CO-222: Exceeds Contracted Maximum Units
You exceeded your contracted maximum units. This is a contractual write-off — do not bill the patient. Audit your billing, correct errors, or negotiate with the payer.
What Does CO-222 Mean?
CO-222 is the standard and expected pairing for this code. The provider exceeded the contracted volume cap, and the overage is written off as a contractual obligation. You cannot bill the patient for amounts that exceed your contracted maximums — this is solely a provider-payer contractual matter. The financial impact falls entirely on the practice.
CARC 222 is a contractual volume limitation adjustment. The payer is telling you that your practice has billed more hours, days, or units than the maximum allowed under your participation agreement for the relevant measurement period (monthly, quarterly, or annually). This is fundamentally different from a per-patient utilization denial — CARC 222 applies at the provider level regardless of individual patient needs.
This adjustment typically appears in contracts that include volume caps, such as capitated arrangements, global budgets, or agreements with hard limits on specific service categories. The 835 Healthcare Policy Identification Segment (Loop 2110) may contain details about the contracted limit, though not all payers populate this field. The key question is whether you have actually exceeded the contracted maximum or whether there is a tracking discrepancy between your records and the payer's system.
CARC 222 is almost always accompanied by Group Code CO, since the overage is a contractual matter between the provider and payer — the patient bears no responsibility for the provider exceeding volume caps. In rare multi-payer scenarios, OA may appear. Because this is a contract-level adjustment, the resolution typically involves either correcting billing errors that inflated your unit count, negotiating with the payer if their tracking is inaccurate, or accepting the write-off and adjusting future billing practices to stay within contract limits.
Common Causes
| Cause | Frequency |
|---|---|
| Provider exceeded contracted volume cap The provider has billed more hours, days, or units than the maximum allowed under their contract with the payer for the specified time period, regardless of individual patient needs | Most Common |
| Contract term misunderstanding The provider misunderstood the contracted maximum limits including the measurement period (monthly, quarterly, annual) or the specific unit types subject to the cap | Common |
| Billing or coding errors inflating unit counts Incorrect billing practices such as duplicate claims, incorrect unit quantities, or wrong time-based codes artificially inflated the unit count beyond the contracted maximum | Common |
| Payer policy change not communicated The payer modified the contracted maximum limits but did not adequately notify the provider, leading to the provider exceeding the new, lower cap | Occasional |
| Inaccurate payer tracking of accumulated units The payer's internal tracking system miscounted the provider's accumulated units for the period, incorrectly triggering the maximum limit | Occasional |
How to Resolve
Verify the contracted maximum against your actual billing volume, correct any billing errors, and negotiate with the payer if their unit tracking is inaccurate.
- Verify the contracted limits Review your participation agreement to confirm the exact volume caps. Pay attention to the measurement period, service type definitions, and any exceptions or carve-outs.
- Audit and reconcile your billing Compare your total billed units against the contract limit. If your count is lower than the payer's, prepare documentation for a reconciliation request. If billing errors inflated the count, correct them and resubmit.
- Negotiate higher limits if needed If you consistently approach or exceed the contracted maximums, document the pattern and negotiate higher volume caps during contract renewal. Present data showing patient demand and clinical necessity.
- Post the write-off If the overage is confirmed, write off the adjustment amount. Flag this contract in your system for proactive monitoring to avoid future overages.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-222:
| RARC | Description |
|---|---|
| N362 | The number of days or units of service exceeds our acceptable maximum. |
| N517 | Payment adjusted based on the contracted/legislated fee arrangement. |
How to Prevent CO-222
- Implement real-time tracking of accumulated units against contracted maximums for every payer
- Set automated alerts at 80% and 90% of the contracted cap to trigger a review before reaching the limit
- Conduct monthly or quarterly reconciliations of your unit counts against contract limits
- Negotiate volume caps that realistically reflect your practice's patient volume during contract negotiations
General Prevention
- Review and thoroughly understand all volume caps and maximum unit limitations in provider contracts before the contract period begins
- Implement utilization tracking systems that monitor accumulated units against contracted maximums in real-time throughout the period
- Set up automated alerts when unit counts approach the contracted maximum threshold (e.g., at 80% and 90% of the cap)
- Conduct regular internal audits to compare billed units against contract limits on a monthly or quarterly basis
- Establish a direct communication channel with the payer's provider relations department to discuss contract terms and any policy changes
- During contract negotiations, advocate for maximum limits that align with your patient volume and practice capacity
- Train billing staff on contract-specific unit limitations and ensure they understand the measurement periods
Also Filed As
The same CARC 222 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/222
- https://x12.org/codes/claim-adjustment-reason-codes
- https://billingfreedom.com/list-of-common-denial-codes-and-their-reasons/
- Codes maintained by X12. Visit x12.org for official definitions.