To indicate that a provider accepts assignment on the CMS-1500 claim form, an X is placed in the Yes box of Block: This step is required for clean claim submission in 2025. Medicare and other payers use this field to decide how the claim will be paid. If you skip this, you could delay payment or cause denials.
Why Block 27 Matters for Getting Paid
When providers accept assignment, they agree to take the allowed amount as full payment. As a result, patients only pay the part the insurance doesn’t cover. This helps avoid overcharging and keeps billing fair for everyone.
How to Fill Out Block 27
- Find Block 27 labeled “Accept Assignment?”
- Put an X in the “Yes” box if the provider agrees to follow the payer’s fee rules.
- Leave the “No” box blank. Never check both.
To Avoid Mistakes:
- Don’t leave it blank. Some payers treat blank as “No.”
- Don’t check both boxes. It causes errors.
- Make sure your software isn’t defaulting to “No.”
Medicare’s 2025 Assignment Policy
Medicare expects all in-network doctors to accept assignment. If Block 27 is missing or incorrect, Medicare may reject the claim. According to CMS rules, marking “Yes” is not optional. In fact, it is required for payment.
Simple Tips for Medical Billing Teams
- Double-check Block 27 before you submit claims.
- Set your billing software to mark “Yes” for in-network doctors.
- Train your team to check this during audits and reviews.
Want More Claim Success?
FAQs
What if I leave Block 27 empty?
The insurance company might reject your claim. To avoid this, always mark the “Yes” box when the doctor agrees to accept the plan’s allowed fee.
Do all doctors have to accept assignment?
No. But if they work with Medicare, they must accept assignment. Otherwise, the claim could be denied.
Should I complete Block 27 for private insurance?
Yes. Most private payers follow Medicare’s style. Therefore, it’s best to mark it clearly.
Conclusion
To indicate that a provider accepts assignment on the CMS-1500 claim form, an X is placed in the Yes box of Block: This tells the insurance payer how the doctor wants to be paid. In 2025, this small box plays a big role. If you want faster, cleaner claims — check it every time.