Modifier Description   Effective
CN100 percent impaired, limited or restrictedJan 01, 2013
COOutpatient occupational therapy services furnished in whole or in part by an occupational therapy assistantJan 01, 2019
CPAdjunctive service related to a procedure assigned to a comprehensive ambulatory payment classification (c-apc) procedure, but reported on a different claimJan 01, 2018
CQOutpatient physical therapy services furnished in whole or in part by a physical therapist assistantJan 01, 2019
CRCatastrophe/disaster relatedAug 21, 2005
CSCost-sharing waived for specified covid-19 testing-related services that result in and order for or administration of a covid-19 test and/or used for cost-sharing waived preventive services furnished via telehealth in rural health clinics and federally qualified health centers during the covid-19 public health emergencyMar 01, 2020
CTComputed tomography services furnished using equipment that does not meet each of the attributes of the national electrical manufacturers association (nema) xr-29-2013 standardJan 01, 2016
DAOral health assessment by a licensed health professional other than a dentistJan 01, 2011
E1Upper left, eyelidJan 01, 1999
E2Lower left, eyelidJan 01, 1999
E3Upper right, eyelidJan 01, 1999
E4Lower right, eyelidJan 01, 1999
EAErythropoetic stimulating agent (esa) administered to treat anemia due to anti-cancer chemotherapyJan 01, 2008
EBErythropoetic stimulating agent (esa) administered to treat anemia due to anti-cancer radiotherapyJan 01, 2008
ECErythropoetic stimulating agent (esa) administered to treat anemia not due to anti-cancer radiotherapy or anti-cancer chemotherapyJan 01, 2008
EDHematocrit level has exceeded 39% (or hemoglobin level has exceeded 13.0 g/dl) for 3 or more consecutive billing cycles immediately prior to and including the current cycleJan 01, 2008
EEHematocrit level has not exceeded 39% (or hemoglobin level has not exceeded 13.0 g/dl) for 3 or more consecutive billing cycles immediately prior to and including the current cycleJan 01, 2008
EJSubsequent claims for a defined course of therapy, e.g., epo, sodium hyaluronate, infliximabJan 01, 2000
EMEmergency reserve supply (for esrd benefit only)Jan 01, 1997
EPService provided as part of medicaid early periodic screening diagnosis and treatment (epsdt) programJan 01, 1997
ERItems and services furnished by a provider-based, off-campus emergency departmentJan 01, 2019
ETEmergency servicesJan 01, 2002
EXExpatriate beneficiaryApr 01, 2015
EYNo physician or other licensed health care provider order for this item or serviceJan 01, 2003
F1Left hand, second digitJan 01, 1999