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