KO HCPCS Level II modifier: Single drug unit dose formulation
KO is a HCPCS Level II modifier: “Single drug unit dose formulation.” It adds this detail to the code it is reported with.
Official description
KOSingle drug unit dose formulation
Short description: Single drug unit dose form
HCPCS · United States
Medicare details
The indicators CMS publishes with KO in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Apr 1, 1997
Where KO sits
- 1GroupHCPCS modifiers
- 2Modifier KOSingle drug unit dose formulation
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code KO mean?
KO is the HCPCS code for “Single drug unit dose formulation” in CMS’s HCPCS Level II October 2026 release.
Where is KO in the HCPCS Level II list?
KO is listed under Modifiers.
Does Medicare cover KO?
CMS lists KO’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside KO
All modifiersKIDmepos item, second or third month rentalKJDmepos item, parenteral enteral nutrition (pen) pump or capped rental, months four to fifteenKKDmepos item subject to dmepos competitive bidding program number 2KLDmepos item delivered via mailKMReplacement of facial prosthesis including new impression/moulageKNReplacement of facial prosthesis using previous master modelKPFirst drug of a multiple drug unit dose formulationKQSecond or subsequent drug of a multiple drug unit dose formulationKRRental item, billing for partial monthKSGlucose monitor supply for diabetic beneficiary not treated with insulinKTBeneficiary resides in a competitive bidding area and travels outside that competitive bidding area and receives a competitive bid itemKUDmepos item subject to dmepos competitive bidding program number 3