CO-174: Service Not Prescribed Prior to Delivery
Service delivered before prescription was documented. Provider write-off until corrected. Provide dated evidence of the prior order and resubmit.
What Does CO-174 Mean?
CO-174 places the financial responsibility on the provider because the service was delivered without a prior prescription — a compliance failure in the provider's ordering workflow. The provider cannot bill the patient for this adjustment. The claim must be corrected and resubmitted with evidence that the prescription preceded service delivery, or the amount must be written off.
CARC 174 fires when the payer determines that the billed service was rendered before a physician prescribed it. This is a prescription timing issue rather than a complete absence of an order (which would be CARC 173). The payer's adjudication system checks whether the prescription date precedes the date of service, and when it does not, the claim is denied under this code.
This denial is most common in settings where services are delivered on an urgent or expedited basis — for example, a DME supplier shipping equipment before receiving the signed order, or a home health agency starting visits before the face-to-face encounter is documented. It also occurs when there are administrative delays in formalizing verbal orders, resulting in the written prescription being dated after services were already rendered.
The code appears predominantly with Group Code CO, making this a provider-side write-off until corrected. Resolution centers on demonstrating that a valid prescription existed before the service date, or on obtaining a retroactive order if the payer's policy allows one. Prevention is straightforward: build workflows that physically block service delivery from proceeding until the prescription is documented and dated.
Common Causes
| Cause | Frequency |
|---|---|
| Service delivered before prescription was obtained The provider rendered the service or treatment before the prescribing physician had documented and signed the order, resulting in a timeline compliance failure | Most Common |
| Documentation gaps in prescription timing The prescription exists but is dated after the date of service, or the documentation does not clearly establish that the order preceded the service delivery | Most Common |
| Delayed or retroactive prescriptions Administrative errors or miscommunication caused the prescription to be created after the service was already rendered, and the payer does not accept retroactive orders | Common |
| Invalid or incomplete prescription data The prescription contains incorrect physician names, wrong dates, or is missing essential billing details required by the payer to verify prior ordering | Common |
| Missing prior authorization for time-sensitive services The payer required prior authorization that was not obtained before delivering the service, and emergency exemptions were not documented or applicable | Common |
| Communication breakdown between referring and treating providers Poor coordination between the referring physician and the provider delivering the service resulted in the order not being documented before the service date | Occasional |
How to Resolve
Prove the prescription preceded service delivery with dated documentation, or obtain a retroactive order if permitted, then resubmit the corrected claim.
- Verify the prescription timeline Check the EHR for order entry timestamps and compare against the service date. If the order was entered before the service date, the denial may be a documentation submission error rather than a true timing issue.
- Gather dated evidence Collect all timestamped documentation showing the prescription preceded service delivery: EHR audit logs, fax confirmations, verbal order notes with dates.
- Resubmit with supporting documentation Attach the dated prescription and supporting evidence to a corrected claim. Include a cover letter explaining the chronology and referencing the original claim number.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-174:
| RARC | Description |
|---|---|
| N362 | The provider must obtain a signed physician order/prescription prior to dispensing/providing the service or item. |
| N522 | A prescription is required for this service/item. |
How to Prevent CO-174
- Implement workflow controls that require a documented, dated physician prescription before any service can be scheduled or delivered
- Use electronic order entry systems that timestamp prescriptions and prevent service delivery from proceeding without an active order
- Establish a pre-service checklist requiring verification that the prescription date precedes the planned service date
- Train clinical staff to formalize verbal orders in writing immediately rather than after services are rendered
General Prevention
- Implement a robust system for documenting and tracking prescriptions with timestamps that clearly show the order preceded service delivery
- Establish clear communication channels with referring physicians to ensure all orders are received and documented before services are rendered
- Train staff on proper protocols for verifying prescription status before scheduling and delivering services
- Use electronic order entry systems that require a valid prescription before a service can be scheduled or billed
- Create workflow checkpoints that prevent service delivery from proceeding without a documented physician order
- Stay updated on payer-specific requirements regarding prescription timing and retroactive order policies
Also Filed As
The same CARC 174 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/174
- https://x12.org/codes/claim-adjustment-reason-codes
- Codes maintained by X12. Visit x12.org for official definitions.