CARC Code
66
Blood Deductible Applied
The patient is responsible for paying a deductible that applies specifically to blood products or blood services. This is a separate deductible from the general medical deductible.
patient responsibilityHow to resolve this denial
Bill patient for blood deductible amount per plan terms
- 1
Verify patient's cost-share obligation on the Explanation of Benefits
- 2
Cross-reference with the patient's Summary of Benefits and Coverage
- 3
Calculate the correct patient responsibility amount
- 4
Issue a patient statement within 30 days of claim adjudication
- 5
Document the patient balance in the account notes
▶✓ Pre-action checklist — verify before contacting the payer
Review the full remittance advice (ERA/EOB) for additional RARC codes that explain the denial.
Verify the claim was submitted with correct patient eligibility and benefit information.
Check if this denial applies to a specific line item or the entire claim.
▶More about PR-66 — stats, related codes, appeal template
95%
Recovery Rate
3-7 days
Avg. Resolution
Easy
Difficulty
Rare
Frequency
Payer-Specific Notes
How major payers handle CARC 66 by specialty.
UnitedHealthcare
Confirm individual vs. family accumulation before billing patient.
Appeal Letter Template
Generic appeal template for CARC 66 denials.
We are submitting a formal appeal for claim [CLAIM_NUMBER] for patient [PATIENT_NAME], date of service [DOS]. This claim was denied/adjusted with CARC 66 indicating: "Blood Deductible.." We have reviewed the claim and are providing the attached documentation to support reconsideration. [SUPPORTING_DOCUMENTATION]. Please reconsider payment per the terms of our contract.
Need to resolve this denial?
Get a step-by-step resolution plan with payer-specific guidance and appeal letter generation.
Resolve this denial →