CO-175: Incomplete Prescription
Prescription is missing required fields. Provider write-off until corrected. Complete the prescription and resubmit.
What Does CO-175 Mean?
CO-175 assigns the incomplete prescription as a provider-side documentation failure. The provider submitted a claim with a prescription that was missing required information, and the payer cannot process the claim until the prescription is complete. This is a contractual write-off until the prescription is corrected and the claim is resubmitted. The patient cannot be billed for this adjustment.
CARC 175 signals that the prescription attached to the claim does not contain all the information the payer requires for processing. Unlike CARC 173 (no prescription at all) or CARC 176 (expired prescription), this code specifically targets prescriptions that exist but are missing critical data elements. The payer reviewed the prescription and found gaps — missing dosage, absent physician signature, incomplete patient demographics, or lack of required supporting documentation.
This denial is heavily concentrated in pharmacy claims, DME orders, and any service type where a detailed written prescription is a reimbursement prerequisite. Electronic prescribing systems have reduced the frequency of this denial, but it still occurs frequently with handwritten orders, faxed prescriptions, and orders from providers who do not use standardized templates.
The code almost always appears with Group Code CO, placing responsibility squarely on the provider. The resolution is straightforward: identify what is missing, get it from the prescribing physician, and resubmit. The key challenge is often communication speed — tracking down the prescriber, getting them to amend or re-sign the order, and resubmitting within timely filing limits.
Common Causes
| Cause | Frequency |
|---|---|
| Missing patient identifying information on prescription The prescription is missing essential patient details such as full name, date of birth, or contact information needed for proper identification and verification | Most Common |
| Incomplete medication or service specifics The prescription lacks critical details about the prescribed medication or service such as drug name, dosage, frequency, duration, or quantity | Most Common |
| Missing physician signature or authorization The prescription does not include the required physician signature, NPI, or authorization credentials needed to validate the order | Common |
| Illegible handwritten prescriptions The prescription is handwritten and the payer or pharmacy cannot read critical details, rendering it functionally incomplete | Common |
| Missing supporting documentation Required supplementary documents such as prior authorization forms, medical necessity justification, or clinical notes are absent from the claim | Common |
| Non-compliance with formulary requirements The prescription does not include documentation showing compliance with the payer's formulary, such as step therapy requirements or tier exceptions | Occasional |
| Incorrect coding on the prescription claim Procedure or diagnosis codes associated with the prescription do not match or are incomplete, causing the claim to be flagged | Occasional |
| Expired or invalid prescription The prescription has passed its valid date or does not meet current regulatory requirements for prescribing | Occasional |
How to Resolve
Identify the specific missing prescription elements, obtain them from the prescribing physician, and resubmit the claim with a complete prescription.
- Audit the prescription against payer requirements Compare the submitted prescription against the payer's specific documentation requirements. Each payer may require different fields — verify what this particular payer considers mandatory.
- Complete the prescription Obtain the missing elements from the prescribing physician. Ensure the physician signs and dates any amendments to the original prescription.
- Resubmit the corrected claim Attach the completed prescription to a corrected claim submission. Reference the original claim number and note the specific corrections made.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-175:
| RARC | Description |
|---|---|
| MA130 | Your claim contains incomplete and/or invalid information, and no appeal rights are afforded. |
| N362 | The provider must obtain a signed physician order/prescription prior to dispensing/providing the service or item. |
How to Prevent CO-175
- Implement standardized prescription templates with required fields that must be completed before the order can be saved in the EHR
- Use electronic prescribing systems with built-in validation that flags incomplete orders before they are submitted
- Create a pre-submission checklist for the billing department that verifies all prescription fields are present
- Train prescribing physicians on the specific documentation requirements for each major payer
General Prevention
- Implement standardized prescription templates with required fields that must be completed before submission
- Use electronic prescribing systems with built-in prompts and required-field validation to prevent incomplete orders
- Train prescribing physicians and staff on what constitutes a complete prescription for each payer and service type
- Conduct regular audits of prescription documentation to identify common gaps and address systemic issues
- Collaborate with pharmacy staff to establish communication protocols for flagging incomplete prescriptions before claim submission
- Create checklists for billing staff to verify prescription completeness before submitting claims
Also Filed As
The same CARC 175 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/175
- https://x12.org/codes/claim-adjustment-reason-codes
- Codes maintained by X12. Visit x12.org for official definitions.