AT HCPCS Level II modifier: Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)
AT is a HCPCS Level II modifier: “Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942).” It adds this detail to the code it is reported with.
Official description
ATAcute treatment (this modifier should be used when reporting service 98940, 98941, 98942)
Short description: Acute treatment
HCPCS · United States
Medicare details
The indicators CMS publishes with AT in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 1984
Where AT sits
- 1GroupHCPCS modifiers
- 2Modifier ATAcute treatment (this modifier should be used when reporting service 98940, 98941, 98942)
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 AT mean?
AT is the HCPCS code for “Acute treatment (this modifier should be used when reporting service 98940, 98941, 98942)” in CMS’s HCPCS Level II October 2026 release.
Where is AT in the HCPCS Level II list?
AT is listed under Modifiers.
Does Medicare cover AT?
CMS lists AT’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.
Codes beside AT
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