2026 ICD-10-CM Diagnosis Code I87.321Chronic venous hypertension (idiopathic) with inflammation of right lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I87

ICD-10-CM I87.321
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I87.321 is a billable ICD-10-CM diagnosis code for chronic venous hypertension (idiopathic) with inflammation 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postthrombotic syndrome and venous insufficiency/hypertension.

Code Identity

ICD-10-CM Code
I87.321
Billable Status
Yes — Valid for Submission
Code Describes
Chronic venous hypertension (idiopathic) with inflammation of right lower extremity
Short Description
Chronic venous hypertension w inflammation of r low extrem
Parent Code
I87.32
Chronic venous hypertension (idiopathic) with inflammation

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI87Other disorders of veins
This CodeI87.321Chronic venous hypertension (idiopathic) with inflammation of right lower extremity

Clinical ClassificationClinical

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

CCSR CIR036
Postthrombotic syndrome and venous insufficiency/hypertension
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Convert I87.321 to ICD-9-CMHistory

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

ICD-9-CM
459.32 Chr venous hypr w inflam
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 I87.321Overview

Is I87.321 (Chronic venous hypertension (idiopathic) with inflammation) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic venous hypertension (idiopathic) with inflammation of right lower extremity on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I87.321 group to?

When chronic venous hypertension (idiopathic) with inflammation 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 I87.321?

Under the General Equivalence Mappings, chronic venous hypertension (idiopathic) with inflammation of right lower extremity converts to ICD-9-CM 459.32 (chr venous hypr w inflam). 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.