2026 ICD-10-CM Diagnosis Code I87.012Postthrombotic syndrome with ulcer of left lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I87

ICD-10-CM I87.012
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I87.012 is a billable ICD-10-CM diagnosis code for postthrombotic syndrome with ulcer of left 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
I87.012
Billable Status
Yes — Valid for Submission
Code Describes
Postthrombotic syndrome with ulcer of left lower extremity
Short Description
Postthrombotic syndrome with ulcer of left lower extremity
Same as the full description in the CMS dataset.
Parent Code
I87.01
Postthrombotic syndrome with ulcer

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 CodeI87.012Postthrombotic syndrome with ulcer of left lower extremity

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Left calf ulcer
  • Left calf ulcer due to post thrombotic syndrome
  • Left foot ulcer due to post thrombotic syndrome
  • Ulcer of left ankle
  • Ulcer of left ankle due to postphlebitic syndrome
  • Ulcer of left lower leg due to postphlebitic syndrome
  • Ulcer of lower extremity due to postphlebitic syndrome

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

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 I87.012 to ICD-9-CMHistory

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

ICD-9-CM
459.11 Postphlebtc synd w ulcer
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 I87.012Overview

Is I87.012 (Postthrombotic syndrome with ulcer) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postthrombotic syndrome with ulcer of left lower extremity on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I87.012 group to?

When postthrombotic syndrome with ulcer of left 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 I87.012?

Under the General Equivalence Mappings, postthrombotic syndrome with ulcer of left lower extremity converts to ICD-9-CM 459.11 (postphlebtc synd w ulcer). 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.