TW HCPCS Level II modifier: Back-up equipment
TW is a HCPCS Level II modifier: “Back-up equipment.” It adds this detail to the code it is reported with.
Official description
TWBack-up equipment
HCPCS · United States
Medicare details
The indicators CMS publishes with TW in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Not payable by Medicare
- Added
- Jan 1, 2003
Where TW sits
- 1GroupHCPCS modifiers
- 2Modifier TWBack-up equipment
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 TW mean?
TW is the HCPCS code for “Back-up equipment” in CMS’s HCPCS Level II October 2026 release.
Where is TW in the HCPCS Level II list?
TW is listed under Modifiers.
Does Medicare cover TW?
CMS lists TW’s Medicare coverage as “Not payable by Medicare”. 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 TW
All modifiersTQBasic life support transport by a volunteer ambulance providerTRSchool-based individualized education program (iep) services provided outside the public school district responsible for the studentTSFollow-up serviceTTIndividualized service provided to more than one patient in same settingTUSpecial payment rate, overtimeTVSpecial payment rates, holidays/weekendsU1Medicaid level of care 1, as defined by each stateU2Medicaid level of care 2, as defined by each stateU3Medicaid level of care 3, as defined by each stateU4Medicaid level of care 4, as defined by each stateU5Medicaid level of care 5, as defined by each stateU6Medicaid level of care 6, as defined by each state