What is reason code 24?

Reason code CO-24 means that the billed service is covered under a capitation agreement or managed care plan, meaning the insurer considers the service already prepaid through a fixed monthly fee.

What CO-24 Means

• Contractual Obligation (CO): The "CO" group code means it is a contractual adjustment.
• No Patient Billing: You cannot bill the patient for this balance.
• Prepaid Care: The provider receives a set per-patient amount, so separate fee-for-service billing is rejected.

Why It Happens

• Bundled Services: Billed separately for care included in a capitation bundle.
• Wrong Payer: Submitted to traditional Medicare or Medicaid instead of a Managed Care Organization (MCO).
• Missing Referral: Lacked a required prior authorization or referral.

How to Fix It

• Verify Coverage: Check patient eligibility and contract terms to see if the service is bundled or carved out.
• Resubmit Correctly: Send the claim to the correct managed care payer if it was misrouted.
• Write Off: Treat the denied charge as a contractual write-off if the service is fully covered under capitation.

Value Code 24 on a medical insurance claim (such as a UB-04 or institutional claim form) stands for a Medicaid Rate Code or Recurring Monthly Income, depending on the specific state billing guidelines.

Main Meanings

• Medicaid Rate Code: In many state Medicaid programs (such as New York and California), Value Code 24 is used to report a specific 4-digit rate code assigned by the state Department of Health. This code defines the exact reimbursement rate or category of service for institutional billing, long-term care, or home health care.
• Recurring Monthly Income: Under standard national financial definitions, codes 23–24 can designate recurring monthly income values for specific state-level Medicaid eligibility calculations.

How It Is Used on Claims

• The Code: You enter 24 in the designated Value Code field on the institutional claim form.
• The Amount: The corresponding value amount field is populated with the specific 4-digit state rate code (rather than a dollar amount, depending on the state program specifications).

Michigan Medicaid denial code CO-24 means that the billed charges are already covered under a capitation agreement or a managed care plan.

What This Means

• Capitation Model: The insurance plan pays the provider a set, fixed monthly amount for the patient, regardless of how many services they use.
• Duplicate Billing: The system rejects the fee-for-service claim because the service is already included in that pre-paid monthly structure.
• Contractual Obligation (CO): The "CO" prefix means it is a contractual adjustment. You cannot bill the patient for this denied amount.

How to Handle It

• Check Eligibility: Look up the patient's enrollment details in the Michigan CHAMPS portal to confirm which managed care plan they belonged to on the date of service.
• Bill the Correct Payer: Submit the claim or encounter data to the patient's active managed care organization instead of standard fee-for-service Medicaid.
• Write Off: If the service is fully bundled under your capitation contract, treat the charge as a contractual write-off.

Occurrence code 24 on Medicare claims represents the date of a denial by a previous primary payer, typically used when filing for a Medicare Secondary Payer (MSP) conditional payment.

Key Details

• Purpose: It tells Medicare the exact date that another insurance company or primary payer denied coverage.
• When to Use: Providers use this code alongside a value code (such as Value Code 14) when submitting a secondary or conditional payment claim after the primary insurer has refused payment.
• Distinction: This code marks an event date and is separate from a CO 24 denial code, which is an adjustment reason code indicating a late claim submission or services covered under a capitation agreement.

Use Modifier 24 for an unrelated Evaluation and Management (E/M) service performed by the same physician or same group/specialty during a 10-day or 90-day global post-operative period.

When to Use Modifier 24

• New, Unrelated Problems: The patient presents with a completely different condition or separate diagnosis code (ICD-10) that is unrelated to the original surgery.
• Underlying Condition Management: The visit is exclusively to treat the underlying condition that prompted the surgery, rather than routine post-operative care (e.g., managing chemotherapy or immunosuppressant therapy).
• Different Anatomical Site: The problem occurs at a completely different anatomical site, even if the same diagnosis code is used.
• Timing: The service occurs beginning the day after the procedure through the end of the global period.

When NOT to Use Modifier 24

• Same-Day Services: Never use it for services rendered on the same day as the procedure—use Modifier 25 instead.
• Surgical Complications: Do not use it for infections, wound treatments, pain control at the surgical site, or suture removals, as these are bundled into the global surgical package.
• Non-E/M Codes: Do not append it to procedures, labs, X-rays, or supplies; it applies exclusively to E/M and general ophthalmological examination codes.
• Outside Global Period: Do not use it if the visit falls outside the 10-day or 90-day post-operative window.

For more official guidance on proper billing criteria, visit Novitas Solutions or check updates via the AAPC Knowledge Center.