A modifier provides the means by which the reporting physician or provider can indicate that a service or procedure that has been performed has been altered by some specific circumstance but not changed in its definition or code.
Level I modifiers are codes and descriptors copyrighted by the American Medical Association's current procedural terminology (CPT).
Level II modifiers are codes and descriptors approved and maintained jointly by the alpha-numeric editorial panel (consisting of CMS, the Health Insurance Association of America, and the Blue Cross and Blue Shield Association).
| Modifier | Description | Effective | |
|---|---|---|---|
| K2 | Lower 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. | Jan 01, 1997 | |
| K3 | Lower extremity prosthesis functional level 3 - has the ability or potential for ambulation with variable cadence. typical of the community ambulator who has the ability to transverse most environmental barriers and may have vocational, therapeutic, or exercise activity that demands prosthetic utilization beyond simple locomotion. | Jan 01, 1997 | |
| K4 | Lower extremity prosthesis functional level 4 - has the ability or potential for prosthetic ambulation that exceeds the basic ambulation skills, exhibiting high impact, stress, or energy levels, typical of the prosthetic demands of the child, active adult, or athlete. | Jan 01, 1997 | |
| KA | Add on option/accessory for wheelchair | Jan 01, 1997 | |
| KB | Beneficiary requested upgrade for abn, more than 4 modifiers identified on claim | Jan 01, 2003 | |
| KC | Replacement of special power wheelchair interface | Jan 01, 2005 | |
| KD | Drug or biological infused through dme | Jan 01, 2004 | |
| KE | Bid under round one of the dmepos competitive bidding program for use with non-competitive bid base equipment | Jan 01, 2009 | |
| KF | Item designated by fda as class iii device | Apr 01, 2004 | |
| KG | Dmepos item subject to dmepos competitive bidding program number 1 | Jul 01, 2007 | |
| KH | Dmepos item, initial claim, purchase or first month rental | Jan 01, 1997 | |
| KI | Dmepos item, second or third month rental | Jan 01, 1997 | |
| KJ | Dmepos item, parenteral enteral nutrition (pen) pump or capped rental, months four to fifteen | Jan 01, 1997 | |
| KK | Dmepos item subject to dmepos competitive bidding program number 2 | Jul 01, 2007 | |
| KL | Dmepos item delivered via mail | Jan 01, 2009 | |
| KM | Replacement of facial prosthesis including new impression/moulage | Jan 01, 2001 | |
| KN | Replacement of facial prosthesis using previous master model | Jan 01, 2001 | |
| KO | Single drug unit dose formulation | Apr 01, 1997 | |
| KP | First drug of a multiple drug unit dose formulation | Apr 01, 1997 | |
| KQ | Second or subsequent drug of a multiple drug unit dose formulation | Apr 01, 1997 | |
| KR | Rental item, billing for partial month | Jan 01, 2002 | |
| KS | Glucose monitor supply for diabetic beneficiary not treated with insulin | Oct 01, 1998 | |
| KT | Beneficiary resides in a competitive bidding area and travels outside that competitive bidding area and receives a competitive bid item | Apr 01, 2008 | |
| KU | Dmepos item subject to dmepos competitive bidding program number 3 | Jul 01, 2007 | |
| KV | Dmepos item subject to dmepos competitive bidding program that is furnished as part of a professional service | Jan 01, 2008 |