Reader Questions: Maximize CS Modifier Use

Why This Topic Matters

Accurate use of modifier CS on eligible Part B claims was tied to pandemic-era Medicare policy, so staying current on the codes CMS accepts helped reduce claim denials and support compliant billing.

Article Sections

1. Question

   A reader asks which services are appropriate for use with modifier CS during the public health emergency.

2. Answer

   The response summarizes CMS’s updated list of acceptable codes and notes the policy context for Medicare claims during the emergency period.

3. Backtrack

   This section reviews the earlier FFCRA and CMS policy background that led to modifier CS requirements for certain Part B services during the public health emergency.

4. HCPCS codes:

   This section identifies newly accepted HCPCS codes associated with the CMS update for the relevant reporting period.

5. CPT® codes:

   This section identifies CPT codes included in the updated CMS guidance and notes the timing of their acceptance.