2026 ICD-10-CM Diagnosis Code I80.251Phlebitis and thrombophlebitis of right calf muscular vein

ICD-10-CM Codes›I00–I99›I80-I89›I80

ICD-10-CM I80.251
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I80.251 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of right calf muscular 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.

Code Identity

ICD-10-CM Code
I80.251
Billable Status
Yes — Valid for Submission
Code Describes
Phlebitis and thrombophlebitis of right calf muscular vein
Short Description
Phlebitis and thrombophlebitis of right calf muscular vein
Same as the full description in the CMS dataset.
Parent Code
I80.25
Phlebitis and thrombophlebitis of calf muscular vein

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI80Phlebitis and thrombophlebitis
This CodeI80.251Phlebitis and thrombophlebitis of right calf muscular vein

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.

Code History & ChangesHistory

Replacement I80.251 replaces the following previously assigned code(s):

  • I80.291 - Phlebitis and thombophlb of deep vessels of r low extrem
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 I80.251Overview

Is I80.251 (Phlebitis and thrombophlebitis of calf muscular vein) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of right calf muscular vein on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I80.251 group to?

When phlebitis and thrombophlebitis of right calf muscular 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.