HCPCS Level II modifier
Modifier SW
Modifier SW is a HCPCS Level II modifier. CMS describes it as: Services provided by a certified diabetic educator.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- SW
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Services provided by a certified diabetic educator
- 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
- SYPersons who are in close contact with member of high-risk population (use only with codes for immunization)
- SVPharmaceuticals delivered to patient's home but not utilized
- SZHabilitative services
- SUProcedure performed in physician's office (to denote use of facility and equipment)
- T1Left foot, second digit
- STRelated to trauma or injury
- T2Left foot, third digit
- SSHome infusion services provided in the infusion suite of the IV therapy provider
Related pages
Questions
What does modifier SW mean?
Modifier SW is a HCPCS Level II modifier. CMS describes it as: Services provided by a certified diabetic educator.
Is modifier SW a CPT or a HCPCS modifier?
SW 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 SW 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.