I82.559 ICD-10-CM Code: Chronic embolism and thrombosis of unspecified peroneal vein

Code

I82.559

Description

Chronic embolism and thrombosis of unspecified peroneal vein

HCC (V28)

HCC 267 — Deep Vein Thrombosis and Pulmonary Embolism

RAF reference coefficient

0.294

Billable

Yes

Payment year

2026

HCC Category Mapping

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work I82.559 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for I82.559

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I82.559 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •Verify documentation specifies 'chronic' status and peroneal vein location before assigning this code
• •If laterality (left/right) is documented, use more specific codes I82.551 or I82.552 instead

Clinical Significance

Chronic peroneal (fibular) vein thrombosis is a distal deep vein thrombosis that indicates a persistent clot in one of the paired veins running alongside the fibula. While peroneal vein thrombosis is a distal deep vein thrombosis, it can propagate to the popliteal vein and cause clinically significant post-thrombotic changes. Capturing this diagnosis accurately supports appropriate risk adjustment and reflects the patient's ongoing vascular disease management needs.

Documentation Requirements

• ✓Provider documentation explicitly stating 'chronic' deep vein thrombosis (not assumed from duration of treatment)
• ✓Clinical evidence supporting the diagnosis such as duplex ultrasound, venography, or other imaging results
• ✓Specific vein location documented (e.g., peroneal)
• ✓Query provider for laterality (right, left, or bilateral) when not documented
• ✓Current treatment plan including anticoagulation therapy and duration
• ✓Assessment and monitoring notes demonstrating the condition is being actively managed
• ✓Documentation of chronicity such as 'chronic,' 'old,' 'long-standing,' or history of prior acute deep vein thrombosis that has transitioned to chronic status

Commonly Confused Codes

• •I82.459: Acute embolism and thrombosis of peroneal vein; ensure documentation supports chronic rather than acute
• •I82.54-: Chronic embolism and thrombosis of tibial vein; the tibial and peroneal veins are separate paired calf veins
• •I82.56-: Chronic embolism and thrombosis of calf muscular vein; calf muscular veins (soleal, gastrocnemius) are distinct from the peroneal vein
• •I82.5Z-: Chronic embolism of unspecified deep veins of distal lower extremity; use peroneal-specific code when documentation specifies the peroneal vein

Child Codes