CO-180: Patient Has Not Met Residency Requirements
Provider bears this denial contractually. Appeal with proof of residency if the patient lives within the service area.
What Does CO-180 Mean?
With CO (Contractual Obligation), the residency requirement was not met and the denial is the provider's contractual responsibility. If the patient does reside within the service area, appeal with proof of residency. If not, the provider may need to help the patient update their enrollment or redirect the claim.
CARC 180 appears when a payer determines that the patient does not reside within the geographic area required for coverage. Many insurance plans, particularly Medicaid programs and HMOs, require patients to live within a defined service area. If the patient's address falls outside this area, the payer will deny the claim.
This code is most common with state Medicaid programs that require physical residency within the state, HMO plans with defined service area boundaries, and plans that restrict coverage to specific geographic regions. The denial may result from an actual residency issue, an outdated address on file, or a recent relocation that has not been reflected in the patient's enrollment records.
Common Causes
| Cause | Frequency |
|---|---|
| Patient does not reside in the plan's service area The patient's address of record is outside the payer's service area or the geographic region covered by the plan, making them ineligible for coverage | Most Common |
| State Medicaid residency requirement not met The patient does not meet the state's residency requirement for Medicaid eligibility, which typically requires physical presence in the state with intent to remain | Most Common |
| Patient relocated but enrollment not updated The patient moved to a new state or service area but did not update their enrollment information, resulting in coverage under the wrong plan or region | Common |
| Temporary residency not accepted The patient is temporarily residing in the plan's service area (such as a student or temporary worker) and does not meet permanent residency requirements | Occasional |
How to Resolve
- Verify the patient's address against the service area Confirm the patient's current residential address and whether it falls within the plan's coverage area.
- Appeal with residency documentation Submit proof such as a utility bill, driver's license, lease agreement, or other official document showing the patient resides within the service area.
- Help the patient update records if they relocated If the patient moved, assist them in updating their enrollment to the correct plan or region for their new address.
- For Medicaid patients, verify state residency Confirm the patient meets the state's residency requirements, which typically require physical presence with intent to remain.
Appeal with proof of patient residency such as a utility bill, driver's license, lease agreement, or other documentation showing the patient resides within the plan's service area.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-180:
| RARC | Description |
|---|---|
| N130 | You may need to review plan documents or guidelines Review the plan's residency and service area requirements → |
How to Prevent CO-180
- Verify patient residency and service area eligibility during eligibility checks
- Ask patients about address changes at each visit and update records promptly
- For Medicaid patients, confirm state residency requirements are met before providing services
- Maintain awareness of each plan's service area boundaries for accurate eligibility verification
- Help patients update their enrollment information when they relocate
Also Filed As
The same CARC 180 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code-carcs
- https://x12.org/codes/claim-adjustment-reason-codes
- https://portal.ct.gov/-/media/ohs/health-it-advisory-council/apcd-advisory-group/data-submission-guide-workgroup/meeting-materials/6-30-22/carc-codes_final.pdf
- https://medicaid-documents.dhhs.utah.gov/Documents/pdfs/ClaimDenialCodes.pdf
- Codes maintained by X12. Visit x12.org for official definitions.