Transition to ICD-10: You won’t have to code external cause unless payer requires it, CMS clarifies

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Note:  The following article synopsis was NOT provided by HCPro. It was created by Find-A-Code/innoviHealth.

Article Overview

This article explains CMS guidance for the ICD-10 transition period, with emphasis on external cause reporting, when to code signs and symptoms, use of unspecified diagnoses, and how date of service affects whether ICD-9-CM or ICD-10-CM is used. It is relevant to coders, billers, compliance staff, and practices preparing systems and workflows for the ICD-10 implementation period.

Why This Topic Matters

It highlights transition-period coding and billing considerations that can affect claim accuracy, payer handling, and workflow readiness when moving from ICD-9-CM to ICD-10-CM.

What You Will Learn

  • How CMS framed external cause code reporting during the ICD-10 transition
  • When signs, symptoms, and unspecified diagnosis codes may be discussed in relation to diagnosis coding
  • How date of service affects the selection of ICD-9-CM versus ICD-10-CM
  • Why split claims may be needed when services span the transition date
  • What operational areas may need to be ready for dual-code-set processing

Who Should Read This

  • Medical coders
  • Billers
  • Coding auditors
  • Compliance staff
  • Revenue cycle teams
  • Provider practices
  • Health information management professionals

Codes Discussed

Code Ranges Discussed

  • ICD-10-CM: W59.22
  • ICD-10-CM: M25.53 SERIES

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