HCPCS Level II modifier
Modifier PS
Modifier PS is a HCPCS Level II modifier. CMS describes it as: Positron emission tomography (PET) or PET/computed tomography (CT) to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treating physician determines that the PET study is needed to inform subsequent anti-tumor strategy.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
Run it in Rivvi
Check the codes on your claims export
Upload a claims export. Rivvi flags ICD-10 and HCPCS codes that are not billable or are replaced. It does not check modifiers.
Check my exportFree to start. Opens Rivvi, the AI workspace for healthcare teams.
- Modifier
- PS
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Positron emission tomography (PET) or PET/computed tomography (CT) to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treating physician determines that the PET study is needed to inform subsequent anti-tumor strategy
- 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
- PTColorectal cancer screening test; converted to diagnostic test or other procedure
- POExcepted service provided at an off-campus, outpatient, provider-based department of a hospital
- Q0Investigational clinical service provided in a clinical research study that is in an approved clinical research study
- PNNon-excepted service provided at an off-campus, outpatient, provider-based department of a hospital
- Q1Routine clinical service provided in a clinical research study that is in an approved clinical research study
- PMPost mortem
- Q2Demonstration procedure/service
- PLProgressive addition lenses
Related pages
Questions
What does modifier PS mean?
Modifier PS is a HCPCS Level II modifier. CMS describes it as: Positron emission tomography (PET) or PET/computed tomography (CT) to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treating physician determines that the PET study is needed to inform subsequent anti-tumor strategy.
Is modifier PS a CPT or a HCPCS modifier?
PS 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 PS 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.