9 equivalent of I82.B12?

Under the General Equivalence Mappings, acute embolism and thrombosis of left subclavian vein converts to ICD-9-CM 453.85 (ac embl subclav veins). 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.