A4 HCPCS Level II modifier: Dressing for four wounds
A4 is a HCPCS Level II modifier: “Dressing for four wounds.” It adds this detail to the code it is reported with.
Official description
A4Dressing for four wounds
HCPCS · United States
Medicare details
The indicators CMS publishes with A4 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jul 1, 2002
Where A4 sits
- 1GroupHCPCS modifiers
- 2Modifier A4Dressing for four wounds
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code A4 mean?
A4 is the HCPCS code for “Dressing for four wounds” in CMS’s HCPCS Level II October 2026 release.
Where is A4 in the HCPCS Level II list?
A4 is listed under Modifiers.
Does Medicare cover A4?
CMS lists A4’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.