Ambetter: New Required Field on CMS-1500 Claim Form
By Ellen Terry


Ambetter from Superior HealthPlan, a plan available on the Affordable Care Act (ACA) health insurance exchange, has changed the status of box 18 on the CMS-1500 claim form from a conditional/optional field to a required one, effective July 1.

If you submit a claim for an inpatient professional service with a location (box 24B) value of 06, 08, 21, 31, 32, 51, 54, 55, 56, or 61, box 18 (“Hospitalization Dates Related to Current Services”) must have the date of admission in the “from” portion of this field, using the eight-digit month-day-year format (mm-dd-yyyy).

If this field is blank, the claim may be rejected or denied. If you know the “to” date (the patient’s discharge date), you can add it to box 18, but this is not required.

If you have questions, call Ambetter at (877) 687-1196.

Source: Ambetter  

The Texas Medical Association’s payment specialists continuously review health care payment plans’ newsletters and updates for items important to Texas physicians. Texas Medicine Today periodically publishes key excerpts from those newsletters that you might have missed.

If you have questions about billing and coding or payer policies, contact the specialists at paymentadvocacy[at]texmed[dot]org for help, or call the TMA Knowledge Center at (800) 880-7955. TMA members can use the TMA Reimbursement Review and Resolution Service (formerly known as the TMA Hassle Factor Log program) to help resolve insurance-related problems. Visit for more resources and information. 

Last Updated On

September 23, 2020

Originally Published On

April 18, 2019

Related Content


Ellen Terry

Project Manager, Client Services

(512) 370-1391

Ellen Terry has been writing, editing, and managing communication projects at TMA since 2000. She hails from Victoria, Texas; has a journalism degree from Texas State University; and loves to read great fiction. Ellen and her husband have two grown sons and a couple of cats.

More stories by Ellen Terry