What is ICD-10 code I82.519?

I82.519 is the ICD-10-CM diagnosis code for Chronic embolism and thrombosis of unspecified femoral vein. It belongs to the ICD-10-CM chapter for diseases of the circulatory system (i00-i99). I82.519 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I82.519 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. I82.519 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. I82.519 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for I82.519?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For I82.519, V28 maps to Vascular Disease at RAF 0.356 while V24 mapped to Vascular Disease at RAF 0.297. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting I82.519?

Verify whether the thrombosis is specifically left, right, or truly unspecified before assigning the 519 code; documentation should clearly indicate the side of the body affected Distinguish between acute thrombosis (I82.4-) and chronic thrombosis (I82.5-) as they have different code families; chronic implies the clot has been present for weeks or longer Because I82.519 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

I82.519 ICD-10 Code: Chronic embolism

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupI82.519Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89)

I82.519

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Chronic embolism and thrombosis of unspecified femoral vein

A blood clot that has formed in the femoral vein (the large vein in the thigh) and has persisted over time, potentially blocking blood flow in the leg. This is a chronic condition where the clot is not recent but has been present for an extended period.

Buddy Insight

Chronic femoral vein thrombosis is a major proximal deep vein thrombosis that indicates a long-standing clot in one of the principal deep veins of the thigh.

CMS-HCC V28

Mapped

HCC 267

Vascular Disease

RAF 0.356

CMS-HCC V24

Mapped

HCC 108

Vascular Disease

RAF 0.297

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 108

Vascular Disease

RAF 0.0

RXHCC

Mapped

HCC 215

Pulmonary Embolism and Other ...

RAF 0.0

Code Trumping

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Code Book Path

Official

I82.5Chronic embolism and thrombosis of deep veins of lower extremity

I82.51Chronic embolism and thrombosis of femoral vein

I82.519Chronic embolism and thrombosis of unspecified femoral vein

Inclusion Terms

Official

Chronic embolism and thrombosis of common femoral vein
Chronic embolism and thrombosis of deep femoral vein

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I82.519 in this effective period.

Related Child Codes

Official

I82.511Chronic embolism and thrombosis of right femoral vein

I82.512Chronic embolism and thrombosis of left femoral vein

I82.513Chronic embolism and thrombosis of femoral vein, bilateral

Includes

Official

ICD-10-CM does not list Includes notes for I82.519 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I82.519 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I82.519 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I82.519 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for I82.519 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

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., femoral)

Query provider for laterality (right, left, or bilateral) when not documented

MEAT Support

HCC Buddy guidance

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., femoral)

Query provider for laterality (right, left, or bilateral) when not documented

Audit Caution

HCC Buddy guidance

Confusing acute and chronic deep vein thrombosis — these have different code families (I82.4- for acute lower extremity, I82.5- for chronic lower extremity) and the provider must explicitly document 'chronic'

Defaulting to 'unspecified' laterality without querying the provider; always review imaging reports and clinical notes for laterality before accepting an unspecified code

Coding to an unspecified deep vein when the femoral vein is clearly documented — always review imaging and clinical notes for the specific vein involved

Assuming deep vein thrombosis is chronic solely because the patient has been on anticoagulation for a long time; the provider must explicitly document the condition as chronic

Common Mistakes

HCC Buddy guidance

I82.419 — Acute embolism and thrombosis of femoral vein; ensure documentation explicitly states chronic status

I82.50- — Chronic embolism and thrombosis of unspecified deep veins; use the femoral-specific code when the femoral vein is documented

I82.52- — Chronic embolism and thrombosis of iliac vein; the iliac vein is more proximal than the femoral; verify exact vein documented

I87.01- — Postthrombotic syndrome; code separately if post-thrombotic sequelae are present alongside chronic deep vein thrombosis

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is I82.519 an HCC code?

Yes. I82.519 maps to Vascular Disease under the CMS-HCC V28 risk adjustment model (and Vascular Disease under V24).

HCC Category Mapping

V28HCC 267, Vascular Disease

0.356

V24HCC 108, Vascular Disease

0.297

ESRDHCC 108, Vascular Disease

0.000

RxHCCHCC 215, Pulmonary Embolism and Other Vascular Disease

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

MEAT Criteria for I82.519

For I82.519to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed I82.519 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

I82.519 is the ICD-10-CM diagnosis code for chronic embolism and thrombosis of unspecified femoral vein. A blood clot that has formed in the femoral vein (the large vein in the thigh) and has persisted over time, potentially blocking blood flow in the leg. This is a chronic condition where the clot is not recent but has been present for an extended period. I82.519 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (i80-i89).

Under the CMS-HCC V28 risk adjustment model, I82.519 maps to Vascular Disease (HCC 267) with a community, non-dual, aged base RAF weight of 0.356. Under the older V24 model, I82.519 mapped to the same category but with a base RAF weight of 0.297, V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Verify whether the thrombosis is specifically left, right, or truly unspecified before assigning the 519 code; documentation should clearly indicate the side of the body affected. Because I82.519 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I82.519 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify whether the thrombosis is specifically left, right, or truly unspecified before assigning the 519 code; documentation should clearly indicate the side of the body affected
•Distinguish between acute thrombosis (I82.4-) and chronic thrombosis (I82.5-) as they have different code families; chronic implies the clot has been present for weeks or longer

Clinical Significance

Chronic femoral vein thrombosis is a major proximal deep vein thrombosis that indicates a long-standing clot in one of the principal deep veins of the thigh. This condition significantly increases the risk of post-thrombotic syndrome with chronic leg swelling, pain, and skin changes, and requires ongoing anticoagulation therapy. Femoral vein involvement is a key indicator of substantial vascular disease burden for risk adjustment purposes.

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., femoral)
✓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

•I82.419: Acute embolism and thrombosis of femoral vein; ensure documentation explicitly states chronic status
•I82.50-: Chronic embolism and thrombosis of unspecified deep veins; use the femoral-specific code when the femoral vein is documented
•I82.52-: Chronic embolism and thrombosis of iliac vein; the iliac vein is more proximal than the femoral; verify exact vein documented
•I87.01-: Postthrombotic syndrome; code separately if post-thrombotic sequelae are present alongside chronic deep vein thrombosis