What does ICD-10-CM code I63.9 mean?
I63.9 represents Cerebral infarction, unspecified. 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 CVA, Cerebrovascular accident in clinical documentation. Coders frequently reference this code as cva icd 10, icd 10 cva, cva icd 10 code, or icd code for cva.
This is classified as a critical acute condition that typically requires urgent evaluation and treatment. This diagnosis qualifies as a Major Complication or Comorbidity (MCC) under the MS-DRG system, which significantly impacts inpatient reimbursement.
Code category and hierarchy
- Chapter: 9 – Diseases of the Circulatory System (I00-I99)
- Category: I63
- Code: I63.9 – Cerebral infarction, unspecified
Guideline notes and coding considerations
Specificity Warning
I63.9 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: neonatal cerebral infarction ( P91.82 -)
- Use Additional Code: code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility ( Z92.82 ); code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score ( R29.7 -)
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 I63.9
- Query the provider for greater specificity if clinical details suggest a more precise code
- Use additional code: code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hou
- This code is an MCC — ensure documentation clearly supports the diagnosis severity
- This is a risk-adjusted diagnosis — ensure annual documentation with MEAT criteria (Monitor, Evaluate, Assess/Address, Treat)
When NOT to use I63.9
Do not assign I63.9 when the clinical scenario involves: neonatal cerebral infarction ( P91.82 -); when documentation provides enough detail for a more specific code. Review excludes notes and assign the most specific code supported by documentation.
Audit risk
I63.9 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 I63.9 Against ICD 10 CM Coding Guidelines
Check this code against official guidelines for conflicts and compliance issues.
Risk adjustment and HCC mapping
HCC Impact
I63.9 (Cerebral infarction, unspecified) maps to the following HCC categories: CMS-HCC V24: HCC 100, CMS-HCC V28: HCC 249, ESRD V24: HCC 100. 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 cva is I63.9, which represents cerebral infarction, unspecified. This code is also commonly referenced as icd 10 cva, cva icd 10 code, icd code for cva. Verify this code using the ICD Code Auditor to ensure guideline compliance.
Yes. I63.9 is an active ICD-10-CM diagnosis code used to classify cerebral infarction, unspecified for clinical documentation, reporting, and medical billing purposes.
Use the ICD Code Auditor to check I63.9 against official ICD-10-CM coding guidelines. The tool validates by fiscal year and patient gender to identify potential conflicts.
I63.9 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. I63.9 maps to HCC 100 in the CMS-HCC V24 model, and HCC 249 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 I63.9 (Cerebral infarction, unspecified). 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
Learn more about our Clinical Coding Review Process