Use of modifier(s)

Clarification is needed regarding whether it is appropriate to append a modifier to an unlisted CPT code. There are several CPT Assistants archives, which state that it is inappropriate because the unlisted code does not include descriptor language that specifies a specific service and/or procedure. However, some Q & A’s published in AHA’s Coding Clinic for HCPCS newsletter advise to append modifiers to some unlisted codes to identify laterality such as RT, Right side. Is it correct to append modifiers to unlisted CPT codes? ...

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

Article Overview

This article discusses when modifiers may be considered in connection with unlisted CPT procedures, with attention to the role of laterality and body-site specificity. It is written for coding professionals seeking clarification on how general modifier guidance is discussed across coding references and why unlisted procedure reporting can raise questions.

Why This Topic Matters

Understanding this topic helps coders and auditors recognize when modifier guidance is being discussed for unlisted procedures and when additional review of source guidance may be needed. It is relevant for accurate claim reporting, coding education, and interpretation of published coding commentary.

Article Sections

  1. Overview of modifier use

    Introduces the general purpose of modifiers and how they relate to procedure and service reporting.

  2. Unlisted CPT procedures and modifier guidance

    Summarizes the discussion of modifiers in connection with unlisted CPT services and references to published coding guidance.

  3. Question and answer discussion

    Presents a short Q&A format addressing the appropriateness of modifiers for selected unlisted procedure scenarios.

What You Will Learn

  • The general role of modifiers in procedure reporting
  • Why unlisted CPT procedures can raise modifier questions
  • How published coding commentary is discussed in relation to modifier use
  • The types of scenarios that prompt clarification on laterality and body-site specificity

Who Should Read This

  • Medical coders
  • Coding auditors
  • Coding educators
  • Revenue cycle staff
  • Compliance professionals

Codes Discussed

Modifiers Discussed


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The AHA Coding Clinic for HCPCS includes:

  • The official publication for Level I HCPCS (CPT-4 codes) for hospital providers
  • Also specific Level II HCPCS codes for hospitals, physicians and other health professionals
  • Current newsletters added each quarter
  • Full Archives back to 2001
  • Fully searchable through Find-A-Code's Comprehensive Search
  • Codes mentioned in articles are linked to Code Information pages
  • Code Information page link back to related articles
  • View all the articles associated with any code, right from the code page!
Access to this feature is available in the following products:
  • AHA's Coding Clinic® - HCPCS +Archives

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