2026 ICD-10-CM Diagnosis Code I80.03Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral

ICD-10-CM Codes›I00–I99›I80-I89›I80

ICD-10-CM I80.03
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I80.03 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral. 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
I80.03
Billable Status
Yes — Valid for Submission
Code Describes
Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral
Short Description
Phlbts and thombophlb of superfic vessels of low extrm, bi
Parent Code
I80.0
Phlebitis and thrombophlebitis of superficial vessels of lower extremities

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI80Phlebitis and thrombophlebitis
This CodeI80.03Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral lower limb superficial vein thrombophlebitis
  • Bilateral lower limb vein thrombophlebitis
  • Phlebitis in puerperium
  • Saphenous vein thrombophlebitis
  • Thrombophlebitis in puerperium
  • Thrombophlebitis of bilateral lower limbs in pregnancy
  • Thrombophlebitis of bilateral lower limbs in puerperium
  • Thrombophlebitis of bilateral saphenous veins
  • Thrombophlebitis of left saphenous vein
  • Thrombophlebitis of right saphenous vein
  • Thrombophlebitis of superficial vein of left lower limb
  • Thrombophlebitis of superficial vein of right lower limb

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 I80.03 to ICD-9-CMHistory

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

ICD-9-CM
451.0 Superfic phlebitis-leg
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 I80.03Overview

Is I80.03 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I80.03 group to?

When phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral 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 I80.03?

Under the General Equivalence Mappings, phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral converts to ICD-9-CM 451.0 (superfic phlebitis-leg). 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.