2026 ICD-10-CM Diagnosis Code I80.8Phlebitis and thrombophlebitis of other sites

ICD-10-CM Codes›I00–I99›I80-I89›I80

ICD-10-CM I80.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I80.8 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of other sites. 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
I80.8
Billable Status
Yes — Valid for Submission
Code Describes
Phlebitis and thrombophlebitis of other sites
Short Description
Phlebitis and thrombophlebitis of other sites
Same as the full description in the CMS dataset.
Parent Code
I80
Phlebitis and thrombophlebitis

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI80Phlebitis and thrombophlebitis
This CodeI80.8Phlebitis and thrombophlebitis of other sites

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral jugular vein thrombophlebitis
  • Bilateral upper limb superficial vein thrombophlebitis
  • Bilateral upper limb vein thrombophlebitis
  • Left subclavian vein thrombophlebitis
  • Lemierre syndrome
  • Orbital thrombophlebitis
  • Retinal phlebitis
  • Right subclavian vein thrombophlebitis
  • Septic thrombophlebitis
  • Superficial thrombophlebitis of basilic vein
  • Superficial thrombophlebitis of cephalic vein
  • Thrombophlebitis of axillary vein
  • Thrombophlebitis of breast
  • Thrombophlebitis of deep vein of left upper limb
  • Thrombophlebitis of deep vein of right upper limb
  • Thrombophlebitis of deep veins of upper extremities
  • Thrombophlebitis of internal jugular vein
  • Thrombophlebitis of left axillary vein
  • Thrombophlebitis of left jugular vein
  • Thrombophlebitis of mesenteric vein
  • Thrombophlebitis of pelvic vein
  • Thrombophlebitis of retinal vein
  • Thrombophlebitis of right axillary vein
  • Thrombophlebitis of right jugular vein
  • Thrombophlebitis of subclavian vein
  • Thrombophlebitis of superficial vein of left upper limb
  • Thrombophlebitis of superficial vein of right upper limb
  • Thrombophlebitis of superficial veins of upper extremities
  • Thrombophlebitis of upper extremities
  • Thrombophlebitis of vein of left upper limb
  • Thrombophlebitis of vein of right upper limb
  • Thrombophlebitis of vena cava
  • Thrombosis of cephalic vein
  • Thrombosis of internal jugular vein
  • Thrombosis of mesenteric vein
  • Thrombosis of vena cava

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Mondor's disease
    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • breast, superficial
    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • chest wall, superficial
    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • hepatic veins
    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • specified site NEC
    • Phlebitis(infective) (pyemic) (septic) (suppurative)
      • umbilicus
    • Pyelophlebitis
    • Syndrome
      • Lemierre
    • Thrombophlebitis
      • hepatic (vein)
    • Thrombophlebitis
      • specified site NEC

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

Clinical InformationClinical

  • Lemierre Syndrome

    a superinfection of the damaged oropharyngeal mucosa by fusobacterium necrophorum leading to the secondary septic thrombophlebitis of the internal jugular vein.

Convert I80.8 to ICD-9-CMHistory

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

ICD-9-CM
451.89 Thrombophlebitis 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I80.8Overview

Is I80.8 (Phlebitis and thrombophlebitis) a billable code?

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

What MS-DRG does I80.8 group to?

When phlebitis and thrombophlebitis of other sites 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 I80.8?

Under the General Equivalence Mappings, phlebitis and thrombophlebitis of other sites converts to ICD-9-CM 451.89 (thrombophlebitis NEC). 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.