HCPCS Level II modifier
Modifier TT
Modifier TT is a HCPCS Level II modifier. CMS describes it as: Individualized service provided to more than one patient in same setting.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- TT
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Individualized service provided to more than one patient in same setting
- Claim form
- CMS-1500 item 24D, up to four modifiers per line. 837P SV101-3 to SV101-6.
- Guidance
- CMS HCPCS quarterly update
Related modifiers
- TUSpecial payment rate, overtime
- TSFollow-up service
- TVSpecial payment rates, holidays/weekends
- TRSchool-based individualized education program (IEP) services provided outside the public school district responsible for the student
- TWBack-up equipment
- TQBasic life support transport by a volunteer ambulance provider
- U1Medicaid level of care 1, as defined by each state
- TPMedical transport, unloaded vehicle
Related pages
Questions
What does modifier TT mean?
Modifier TT is a HCPCS Level II modifier. CMS describes it as: Individualized service provided to more than one patient in same setting.
Is modifier TT a CPT or a HCPCS modifier?
TT is a HCPCS Level II modifier from the CMS quarterly HCPCS file. Two-digit numeric modifiers, such as 25 or 59, are CPT modifiers.
Where does modifier TT go on a claim?
On the CMS-1500 it goes in item 24D next to the procedure code. Each line holds up to four modifiers. On an 837P it goes in SV101-3 to SV101-6.
What denial comes back when a modifier is wrong?
A missing or mismatched modifier often comes back as CARC 4. A modifier that was not valid on the date of service comes back as CARC 182. A bundling edit the modifier should have bypassed comes back as CARC 97 or 236.