HCPCS Level II modifier
Modifier FS
Modifier FS is a HCPCS Level II modifier. CMS describes it as: Split (or shared) evaluation and management visit.
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
- FS
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Split (or shared) evaluation and management visit
- 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
- FTUnrelated evaluation and management (E/M) visit on the same day as another E/M visit or during a global procedure (preoperative, postoperative period, or on the same day as the procedure, as applicable). (report when an E/M visit is furnished within the global period but is unrelated, or when one or more additional E/M visits furnished on the same day are unrelated)
- FRThe supervising practitioner was present through two-way, audio/video communication technology
- FXX-ray taken using film
- FQThe service was furnished using audio-only communication technology
- FYX-ray taken using computed radiography technology/cassette-based imaging
- FPService provided as part of family planning program
- G0Telehealth services for diagnosis, evaluation, or treatment, of symptoms of an acute stroke
- FCPartial credit received for replaced device
Related pages
Questions
What does modifier FS mean?
Modifier FS is a HCPCS Level II modifier. CMS describes it as: Split (or shared) evaluation and management visit.
Is modifier FS a CPT or a HCPCS modifier?
FS 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 FS 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.