What is ICD-10 code I82.C23?

I82.C23 is the ICD-10-CM diagnosis code for Chronic embolism and thrombosis of internal jugular vein, bilateral. It belongs to the ICD-10-CM chapter for diseases of the circulatory system (i00-i99). I82.C23 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I82.C23 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.C23 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.C23 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.

Which HCC does I82.C23 map to under V28?

I82.C23 maps to CMS-HCC V28 267 (Deep Vein Thrombosis and Pulmonary Embolism). The category number and label come from the CMS-HCC V28 model file for payment year 2026.

What does I82.C23 pay in RAF?

I82.C23 carries a community, non-dual, aged (CNA) RAF weight of 0.294 under CMS-HCC V28 for payment year 2026. The weight comes from the CMS V28 relative-factor file, not a hand-typed table.

What is the V28 vs V24 difference for I82.C23?

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.C23, V28 maps to Deep Vein Thrombosis and Pulmonary Embolism at RAF 0.294 while V24 mapped to Vascular Disease at RAF 0.288. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports I82.C23?

Verify documentation specifies 'bilateral' involvement of both internal jugular veins before assigning this code; unilateral cases use different codes (I82.C11 or I82.C12) Confirm the thrombosis is chronic (long-standing) rather than acute; acute cases are coded separately under I82.A23 Because I82.C23 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. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM I82.C23: Chronic embolism

I82.C23 maps to CMS-HCC V28 267 (RAF 0.294). Documentation must support MEAT. MEAT criteria · RAF calculator · HCC Buddy coding tools

ICD-10-CM Code View

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Code lookupI82.C23Effective 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.C23

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

Chronic embolism and thrombosis of internal jugular vein, bilateral

A blood clot that has formed in both of the internal jugular veins (the large veins in the neck that return blood from the head) and has persisted over time. This condition restricts blood flow from the head back to the heart on both sides of the neck.

Buddy Insight

CMS-HCC V28

Mapped

HCC 267

Deep Vein Thrombosis and Pulm...

RAF 0.294

CMS-HCC V24

Mapped

HCC 108

Vascular Disease

RAF 0.288

ACA/HHS

Mapped

HCC 156

HHS-HCC 156

Varies by metal level

ESRD/PACE

Mapped

HCC 108

Vascular Disease

RAF 0.073

RXHCC

Mapped

HCC 215

Pulmonary Embolism and Other ...

RAF 0.228

Code Book Path

Official

I82.CEmbolism and thrombosis of internal jugular vein

I82.C2Chronic embolism and thrombosis of internal jugular vein

I82.C23Chronic embolism and thrombosis of internal jugular vein, bilateral

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for I82.C23 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I82.C23 in this effective period.

Related Child Codes

Official

I82.C21Chronic embolism and thrombosis of right internal jugular vein

I82.C22Chronic embolism and thrombosis of left internal jugular vein

I82.C29Chronic embolism and thrombosis of unspecified internal jugular vein

Includes

Official

ICD-10-CM does not list Includes notes for I82.C23 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I82.C23 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I82.C23 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I82.C23 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for I82.C23 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation explicitly stating chronic embolism or thrombosis of the internal jugular vein

Laterality must be documented (bilateral) — do not assume from context

Clinical findings supporting the diagnosis (e.g., swelling, pain, imaging results such as duplex ultrasound or CT venography)

Current treatment plan including anticoagulation therapy type, duration, and monitoring parameters

MEAT Support

HCC Buddy guidance

Provider documentation explicitly stating chronic embolism or thrombosis of the internal jugular vein

Laterality must be documented (bilateral) — do not assume from context

Clinical findings supporting the diagnosis (e.g., swelling, pain, imaging results such as duplex ultrasound or CT venography)

Current treatment plan including anticoagulation therapy type, duration, and monitoring parameters

Audit Caution

HCC Buddy guidance

Coding chronic when the documentation actually supports acute presentation — always verify the acuity from the clinical note

Confusing the internal jugular vein with adjacent veins (e.g., subclavian) — verify the exact vessel documented

Failing to code the underlying etiology when documented (e.g., malignancy, central venous catheter, thoracic outlet syndrome)

Reporting a resolved thrombosis as chronic when the provider documents it is no longer present — chronic implies the clot is still there

Common Mistakes

HCC Buddy guidance

I82.C13 — Acute (not chronic) embolism and thrombosis of the bilateral internal jugular vein; use for newly formed clots

I82.B23 — Chronic embolism and thrombosis of the bilateral subclavian vein; different vessel near the collarbone

I80.8 — Phlebitis and thrombophlebitis of other sites; inflammatory component distinguishes this from pure thrombosis

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is I82.C23 an HCC code?

Yes. I82.C23 (Chronic embolism and thrombosis of internal jugular vein, bilateral) maps to Deep Vein Thrombosis and Pulmonary Embolism under the CMS-HCC V28 risk adjustment model (and Vascular Disease under V24), with a community non-dual aged RAF of 0.294. It is billable for payment year 2026.

Coder answer: I82.C23 is billable and maps to V28 HCC 267, Deep Vein Thrombosis and Pulmonary Embolism. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: I82.C23
Description: Chronic embolism and thrombosis of internal jugular vein, bilateral
HCC (V28): HCC 267 — Deep Vein Thrombosis and Pulmonary Embolism
RAF: 0.294
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 267, Deep Vein Thrombosis and Pulmonary Embolism

0.294

V24HCC 108, Vascular Disease

0.288

ESRDHCC 108, Vascular Disease

0.073

RxHCCHCC 215, Pulmonary Embolism and Other Vascular Disease

0.228

Each model's RAF is its CMS base weight for that model's standard population, so 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 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.

Work I82.C23 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for I82.C23

For I82.C23 to 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.C23 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I82.C23 is the ICD-10-CM diagnosis code for chronic embolism and thrombosis of internal jugular vein, bilateral. A blood clot that has formed in both of the internal jugular veins (the large veins in the neck that return blood from the head) and has persisted over time. This condition restricts blood flow from the head back to the heart on both sides of the neck. I82.C23 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.C23 maps to Deep Vein Thrombosis and Pulmonary Embolism (HCC 267) with a community, non-dual, aged base RAF weight of 0.294. Under the older CMS-HCC V24 model, I82.C23 maps to Vascular Disease (HCC 108) with a community, non-dual, aged base RAF weight of 0.288. 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 documentation specifies 'bilateral' involvement of both internal jugular veins before assigning this code; unilateral cases use different codes (I82.C11 or I82.C12). Because I82.C23 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.C23 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify documentation specifies 'bilateral' involvement of both internal jugular veins before assigning this code; unilateral cases use different codes (I82.C11 or I82.C12)
•Confirm the thrombosis is chronic (long-standing) rather than acute; acute cases are coded separately under I82.A23

Clinical Significance

Chronic internal jugular vein thrombosis indicates a long-standing vascular condition with persistent clot burden, reflecting ongoing risk for post-thrombotic syndrome, recurrent thromboembolism, and venous insufficiency. This diagnosis captures the sustained complexity of the patient's vascular disease and the need for long-term anticoagulation management, which is important for accurate risk adjustment.

Documentation Requirements

✓Provider documentation explicitly stating chronic embolism or thrombosis of the internal jugular vein
✓Laterality must be documented (bilateral) — do not assume from context
✓Clinical findings supporting the diagnosis (e.g., swelling, pain, imaging results such as duplex ultrasound or CT venography)
✓Current treatment plan including anticoagulation therapy type, duration, and monitoring parameters
✓Duration or timeline establishing chronicity (e.g., 'long-standing,' 'diagnosed 6 months ago')
✓Evidence of ongoing monitoring or follow-up imaging confirming persistent thrombus

Commonly Confused Codes

•I82.C13: Acute (not chronic) embolism and thrombosis of the bilateral internal jugular vein; use for newly formed clots
•I82.B23: Chronic embolism and thrombosis of the bilateral subclavian vein; different vessel near the collarbone
•I80.8: Phlebitis and thrombophlebitis of other sites; inflammatory component distinguishes this from pure thrombosis