HCPCS Level II modifier
Modifier JW
Modifier JW is a HCPCS Level II modifier. CMS describes it as: Drug amount discarded/not administered to any patient.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- JW
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Drug amount discarded/not administered to any patient
- Claim form
- CMS-1500 item 24D, up to four modifiers per line. 837P SV101-3 to SV101-6.
- Guidance
- CMS HCPCS quarterly update
Drug waste and 340B
Related modifiers
- JZZero drug amount discarded/not administered to any patient
- JGDrug or biological acquired with 340b drug pricing program discount, reported for informational purposes
- TBDrug or biological acquired with 340b drug pricing program discount, reported for informational purposes
- JLThree month supply of drug or biological
- K0Lower extremity prosthesis functional level 0 - does not have the ability or potential to ambulate or transfer safely with or without assistance and a prosthesis does not enhance their quality of life or mobility.
- JKOne month supply or less of drug or biological
- K1Lower extremity prosthesis functional level 1 - has the ability or potential to use a prosthesis for transfers or ambulation on level surfaces at fixed cadence. typical of the limited and unlimited household ambulator.
- K2Lower extremity prosthesis functional level 2 - has the ability or potential for ambulation with the ability to traverse low level environmental barriers such as curbs, stairs or uneven surfaces. typical of the limited community ambulator.
Related pages
Questions
What does modifier JW mean?
Modifier JW is a HCPCS Level II modifier. CMS describes it as: Drug amount discarded/not administered to any patient.
Is modifier JW a CPT or a HCPCS modifier?
JW 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 JW 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.