| PR-1 | Deductible Amount | PR | Collect from Patient | → |
| PR-2 | Coinsurance Amount | PR | Collect from Patient | → |
| PR-3 | Co-payment Amount | PR | Collect from Patient | → |
| CO-4 | Procedure Code Inconsistent with Modifier | CO | Verify & Resubmit | → |
| CO-5 | Procedure Code Inconsistent with Place of Service | CO | Verify & Resubmit | → |
| CO-6 | Procedure/Revenue Code Inconsistent with Patient Age | CO | Verify & Resubmit | → |
| CO-7 | Procedure/Revenue Code Inconsistent with Patient Gender | CO | Verify & Resubmit | → |
| CO-8 | Procedure Code Inconsistent with Provider Type/Specialty | CO | Verify & Resubmit | → |
| CO-9 | Diagnosis Inconsistent with Patient Age | CO | Verify & Resubmit | → |
| CO-10 | Diagnosis Inconsistent with Patient Gender | CO | Verify & Resubmit | → |
| CO-11 | Diagnosis Inconsistent with Procedure | CO | Verify & Resubmit | → |
| CO-12 | Diagnosis Inconsistent with Provider Type | CO | Verify & Resubmit | → |
| CO-13 | Date of Death Precedes Date of Service | CO | Verify & Resubmit | → |
| CO-14 | Date of Birth Follows Date of Service | CO | Verify & Resubmit | → |
| CO-16 | Missing Information or Billing Error | CO | Verify & Resubmit | → |
| CO-18 | Exact Duplicate Claim/Service | CO | Review & Decide | → |
| CO-19 | Workers' Compensation Claim | CO | Resubmit | → |
| CO-20 | Liability Carrier Responsible | CO | Resubmit | → |
| CO-21 | No-Fault Carrier Responsible | CO | Resubmit | → |
| CO-22 | Coordination of Benefits - Another Payer May Cover | CO | Resubmit | → |
| CO-23 | Prior Payer Adjudication Impact | CO | Review & Decide | → |
| CO-24 | Charges Covered Under Capitation/Managed Care | CO | Review & Decide | → |
| CO-26 | Expenses Incurred Prior to Coverage | CO | Verify & Resubmit | → |
| CO-27 | Expenses Incurred After Coverage Terminated | CO | Verify & Resubmit | → |
| CO-29 | Timely Filing Limit Expired | CO | Appeal | → |
| CO-31 | Patient Cannot Be Identified as Insured | CO | Verify & Resubmit | → |
| CO-32 | Patient Not Eligible Dependent | CO | Verify & Resubmit | → |
| CO-33 | Insured Has No Dependent Coverage | CO | Verify & Resubmit | → |
| CO-34 | No Coverage for Newborns | CO | Verify & Resubmit | → |
| CO-35 | Lifetime Benefit Maximum Reached | CO | Review & Decide | → |
| CO-39 | Services Denied at Authorization/Pre-certification | CO | Appeal | → |
| CO-40 | Charges Do Not Meet Emergent/Urgent Care Qualifications | CO | Appeal | → |
| CO-44 | Prompt-Pay Discount | CO | Review & Decide | → |
| CO-45 | Charge Exceeds Fee Schedule/Maximum Allowable | CO | Review & Decide | → |
| CO-49 | Non-Covered Routine/Preventive Exam | CO | Appeal | → |
| CO-50 | Non-Covered Service - Not Medically Necessary | CO | Appeal | → |
| CO-51 | Non-Covered Pre-existing Condition | CO | Appeal | → |
| CO-53 | Services by Immediate Relative Not Covered | CO | Review & Decide | → |
| CO-54 | Multiple Physicians/Assistants Not Covered | CO | Appeal | → |
| CO-55 | Procedure/Treatment Deemed Experimental/Investigational | CO | Appeal | → |
| CO-56 | Procedure/Treatment Not Proven Effective | CO | Appeal | → |
| CO-58 | Inappropriate or Invalid Place of Service | CO | Appeal | → |
| CO-59 | Multiple/Concurrent Procedure Rules Applied | CO | Review & Decide | → |
| CO-60 | Outpatient Services Not Covered Near Inpatient Stay | CO | Review & Decide | → |
| CO-61 | Failure to Obtain Second Surgical Opinion | CO | Appeal | → |
| PR-66 | Blood Deductible | PR | Collect from Patient | → |
| CO-69 | Day Outlier Amount | CO | Review & Decide | → |
| CO-70 | Cost Outlier Adjustment | CO | Review & Decide | → |
| CO-74 | Indirect Medical Education Adjustment | CO | Review & Decide | → |
| CO-75 | Direct Medical Education Adjustment | CO | Review & Decide | → |
| CO-76 | Disproportionate Share Adjustment | CO | Review & Decide | → |
| CO-78 | Non-Covered Days / Room Charge Adjustment | CO | Review & Decide | → |
| PR-85 | Patient Interest Adjustment | PR | Collect from Patient | → |
| CO-89 | Professional Fees Removed from Charges | CO | Verify & Resubmit | → |
| CO-90 | Ingredient Cost Adjustment | CO | Verify & Resubmit | → |
| CO-91 | Dispensing Fee Adjustment | CO | Review & Decide | → |
| CO-94 | Processed in Excess of Charges | CO | Review & Decide | → |
| CO-95 | Plan Procedures Not Followed | CO | Verify & Resubmit | → |
| CO-96 | Non-Covered Charges | CO | Verify & Resubmit | → |
| CO-97 | Bundled Service — Not Paid Separately | CO | Review & Decide | → |
| OA-100 | Payment Made to Patient/Insured | OA | Collect from Patient | → |
| CO-101 | Predetermination: Anticipated Payment | CO | Verify & Resubmit | → |
| CO-102 | Major Medical Adjustment | CO | Review & Decide | → |
| CO-103 | Provider Promotional Discount | CO | Review & Decide | → |
| CO-104 | Managed Care Withhold | CO | Review & Decide | → |
| OA-105 | Tax Withholding Amount | OA | Verify & Resubmit | → |
| CO-106 | Patient Payment Option Not in Effect | CO | Verify & Resubmit | → |
| CO-107 | Related or Qualifying Service Not Identified | CO | Verify & Resubmit | → |
| CO-108 | Rent/Purchase Guidelines Not Met | CO | Verify & Resubmit | → |
| CO-109 | Claim Not Covered by This Payer | CO | Verify & Resubmit | → |
| CO-110 | Billing Date Predates Service Date | CO | Verify & Resubmit | → |
| CO-111 | Not Covered Unless Provider Accepts Assignment | CO | Verify & Resubmit | → |
| CO-112 | Service Not Furnished Directly or Not Documented | CO | Verify & Resubmit | → |
| CO-114 | Procedure/Product Not FDA Approved | CO | Verify & Resubmit | → |
| CO-115 | Procedure Postponed, Canceled, or Delayed | CO | Verify & Resubmit | → |
| CO-116 | Advance Indemnification Notice Requirements Not Met | CO | Review & Decide | → |
| CO-117 | Transportation to Nearest Facility | CO | Verify & Resubmit | → |
| CO-118 | ESRD Network Support Adjustment | CO | Review & Decide | → |
| CO-119 | Benefit Maximum Reached | CO | Review & Decide | → |
| OA-121 | Indemnification Adjustment | OA | Review & Decide | → |
| CO-122 | Psychiatric Services Reduction | CO | Review & Decide | → |
| CO-128 | Newborn Services in Mother's Allowance | CO | Verify & Resubmit | → |
| CO-129 | Prior Processing Information Incorrect | CO | Verify & Resubmit | → |
| CO-130 | Claim Submission Fee | CO | Review & Decide | → |
| CO-131 | Claim-Specific Negotiated Discount | CO | Review & Decide | → |
| CO-132 | Prearranged Demonstration Project Adjustment | CO | Review & Decide | → |
| OA-133 | Service Line Pending Further Review | OA | Verify & Resubmit | → |
| CO-134 | Technical Fees Removed | CO | Verify & Resubmit | → |
| CO-135 | Interim Bills Cannot Be Processed | CO | Verify & Resubmit | → |
| OA-136 | Failure to Follow Prior Payer's Coverage Rules | OA | Verify & Resubmit | → |
| OA-137 | Regulatory Surcharges, Assessments, or Health-Related Taxes | OA | Review & Decide | → |
| CO-139 | Contracted Funding Agreement — Subscriber Employed by Provider | CO | Review & Decide | → |
| CO-140 | Patient ID Number and Name Do Not Match | CO | Verify & Resubmit | → |
| PR-142 | Monthly Medicaid Patient Liability Amount | PR | Collect from Patient | → |
| OA-143 | Portion of Payment Deferred | OA | Review & Decide | → |
| CO-144 | Incentive Adjustment for Preferred Product/Service | CO | Review & Decide | → |
| CO-146 | Diagnosis Invalid for Date of Service | CO | Verify & Resubmit | → |
| CO-147 | Provider Accepted Reduced Payment from Regulatory Authority | CO | Review & Decide | → |
| CO-148 | Information from Another Provider Not Provided or Incomplete | CO | Verify & Resubmit | → |
| CO-149 | Lifetime Benefit Maximum Reached | CO | Review & Decide | → |
| CO-150 | Information Does Not Support Level of Service | CO | Appeal | → |
| CO-151 | Information Does Not Support Frequency of Services | CO | Appeal | → |
| CO-152 | Information Does Not Support Length of Service | CO | Appeal | → |
| CO-153 | Information Does Not Support Dosage | CO | Appeal | → |
| CO-154 | Information Does Not Support Day's Supply | CO | Verify & Resubmit | → |
| CO-155 | Patient Refused the Service/Procedure | CO | Review & Decide | → |
| CO-157 | Service Provided as Result of Act of War | CO | Appeal | → |
| CO-158 | Service Provided Outside the United States | CO | Review & Decide | → |
| CO-159 | Service Provided as Result of Terrorism | CO | Appeal | → |
| CO-160 | Benefit Exclusion: Injury from Excluded Activity | CO | Appeal | → |
| CO-161 | Provider Performance Bonus | CO | Review & Decide | → |
| CO-163 | Attachment/Documentation Referenced on Claim Not Received | CO | Resubmit | → |
| CO-164 | Attachment/Documentation Not Received in Timely Fashion | CO | Appeal | → |
| CO-166 | Payer's Responsibility Ended Before Service Date | CO | Verify & Resubmit | → |
| CO-167 | Diagnosis Not Covered | CO | Verify & Resubmit | → |
| CO-169 | Alternate Benefit Provided | CO | Review & Decide | → |
| CO-170 | Payment Denied for This Provider Type | CO | Verify & Resubmit | → |
| CO-171 | Payment Denied for Provider Type in This Facility Type | CO | Verify & Resubmit | → |
| CO-172 | Payment Adjusted for Provider Specialty | CO | Verify & Resubmit | → |
| CO-173 | Service Not Prescribed by a Physician | CO | Resubmit | → |
| CO-174 | Service Not Prescribed Prior to Delivery | CO | Verify & Resubmit | → |
| CO-175 | Prescription Is Incomplete | CO | Resubmit | → |
| CO-176 | Prescription Is Not Current | CO | Resubmit | → |
| CO-177 | Patient Has Not Met Required Eligibility Requirements | CO | Review & Decide | → |
| CO-178 | Patient Has Not Met Spend Down Requirements | CO | Verify & Resubmit | → |
| CO-179 | Patient Has Not Met Required Waiting Period | CO | Review & Decide | → |
| CO-180 | Patient Has Not Met Residency Requirements | CO | Review & Decide | → |
| CO-181 | Procedure Code Invalid on Date of Service | CO | Verify & Resubmit | → |
| CO-182 | Procedure Modifier Invalid on Date of Service | CO | Verify & Resubmit | → |
| CO-183 | Referring Provider Not Eligible to Refer | CO | Verify & Resubmit | → |
| CO-184 | Prescribing/Ordering Provider Not Eligible to Prescribe/Order | CO | Verify & Resubmit | → |
| CO-185 | Rendering Provider Not Eligible to Perform Service | CO | Verify & Resubmit | → |
| CO-186 | Level of Care Change Adjustment | CO | Appeal | → |
| CO-187 | Consumer Spending Account Payment Not Approved | CO | Review & Decide | → |
| CO-188 | Product/Procedure Not Covered Unless FDA-Recommended | CO | Appeal | → |
| CO-189 | No Specific Procedure Code for Service Billed | CO | Verify & Resubmit | → |
| CO-190 | Billing for SNF Qualified Stay Already Covered | CO | Review & Decide | → |
| CO-192 | Non-Standard Adjustment Code from Paper Remittance | CO | Verify & Resubmit | → |
| CO-193 | Original Payment Decision Maintained on Review | CO | Appeal | → |
| CO-194 | Anesthesia by Operating/Assistant/Attending Physician | CO | Verify & Resubmit | → |
| OA-195 | Refund to Erroneous Priority Payer | OA | Verify & Resubmit | → |
| CO-197 | Precertification/Authorization/Notification Absent | CO | Verify & Resubmit | → |
| CO-198 | Precertification/Authorization Limits Exceeded | CO | Appeal | → |
| CO-199 | Revenue Code and Procedure Code Mismatch | CO | Verify & Resubmit | → |
| CO-200 | Expenses Incurred During Lapse in Coverage | CO | Verify & Resubmit | → |
| PR-201 | Patient Responsibility via Set-Aside Arrangement | PR | Collect from Patient | → |
| CO-202 | Non-Covered Personal Comfort or Convenience Services | CO | Appeal | → |
| CO-203 | Discontinued or Reduced Service | CO | Verify & Resubmit | → |
| CO-204 | Service/Equipment/Drug Not Covered Under Benefit Plan | CO | Appeal | → |
| CO-205 | Pharmacy Discount Card Processing Fee | CO | Review & Decide | → |
| CO-206 | National Provider Identifier - Missing | CO | Verify & Resubmit | → |
| CO-207 | National Provider Identifier - Invalid Format | CO | Verify & Resubmit | → |
| CO-208 | National Provider Identifier - Not Matched | CO | Verify & Resubmit | → |
| OA-209 | Provider Cannot Collect from Patient per Regulatory Agreement | OA | Review & Decide | → |
| CO-210 | Pre-Certification/Authorization Not Received Timely | CO | Appeal | → |
| CO-211 | National Drug Codes (NDC) Not Eligible for Rebate, Not Covered | CO | Verify & Resubmit | → |
| CO-212 | Administrative Surcharges Not Covered | CO | Review & Decide | → |
| CO-213 | Non-Compliance with Physician Self-Referral Prohibition | CO | Appeal | → |
| CO-215 | Based on Subrogation of a Third Party Settlement | CO | Review & Decide | → |
| CO-216 | Based on Findings of a Review Organization | CO | Appeal | → |
| CO-219 | Based on Extent of Injury | CO | Appeal | → |
| CO-222 | Exceeds Contracted Maximum Hours/Days/Units | CO | Appeal | → |
| CO-223 | Mandated Federal/State/Local Law Adjustment | CO | Review & Decide | → |
| CO-224 | Patient Identification Compromised by Identity Theft | CO | Verify & Resubmit | → |
| OA-225 | Penalty or Interest Payment by Payer | OA | Review & Decide | → |
| CO-226 | Provider Information Not Provided or Insufficient | CO | Verify & Resubmit | → |
| CO-227 | Patient/Insured Information Not Provided or Insufficient | CO | Verify & Resubmit | → |
| CO-228 | Denied for Failure to Supply Information to Previous Payer | CO | Verify & Resubmit | → |
| PR-229 | Partial Charge Not Considered Due to Type of Bill 12X | PR | Collect from Patient | → |
| CO-231 | Mutually Exclusive Procedures | CO | Verify & Resubmit | → |
| CO-232 | Institutional Transfer Amount | CO | Review & Decide | → |
| CO-233 | Hospital-Acquired Condition or Preventable Medical Error | CO | Appeal | → |
| CO-234 | Procedure Not Paid Separately | CO | Verify & Resubmit | → |
| CO-235 | Sales Tax | CO | Review & Decide | → |
| CO-236 | Procedure/Modifier Not Compatible per NCCI | CO | Verify & Resubmit | → |
| CO-237 | Legislated/Regulatory Penalty | CO | Review & Decide | → |
| PR-238 | Claim Spans Eligible/Ineligible Periods - Ineligible Reduction | PR | Collect from Patient | → |
| CO-239 | Claim Spans Eligible/Ineligible Periods - Rebill Separately | CO | Verify & Resubmit | → |
| CO-240 | Diagnosis Inconsistent with Patient's Birth Weight | CO | Verify & Resubmit | → |
| PR-241 | Low Income Subsidy (LIS) Co-payment Amount | PR | Collect from Patient | → |
| CO-242 | Services Not Provided by Network/Primary Care Providers | CO | Appeal | → |
| CO-243 | Services Not Authorized by Network/Primary Care Providers | CO | Appeal | → |
| CO-245 | Provider Performance Program Withhold | CO | Review & Decide | → |
| CO-246 | Non-Payable Code for Required Reporting Only | CO | Review & Decide | → |
| PR-247 | Deductible for Professional Service in Institutional Setting | PR | Collect from Patient | → |
| PR-248 | Coinsurance for Professional Service in Institutional Setting | PR | Collect from Patient | → |
| CO-249 | Claim Identified as Readmission | CO | Appeal | → |
| CO-250 | Incorrect Attachment/Documentation Received | CO | Verify & Resubmit | → |
| CO-251 | Incomplete or Deficient Attachment/Documentation Received | CO | Verify & Resubmit | → |
| CO-252 | Attachment Required to Adjudicate Claim | CO | Resubmit | → |
| CO-253 | Sequestration Reduction in Federal Payment | CO | Review & Decide | → |
| CO-254 | Dental Plan Benefits Not Available - Submit to Medical | CO | Resubmit | → |
| CO-256 | Service Not Payable Per Managed Care Contract | CO | Review & Decide | → |
| OA-257 | Claim Undetermined During Premium Grace Period (HIX) | OA | Review & Decide | → |
| CO-258 | Claim Not Covered - Patient in Custody or Incarcerated | CO | Resubmit | → |
| CO-259 | Additional Payment for Dental/Vision Service Utilization | CO | Verify & Resubmit | → |
| CO-260 | Processed Under Medicaid ACA Enhanced Fee Schedule | CO | Review & Decide | → |
| CO-261 | Procedure Inconsistent with Patient History | CO | Appeal | → |
| CO-262 | Adjustment for Delivery Cost (Pharmaceuticals Only) | CO | Verify & Resubmit | → |
| CO-263 | Adjustment for Shipping Cost (Pharmaceuticals Only) | CO | Verify & Resubmit | → |
| CO-264 | Adjustment for Postage Cost (Pharmaceuticals Only) | CO | Verify & Resubmit | → |
| CO-265 | Adjustment for Administrative Cost (Pharmaceuticals Only) | CO | Verify & Resubmit | → |
| CO-266 | Adjustment for Compound Preparation Cost (Pharmaceuticals Only) | CO | Verify & Resubmit | → |
| CO-267 | Claim/Service Spans Multiple Months | CO | Resubmit | → |
| CO-268 | Claim Spans Two Calendar Years | CO | Resubmit | → |
| CO-269 | Anesthesia Not Covered for This Procedure | CO | Appeal | → |
| CO-270 | Medical Plan Benefits Not Available - Submit to Dental | CO | Resubmit | → |
| OA-271 | Prior Contractual Reductions on Current Payment Schedule | OA | Review & Decide | → |
| CO-272 | Coverage/Program Guidelines Were Not Met | CO | Appeal | → |
| CO-273 | Coverage/Program Guidelines Were Exceeded | CO | Appeal | → |
| CO-274 | Fee/Service Not Payable — Care Coordination Arrangement | CO | Verify & Resubmit | → |
| PR-275 | Prior Payer Patient Responsibility Not Covered | PR | Collect from Patient | → |
| CO-276 | Prior Payer Denied Services Not Covered by This Payer | CO | Appeal | → |
| OA-277 | Claim Undetermined During SHOP Exchange Grace Period | OA | Review & Decide | → |
| CO-278 | Performance Program Proficiency Requirements Not Met | CO | Review & Decide | → |
| CO-279 | Services Not Provided by Preferred Network Providers | CO | Appeal | → |
| CO-280 | Medical Plan Benefits Not Available - Submit to Pharmacy | CO | Resubmit | → |
| CO-281 | Deductible Waived Per Contractual Agreement | CO | Review & Decide | → |
| CO-282 | Procedure/Revenue Code Does Not Match Type of Bill | CO | Resubmit | → |
| CO-283 | Attending Provider Not Eligible to Direct Care | CO | Verify & Resubmit | → |
| CO-284 | Authorization Valid But Does Not Apply to Billed Services | CO | Verify & Resubmit | → |
| CO-285 | Appeal Procedures Not Followed | CO | Appeal | → |
| CO-286 | Appeal Time Limits Not Met | CO | Appeal | → |
| CO-287 | Referral Exceeded | CO | Verify & Resubmit | → |
| CO-288 | Referral Absent | CO | Verify & Resubmit | → |
| CO-289 | Dental and Medical Plans Considered - Benefits Not Available | CO | Review & Decide | → |
| CO-290 | Dental Plan Benefits Not Available - Forwarded to Medical | CO | Resubmit | → |
| CO-291 | Medical Plan Benefits Not Available - Forwarded to Dental | CO | Resubmit | → |
| CO-292 | Medical Plan Benefits Not Available - Forwarded to Pharmacy | CO | Resubmit | → |
| OA-293 | Payment Made to Employer | OA | Review & Decide | → |
| OA-294 | Payment Made to Attorney | OA | Review & Decide | → |
| CO-295 | Pharmacy Direct/Indirect Remuneration (DIR) Adjustment | CO | Review & Decide | → |
| CO-296 | Authorization Valid But Does Not Apply to Provider | CO | Verify & Resubmit | → |
| CO-297 | Medical Plan Benefits Not Available - Submit to Vision | CO | Resubmit | → |
| CO-298 | Medical Plan Benefits Not Available - Forwarded to Vision | CO | Resubmit | → |
| CO-299 | Billing Provider Not Eligible for Payment | CO | Verify & Resubmit | → |
| CO-300 | Medical Plan Benefits Not Available - Submit to Behavioral Health | CO | Resubmit | → |
| CO-301 | Medical Plan Claim — Submit to Behavioral Health Plan | CO | Verify & Resubmit | → |
| CO-302 | Precertification/Authorization Time Limit Expired | CO | Verify & Resubmit | → |
| CO-303 | Prior Payer Patient Responsibility Not Covered for QMB | CO | Review & Decide | → |
| CO-304 | Medical Plan Claim — Submit to Hearing Plan | CO | Verify & Resubmit | → |
| CO-305 | Medical Plan Claim — Forwarded to Hearing Plan | CO | Review & Decide | → |
| CO-306 | Type of Bill Inconsistent with Patient Status | CO | Resubmit | → |
| CO-307 | Medicare Maximum Fair Price Standard Default Refund Amount | CO | Review & Decide | → |
| CO-308 | Contracted Funding Agreement Adjustment | CO | Review & Decide | → |
| CO-A0 | Patient Refund Amount | CO | Review & Decide | → |
| CO-A1 | Claim/Service Denied — Remark Code Required | CO | Resubmit | → |
| CO-A5 | Medicare PPS Capital Cost Outlier Amount | CO | Review & Decide | → |
| CO-A6 | Prior Hospitalization or 30-Day Transfer Requirement Not Met | CO | Appeal | → |
| CO-A8 | Ungroupable DRG | CO | Resubmit | → |
| CO-B1 | Non-Covered Visits | CO | Review & Decide | → |
| CO-B10 | Allowed Amount Reduced — Component of Basic Procedure Already Paid | CO | Review & Decide | → |
| CO-B11 | Claim Transferred to Proper Payer — Not Covered Here | CO | Verify & Resubmit | → |
| CO-B12 | Services Not Documented in Patient Medical Records | CO | Appeal | → |
| CO-B13 | Previously Paid — Duplicate Payment | CO | Review & Decide | → |
| CO-B14 | Only One Visit/Consultation Per Physician Per Day Covered | CO | Resubmit | → |
| CO-B15 | Qualifying Service/Procedure Not Received or Covered | CO | Verify & Resubmit | → |
| CO-B16 | New Patient Qualifications Not Met | CO | Resubmit | → |
| CO-B20 | Service Partially or Fully Furnished by Another Provider | CO | Resubmit | → |
| CO-B22 | Payment Adjusted Based on Diagnosis | CO | Resubmit | → |
| CO-B23 | Procedure Not Authorized Per CLIA Proficiency Test | CO | Verify & Resubmit | → |
| CO-B4 | Late Filing Penalty | CO | Review & Decide | → |
| CO-B7 | Provider Not Certified/Eligible for This Service on This Date | CO | Verify & Resubmit | → |
| CO-B8 | Alternative Services Available — Should Have Been Utilized | CO | Appeal | → |
| CO-B9 | Patient Enrolled in Hospice | CO | Verify & Resubmit | → |
| CO-P1 | State-Mandated Requirement — Property and Casualty Only | CO | Review & Decide | → |
| CO-P10 | Payment Reduced to Zero Due to Litigation — P&C Only | CO | Review & Decide | → |
| CO-P11 | P&C Claim Disposition Pending Due to Litigation | CO | Review & Decide | → |
| CO-P12 | Workers' Compensation Jurisdictional Fee Schedule Adjustment | CO | Review & Decide | → |
| CO-P13 | Payment Reduced/Denied Per WC Jurisdictional Regulations | CO | Appeal | → |
| CO-P14 | Service Included in Another Service Payment — P&C Only | CO | Review & Decide | → |
| CO-P15 | WC Medical Treatment Guideline Adjustment | CO | Appeal | → |
| CO-P16 | Provider Not Authorized for WC Treatment in This Jurisdiction | CO | Verify & Resubmit | → |
| CO-P2 | Not Work-Related — Workers' Compensation Not Liable | CO | Verify & Resubmit | → |
| PR-P3 | Workers' Compensation Case Settled — Patient Responsible via MSA | PR | Collect from Patient | → |
| CO-P4 | Workers' Compensation Claim Non-Compensable | CO | Verify & Resubmit | → |
| CO-P5 | Reasonable and Customary Fee Adjustment — P&C Only | CO | Review & Decide | → |
| CO-P6 | Adjustment Based on Entitlement to Benefits — P&C Only | CO | Verify & Resubmit | → |
| CO-P7 | Billed Code Not in Fee Schedule/Database — P&C Only | CO | Resubmit | → |
| CO-P8 | Claim Under Investigation — P&C Only | CO | Review & Decide | → |
| CO-P9 | No CPT/HCPCS Code Available — P&C Only | CO | Resubmit | → |