HCPCS Level II modifier
Modifier FB
Modifier FB is a HCPCS Level II modifier. CMS describes it as: Item provided without cost to provider, supplier or practitioner, or full credit received for replaced device (examples, but not limited to, covered under warranty, replaced due to defect, free samples).
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- FB
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Item provided without cost to provider, supplier or practitioner, or full credit received for replaced device (examples, but not limited to, covered under warranty, replaced due to defect, free samples)
- 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
- FCPartial credit received for replaced device
- FALeft hand, thumb
- FPService provided as part of family planning program
- F9Right hand, fifth digit
- FQThe service was furnished using audio-only communication technology
- F8Right hand, fourth digit
- FRThe supervising practitioner was present through two-way, audio/video communication technology
- F7Right hand, third digit
Related pages
Questions
What does modifier FB mean?
Modifier FB is a HCPCS Level II modifier. CMS describes it as: Item provided without cost to provider, supplier or practitioner, or full credit received for replaced device (examples, but not limited to, covered under warranty, replaced due to defect, free samples).
Is modifier FB a CPT or a HCPCS modifier?
FB 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 FB 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.