HCPCS modifier codes starting with C

20 codes. Every code ever valid for billing is listed, including those now retired.

Code	Description	Status
CA	Procedure payable only in the inpatient setting when performed emergently on an outpatient who expires prior to admission	Valid
CB	Service ordered by a renal dialysis facility (rdf) physician as part of the esrd beneficiary's dialysis benefit, is not part of the composite rate, and is separately reimbursable	Valid
CC	Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)	Valid
CD	Amcc test has been ordered by an esrd facility or mcp physician that is part of the composite rate and is not separately billable	Valid
CE	Amcc test has been ordered by an esrd facility or mcp physician that is a composite rate test but is beyond the normal frequency covered under the rate and is separately reimbursable based on medical necessity	Valid
CF	Amcc test has been ordered by an esrd facility or mcp physician that is not part of the composite rate and is separately billable	Valid
CG	Policy criteria applied	Valid
CH	0 percent impaired, limited or restricted	Valid
CI	At least 1 percent but less than 20 percent impaired, limited or restricted	Valid
CJ	At least 20 percent but less than 40 percent impaired, limited or restricted	Valid
CK	At least 40 percent but less than 60 percent impaired, limited or restricted	Valid
CL	At least 60 percent but less than 80 percent impaired, limited or restricted	Valid
CM	At least 80 percent but less than 100 percent impaired, limited or restricted	Valid
CN	100 percent impaired, limited or restricted	Valid
CO	Outpatient occupational therapy services furnished in whole or in part by an occupational therapy assistant	Valid
CP	Adjunctive service related to a procedure assigned to a comprehensive ambulatory payment classification (c-apc) procedure, but reported on a different claim through FY2026	Terminated
CQ	Outpatient physical therapy services furnished in whole or in part by a physical therapist assistant	Valid
CR	Catastrophe/disaster related	Valid
CS	Cost-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 emergency	Valid
CT	Computed tomography services furnished using equipment that does not meet each of the attributes of the national electrical manufacturers association (nema) xr-29-2013 standard	Valid