What does ICD-10-CM code I82.409 mean?
I82.409 represents Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity. This cardiovascular condition is classified under Chapter 9 (Diseases of the Circulatory System) and is one of the most commonly coded circulatory system diagnoses. This condition is commonly abbreviated as DVT, Deep-vein thrombosis in clinical documentation. Coders frequently reference this code as deep vein thrombosis icd 10, deep vein thrombosis icd 10 code, deep vein thrombosis unspecified icd 10, or acute deep vein thrombosis icd 10.
This is classified as a critical acute condition that typically requires urgent evaluation and treatment.
Code category and hierarchy
- Chapter: 9 – Diseases of the Circulatory System (I00-I99)
- Category: I82
- Code: I82.409 – Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity
Guideline notes and coding considerations
Specificity Warning
I82.409 is an unspecified code. Query the provider for greater specificity when documentation suggests a more precise code is available. Using unspecified codes when specific codes exist may trigger audits.
- Excludes1: acute embolism and thrombosis of unspecified deep veins of distal lower extremity ( I82.4Z -); acute embolism and thrombosis of unspecified deep veins of proximal lower extremity ( I82.4Y -)
- Code First: venous embolism and thrombosis complicating:; abortion, ectopic or molar pregnancy ( O00 - O07 , O08.7 ); pregnancy, childbirth and the puerperium ( O22 .-, O87 .-)
Learn the underlying rules in the ICD-10 Coding Guidelines, Combination Code Requirements, Risk Adjustment & MEAT Documentation.
Documentation tips (what coders should confirm)
- Verify the clinical documentation supports the use of I82.409
- Query the provider for greater specificity if clinical details suggest a more precise code
- Code first: venous embolism and thrombosis complicating: | abortion, ectopic or molar pregnancy ( O00 - O07 , O08.7 ) | pregnancy, c
- This is a risk-adjusted diagnosis — ensure annual documentation with MEAT criteria (Monitor, Evaluate, Assess/Address, Treat)
When NOT to use I82.409
Do not assign I82.409 when the clinical scenario involves: acute embolism and thrombosis of unspecified deep veins of distal lower extremity ( I82.4Z -); acute embolism and thrombosis of unspecified deep veins of proximal lower extremity ( I82.4Y -); when documentation provides enough detail for a more specific code. Review excludes notes and assign the most specific code supported by documentation.
Audit risk
I82.409 is an unspecified code. Payers and auditors may flag claims with unspecified codes when the medical record contains sufficient detail for a more precise diagnosis. Query the provider for specificity before submitting.
Validate I82.409 Against ICD 10 CM Coding Guidelines
Check this code against official guidelines for conflicts and compliance issues.
Risk adjustment and HCC mapping
HCC Impact
I82.409 (Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity) maps to the following HCC categories: CMS-HCC V24: HCC 108, CMS-HCC V28: HCC 267, RxHCC V08: HCC 215, ESRD V24: HCC 108. Proper documentation using MEAT criteria (Monitor, Evaluate, Assess/Address, Treat) is required for each encounter to support risk-adjusted diagnoses.
Learn more about risk adjustment documentation in our Risk Adjustment & MEAT Documentation Guide.
Related ICD-10 codes
Frequently Asked Questions
The ICD-10-CM code for deep vein thrombosis is I82.409, which represents acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity. This code is also commonly referenced as deep vein thrombosis icd 10 code, deep vein thrombosis unspecified icd 10, acute deep vein thrombosis icd 10. Verify this code using the ICD Code Auditor to ensure guideline compliance.
Yes. I82.409 is an active ICD-10-CM diagnosis code used to classify acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity for clinical documentation, reporting, and medical billing purposes.
Use the ICD Code Auditor to check I82.409 against official ICD-10-CM coding guidelines. The tool validates by fiscal year and patient gender to identify potential conflicts.
I82.409 should be used only when clinical documentation does not provide enough detail for a more specific code. Always query the provider when documentation suggests greater specificity is available, as unspecified codes may trigger audits and impact risk adjustment.
Yes. I82.409 maps to HCC 108 in the CMS-HCC V24 model, and HCC 267 in V28. Accurate coding of this condition directly impacts RAF scores for Medicare Advantage plans. Ensure documentation demonstrates the condition was evaluated and managed during the encounter.
Documentation should clearly describe the clinical condition represented by I82.409 (Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity). Include relevant clinical findings, diagnostic test results, provider assessment, and the treatment plan. The diagnosis must be supported by the medical record and not based solely on lab results without clinical interpretation.
Sources
Reviewed by: Certified ICD-10 Coding & Risk Adjustment Specialist
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