ICD10BillableValid for clinical use
ICD-10 Code I80.3: Phlebitis and thrombophlebitis of lower extremities, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 of lower extremities, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
Code hierarchy
chapter
9Diseases of the circulatory system (I00-I99)
block
I80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
category
I80Phlebitis and thrombophlebitis
currentI80
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
CardiologistGeneral Physician
Related codes
I80.0Phlebitis and thrombophlebitis of superficial vessels of lower extremitiescategoryI80.1Phlebitis and thrombophlebitis of femoral veincategoryI80.2Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremitiescategoryI80.8Phlebitis and thrombophlebitis of other sitescodeI80.9Phlebitis and thrombophlebitis of unspecified sitecode
Sibling codes
I80.0Phlebitis and thrombophlebitis of superficial vessels of lower extremitiesI80.1Phlebitis and thrombophlebitis of femoral veinI80.2Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremitiesI80.8Phlebitis and thrombophlebitis of other sitesbillableI80.9Phlebitis and thrombophlebitis of unspecified sitebillable
Coverage-related procedures and services
CPT 11720high
DEBRIDEMENT OF NAIL(S) BY ANY METHOD(S); 1 TO 5
Source: CMS coverage guidance
CPT 11721high
DEBRIDEMENT OF NAIL(S) BY ANY METHOD(S); 6 OR MORE
Source: CMS coverage guidance
CPT 93970high
DUPLEX SCAN OF EXTREMITY VEINS INCLUDING RESPONSES TO COMPRESSION AND OTHER MANEUVERS; COMPLETE BILATERAL STUDY
Source: CMS coverage guidance
CPT 93971high
DUPLEX SCAN OF EXTREMITY VEINS INCLUDING RESPONSES TO COMPRESSION AND OTHER MANEUVERS; UNILATERAL OR LIMITED STUDY
Source: CMS coverage guidance
HCPCS G0127high
TRIMMING OF DYSTROPHIC NAILS, ANY NUMBER
Source: CMS coverage guidance
CPT 11719high
TRIMMING OF NONDYSTROPHIC NAILS, ANY NUMBER
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 709597002high
Acute thrombosis of superficial vein of lower limb
Source: SNOMED International ICD-10 map
SNOMED_CT 16014311000119102high
Bilateral lower limb vein thrombophlebitis
Source: SNOMED International ICD-10 map
SNOMED_CT 16012311000119106high
Bilateral tibial vein thrombophlebitis
Source: SNOMED International ICD-10 map
SNOMED_CT 16014631000119103high
Left lower limb vein thrombophlebitis
Source: SNOMED International ICD-10 map
SNOMED_CT 312588002high
Phlebitis of lower limb vein
Source: SNOMED International ICD-10 map
SNOMED_CT 16014471000119103high
Right lower limb vein thrombophlebitis
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
I80.3
Common synonyms
Phlebitis and thrombophlebitis of lower extremities, unspecifiedPhlebitis and thrombophlebitis of lower extremities
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.