I63.239 Billable Code FY2027 Status: Active

I63.239: Cereb infrc due to unsp occls or stenos of unsp crtd artery

Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid artery

Effective Date: 2026-10-01
Dataset: ICD-10-CM FY2027
Source: Centers for Disease Control and Prevention (CDC)
Last Verified: 2026-10-01
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Quick Clinical & Billing Summary

What is ICD-10-CM code I63.239? I63.239 represents Cereb infrc due to unsp occls or stenos of unsp crtd artery. Under official CDC guidelines, this code is billable and specific for claim submission.

Current release: FY2027 (Effective October 1, 2026). Sourced directly from CDC NCHS files.

Code Hierarchy & Classification

⌊ Category I63: Cerebral infarction
⌊ I63.239: Cereb infrc due to unsp occls or stenos of unsp crtd artery (Current Code)

Clinical Guidance & Documentation Standards

Clinical documentation should substantiate the medical necessity of this diagnosis, including laterality, anatomical site specificity, and clinical severity.
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CMS-HCC Risk Adjustment Model

CMS-HCC 249 (Cerebrovascular Disease)

Diagnoses under category I63 map to the official CMS-HCC (Hierarchical Condition Category) risk adjustment model used for Medicare Advantage risk scoring.

Clinical Documentation Requirement: Annual re-documentation is mandatory. Medical record must demonstrate evaluation, monitoring, management, or treatment during the encounter to support Risk Adjustment Factor (RAF) scoring.

Associated Procedures & Medicare RVU Reimbursement

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Typical outpatient and office evaluation procedures frequently billed alongside diagnosis I63.239:

CPT/HCPCS Description Work RVU Non-Facility Fee Facility Fee
99213 Office/outpatient visit, established patient, 20-29 minutes (Low MDM) 1.30 $91.69 $66.79
99214 Office/outpatient visit, established patient, 30-39 minutes (Moderate MDM) 1.92 $133.61 $100.21
96372 Therapeutic, prophylactic, or diagnostic injection (subcutaneous/intramuscular) 0.17 $18.34 $12.44
Based on official CMS 2026 Physician Fee Schedule conversion factor ($32.7476). Payments vary by locality GPCI.

CPT Modifier & Billing Rules

Modifier 25 Significant E/M

Append when a significant, separately identifiable evaluation and management service is provided on the same calendar day as a minor surgical procedure or injection.

Modifier 59 Distinct Service

Identifies procedures or services not normally reported together but distinct under the clinical circumstances. Use CMS X-modifiers (XE, XS, XP, XU) where required by Medicare.

Check NCCI Procedure to Procedure (PTP) unbundling rules in NCCI Checker →

Frequently Asked Questions about I63.239

Is I63.239 a billable ICD-10 code?

Yes, I63.239 is a valid, billable and specific ICD-10-CM code. It can be reported as a primary or secondary diagnosis on medical claims.

What is the ICD-10 code for Cereb infrc due to unsp occls or stenos of unsp crtd artery?

The primary ICD-10-CM code for Cereb infrc due to unsp occls or stenos of unsp crtd artery is I63.239.

What is the effective date of the current I63.239 code?

The code is active for fiscal year FY2027, effective starting 2026-10-01.

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Official Provenance: Sourced from CDC / NCHS FY2027 ICD-10-CM files. Report a Data Error
Verified: 2026-10-01