Hope this helps:
How do I appeal a claim that was denied?
For a denied claim (except in the case of an unnumbered Insured Mail article), you may appeal a decision by filing a written appeal focusing on the basis of the claim denial within 60 days of the date of the original decision to the following address:
St. Louis Accounting Service Center
Claim Appeals
PO Box 80143
St. Louis, MO 63180-0143
Note: For an unnumbered insured mail article, you must send the appeal to the Post Office™ where the claim was filed. That Post Office will forward your appeal to the manager of the Claims Appeals at the St. Louis ASC.
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How do I appeal a claim that was paid as a smaller amount?
For a check sent in an amount less than the insured amount, you may submit a check protest appeal by filing a written appeal within 60 days of the date of the check contact:
St. Louis Accounting Service Center
Check Protest
PO Box 80140
St. Louis, MO 63180-0140
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What information do I need to provide in order to file an appeal on a claim?
You should focus on the basis of the denial that was supplied by the St. Louis Accounting Service Center.
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If my claim is denied a second time, what is the next step?
A final appeal may be submitted to:
Consumer Advocate
Claims Appeals
475 L’Enfant Plaza SW RM 10433
Washington DC 20260-0433