What is ICD-10 code I82.B11?

I82.B11 is the ICD-10-CM diagnosis code for Acute embolism and thrombosis of right subclavian vein. A sudden blood clot that has formed in the right subclavian vein (a major vein near the collarbone), potentially causing acute obstruction. I82.B11 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I82.B11 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.B11 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.B11 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.B11 map to under V28?

I82.B11 maps to CMS-HCC V28 HCC 267 (Deep Vein Thrombosis and Pulmonary Embolism). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

What documentation supports I82.B11?

Verify documentation confirms 'acute' status and right-sided location to distinguish from chronic presentations Ensure the condition is documented as affecting the subclavian vein, not the axillary or other upper extremity vessels Because I82.B11 maps to an HCC category, the documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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.B11: Acute embolism

I82.B11 maps to CMS-HCC V28 267. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupI82.B11Effective 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.B11

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

Acute embolism and thrombosis of right subclavian vein

A sudden blood clot that has formed in the right subclavian vein (a major vein near the collarbone), potentially causing acute obstruction.

Buddy Insight

Acute subclavian vein thrombosis represents a significant vascular event that can lead to pulmonary embolism, post-thrombotic syndrome, and recurrent venous thromboembolism.

CMS-HCC V28

Mapped

HCC 267

Deep Vein Thrombosis and Pulm...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 156

HHS-HCC 156 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 108

Vascular Disease

Code-level coefficient reference

RXHCC

Mapped

HCC 215

Venous Thromboembolism

Code-level coefficient reference

Code Book Path

Official

I82.BEmbolism and thrombosis of subclavian vein

I82.B1Acute embolism and thrombosis of subclavian vein

I82.B11Acute embolism and thrombosis of right subclavian vein

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for I82.B11 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I82.B11 in this effective period.

Related Child Codes

Official

I82.B12Acute embolism and thrombosis of left subclavian vein

I82.B13Acute embolism and thrombosis of subclavian vein, bilateral

I82.B19Acute embolism and thrombosis of unspecified subclavian vein

Includes

Official

ICD-10-CM does not list Includes notes for I82.B11 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for I82.B11 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for I82.B11 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I82.B11 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for I82.B11 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation explicitly stating acute embolism or thrombosis of the subclavian vein

Laterality must be documented (right side) — 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 acute embolism or thrombosis of the subclavian vein

Laterality must be documented (right side) — 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 acute when the documentation actually supports chronic presentation — always verify the acuity from the clinical note

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

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

Not updating the code from acute to chronic on subsequent encounters when the thrombosis has evolved past the acute phase

Common Mistakes

HCC Buddy guidance

I82.B21 — Chronic (not acute) embolism and thrombosis of the right subclavian vein; use when the clot is long-standing

I82.A11 — Acute embolism and thrombosis of the right axillary vein; different vessel, more distal in the arm

I82.C11 — Acute embolism and thrombosis of the right internal jugular vein; different vessel in the neck

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.B11 an HCC code?

Yes. I82.B11 (Acute embolism and thrombosis of right subclavian vein) maps to HCC 267, Deep Vein Thrombosis and Pulmonary Embolism under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.294. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: I82.B11 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.B11
Description: Acute embolism and thrombosis of right subclavian vein
HCC (V28): HCC 267 — Deep Vein Thrombosis and Pulmonary Embolism
RAF reference coefficient: 0.294
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 267, Deep Vein Thrombosis and Pulmonary Embolism

0.294

ESRDHCC 108, Vascular Disease

Not separately weighted

RxHCCHCC 215, Venous Thromboembolism

Not separately weighted

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.B11 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for I82.B11

For I82.B11 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.B11 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I82.B11 is the ICD-10-CM diagnosis code for acute embolism and thrombosis of right subclavian vein. A sudden blood clot that has formed in the right subclavian vein (a major vein near the collarbone), potentially causing acute obstruction. I82.B11 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.B11 maps to Deep Vein Thrombosis and Pulmonary Embolism (HCC 267) with a source-labeled community, non-dual, aged reference coefficient of 0.294. No V24 mapping is shown for I82.B11; use the applicable model and payment year when reviewing the V28 mapping. 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. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Verify documentation confirms 'acute' status and right-sided location to distinguish from chronic presentations. Because I82.B11 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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, source-labeled coefficient references, and MEAT documentation criteria for I82.B11 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify documentation confirms 'acute' status and right-sided location to distinguish from chronic presentations
•Ensure the condition is documented as affecting the subclavian vein, not the axillary or other upper extremity vessels

Clinical Significance

Acute subclavian vein thrombosis represents a significant vascular event that can lead to pulmonary embolism, post-thrombotic syndrome, and recurrent venous thromboembolism. This diagnosis is critical for risk adjustment as it reflects active vascular disease requiring anticoagulation therapy, monitoring, and potentially invasive interventions. Accurate capture ensures appropriate resource allocation for ongoing management and complication prevention.

Documentation Requirements

✓Provider documentation explicitly stating acute embolism or thrombosis of the subclavian vein
✓Laterality must be documented (right side) — 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
✓Date of onset or timeframe establishing the acute nature of the condition
✓Any precipitating factors (central line placement, surgery, malignancy, hypercoagulable state)

Commonly Confused Codes

•I82.B21: Chronic (not acute) embolism and thrombosis of the right subclavian vein; use when the clot is long-standing
•I82.A11: Acute embolism and thrombosis of the right axillary vein; different vessel, more distal in the arm
•I82.C11: Acute embolism and thrombosis of the right internal jugular vein; different vessel in the neck