MA25
A patient may not elect to change a hospice provider more than once in a benefit period.
MA26
Alert: Our records indicate that you were previously informed of this rule.
MA27
Missing/incomplete/invalid entitlement number or name shown on the claim.
Check the name and id of the patient with card copy.
MA28
Alert: Receipt of this notice by a physician or supplier who did not accept assignment is for information only and does not make the physician or supplier a party to the determination. No additional rights to appeal this decision, above those rights already provided for by regulation/instruction, are conferred by receipt of this notice.
MA31
Missing/incomplete/invalid beginning and ending dates of the period billed.
Check the DOS.
MA32
Missing/incomplete/invalid number of covered days
during the billing period.
MA34
Missing/incomplete/invalid number of coinsurance days during the billing period.
MA35
Missing/incomplete/invalid number of lifetime reserve days.
MA36
Missing/incomplete/invalid patient name.
Check the patient name
MA37
Missing/incomplete/invalid patient’s address.
Check the patient addrress.
MA39
Missing/incomplete/invalid gender.
Change the gender and rebill.
MA40
Missing/incomplete/invalid admission date.
All the hospital claims require admission date. Check it.
MA43
Missing/incomplete/invalid patient status.
Status is missing like student or employed.
Links are simillar denials and solutions
https://whatismedicalinsurancebilling.org/2009/06/denial-and-actions-co-b16.html
https://whatismedicalinsurancebilling.org/2009/02/medicare-remittance-review-part-4.html
https://whatismedicalinsurancebilling.org/2009/01/medicare-remittance-advice-and.html
https://whatismedicalinsurancebilling.org/2008/10/denials-and-action-lacks-of-information.html
https://whatismedicalinsurancebilling.org/2008/09/medicare-denial-and-action-enrolled-in.html