What does ICD-10 code I80 mean?

ICD-10 code I80 is the standardized code used for phlebitis and thrombophlebitis in medical records and coding systems.

When is ICD-10 code I80 used?

Doctors, hospitals, and insurers may use ICD-10 code I80 when recording phlebitis and thrombophlebitis in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code I80 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code I80: Phlebitis and thrombophlebitis

Name: ICD-10 Code I80: Phlebitis and thrombophlebitis
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:13:58.214Z

I80 is an ICD-10 diagnosis entry used to group records related to Phlebitis and thrombophlebitis. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).

When is it used?

May be used when a clinician documents phlebitis and thrombophlebitis in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

9Diseases of the circulatory system (I00-I99)

block

I80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified

currentI80-I89

Official coding notes

Includes

endophlebitis
inflammation, vein
periphlebitis
suppurative phlebitis

Applicable to

, if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)
phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-)

Excludes1 (do not code together)

venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)

Code first

, if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)
phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

CardiologistGeneral Physician

Sibling codes

I81Portal vein thrombosisbillable I82Other venous embolism and thrombosis I83Varicose veins of lower extremities I85Esophageal varices I86Varicose veins of other sites I87Other disorders of veins I88Nonspecific lymphadenitis I89Other noninfective disorders of lymphatic vessels and lymph nodes

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

I80

Replacement codes

I80.3 — Phlebitis and thrombophlebitis of lower extremities, unspecifiedI80.8 — Phlebitis and thrombophlebitis of other sitesI80.9 — Phlebitis and thrombophlebitis of unspecified site

Common synonyms

Phlebitis and thrombophlebitis

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.