2027 ICD-10-CM Diagnosis Code I87.099Postthrombotic syndrome with other complications of unspecified lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I87

ICD-10-CM I87.099
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I87.099 is a billable ICD-10-CM diagnosis code for postthrombotic syndrome with other complications of unspecified lower extremity. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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
I87.099
Billable Status
Yes — Valid for Submission
Code Describes
Postthrombotic syndrome with other complications of unspecified lower extremity
Short Description
Postthrom syndrome w oth complications of unsp low extrm
Parent Code
I87.09
Postthrombotic syndrome with other complications

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 CodeI87.099Postthrombotic syndrome with other complications of unspecified lower extremity

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I87.099: its own notes plus those printed at I87.0 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From I87.0 Postthrombotic syndrome applies to 20 codes
  • chronic venous hypertension without deep vein thrombosis (I87.3-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I87.099, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming I87.099: they are not reported together with it, unless the two conditions are unrelated.

  • I87.3 Chronic venous hypertension (idiopathic)
    chronic venous hypertension due to deep vein thrombosis (I87.0-) names I87.0-, which includes this code

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

Clinical InformationClinical

  • Postthrombotic Syndrome

    a condition caused by one or more episodes of deep vein thrombosis, usually the blood clots are lodged in the legs. clinical features include edema; pain; aching; heaviness; and muscle cramp in the leg. when severe leg swelling leads to skin breakdown, it is called venous stasis ulcer.

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 I87.099 to ICD-9-CMHistory

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

ICD-9-CM
459.19 Postphleb synd comp NEC
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I87.099Overview

Is I87.099 (Postthrombotic syndrome with other complications) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postthrombotic syndrome with other complications of unspecified lower extremity on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I87.099 group to?

When postthrombotic syndrome with other complications of unspecified lower extremity is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.

Can I87.099 be reported with a code from I87.3?

Not as a rule. The Excludes1 note at I87.0, which applies to I87.099, lists "chronic venous hypertension without deep vein thrombosis (I87.3-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of I87.099?

Under the General Equivalence Mappings, postthrombotic syndrome with other complications of unspecified lower extremity converts to ICD-9-CM 459.19 (postphleb synd comp NEC). The mapping is approximate, so confirm the match fits the documentation.