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ICD-10 Coding for Acute Limb Ischemia(I99.8)

Complete ICD-10-CM coding and documentation guide for Acute Limb Ischemia. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

ALIAcute Peripheral Arterial Occlusion

Related ICD-10 Code Ranges

Complete code families applicable to Acute Limb Ischemia

I99.8Primary Range

Other specified disorders of circulatory system

Primary code for acute limb ischemia, used for all cases regardless of etiology.

Embolism and thrombosis

Used to specify the underlying cause of acute limb ischemia when due to embolism or thrombosis.

Atherosclerosis of native arteries of extremities with rest pain

Used when acute limb ischemia is due to underlying peripheral artery disease with rest pain.

Key Information: ICD-10 code for acute limb ischemia

Essential facts and insights about Acute Limb Ischemia

The ICD-10 code for acute limb ischemia is I99.8, used for all cases regardless of etiology.

Primary ICD-10-CM Code for acute limb ischemia

Other specified disorders of circulatory system
Billable Code

Decision Criteria

clinical Criteria

  • Presence of acute symptoms and 6 Ps

coding Criteria

  • Use as primary code for all acute limb ischemia cases

Applicable To

  • Acute limb ischemia

Excludes

  • Chronic limb ischemia (I70.22)

Clinical Validation Requirements

  • Sudden onset of symptoms within 14 days
  • Presence of 6 Ps: Pain, Pallor, Pulselessness, Paralysis, Paresthesia, Poikilothermia
  • Ankle-brachial index (ABI) ≤0.4

Code-Specific Risks

  • Incorrectly using for chronic limb ischemia
  • Omitting etiology codes

Coding Notes

  • Always pair with etiology codes to specify the cause of ischemia.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Embolism and thrombosis of arteries of the lower extremities

I74.3
Use when acute limb ischemia is due to embolism.

Thrombosis of vein

I82.4B3
Use when acute limb ischemia is due to thrombosis.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Atherosclerosis of native arteries of extremities with rest pain

I70.22
Use for chronic limb ischemia with rest pain, not acute cases.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting Acute Limb Ischemia to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code I99.8.

Impact

Clinical: Incomplete clinical picture., Regulatory: Non-compliance with coding standards., Financial: Potential reimbursement issues.

Mitigation Strategy

Always review patient history for underlying causes.

Impact

Reimbursement: Incorrect DRG assignment leading to reimbursement issues., Compliance: Non-compliance with ICD-10 coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation Strategy

Always use I99.8 for acute limb ischemia and pair with etiology codes.

Impact

Failure to code underlying cause of ALI.

Mitigation Strategy

Implement thorough review of patient history and imaging.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for Acute Limb Ischemia, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for Acute Limb Ischemia

Use these documentation templates to ensure complete and accurate documentation for Acute Limb Ischemia. These templates include all required elements for proper coding and billing.

Emergency Department Note for ALI

Specialty: Emergency Medicine

Required Elements

  • Onset of symptoms
  • Presence of 6 Ps
  • Vascular examination findings
  • Imaging results

Example Documentation

62M with sudden-onset R leg pain, numbness, and inability to move toes ×3 hours. History of AFib on apixaban (noncompliant ×1 week). R femoral pulse absent. Doppler: No signal in dorsalis pedis. CTA shows abrupt occlusion of R superficial femoral artery with no collaterals.

Examples: Poor vs. Good Documentation

Poor Documentation Example
Leg pain and coldness.
Good Documentation Example
Acute onset of left lower extremity pain, pallor, and paralysis <6 hours ago. Absent femoral/popliteal pulses. ABI 0.3. CTA confirms popliteal artery occlusion.
Explanation
The good example provides comprehensive details on symptom onset, vascular findings, and imaging results, ensuring accurate coding.

Need help with ICD-10 coding for Acute Limb Ischemia? Ask your questions below.

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