HCPCS 'C' Modifiers (20)
| Code | Description |
| CA | Procedure payable only in the inpatient setting when performed emergently on an outpatient who expires prior to admission |
| 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 |
| CC | Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed) |
| 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 |
| 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 |
| 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 |
| CG | Policy criteria applied |
| CH | 0 percent impaired, limited or restricted |
| CI | At least 1 percent but less than 20 percent impaired, limited or restricted |
| CJ | At least 20 percent but less than 40 percent impaired, limited or restricted |
| CK | At least 40 percent but less than 60 percent impaired, limited or restricted |
| CL | At least 60 percent but less than 80 percent impaired, limited or restricted |
| CM | At least 80 percent but less than 100 percent impaired, limited or restricted |
| CN | 100 percent impaired, limited or restricted |
| CO | Outpatient occupational therapy services furnished in whole or in part by an occupational therapy assistant |
| CP | Adjunctive service related to a procedure assigned to a comprehensive ambulatory payment classification (c-apc) procedure, but reported on a different claim Terminated: December 31, 2017 |
| CQ | Outpatient physical therapy services furnished in whole or in part by a physical therapist assistant |
| CR | Catastrophe/disaster related |
| 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 |
| 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 |