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Denial Code 13

Definition:

The patient's recorded date of death is before the date of service.

What is Denial Code 13?

Denial Code 13 means the payer's records show that the patient died before the date on which the billed service was provided.

For example, if the payer shows a date of death of June 10 but the claim reports a service on June 15, the payer may deny the claim because the dates appear inconsistent.

This denial commonly results from an incorrect date of service, incorrect date of death, patient-selection error, or outdated payer information.

Example 1#
Scenario:

A patient receives an outpatient cardiology follow-up visit, CPT 99214, on April 10, 2026.

The patient later passes away on July 15, 2026. During manual charge entry, biller accidentally enters the date of service as October 4, 2026 instead of April 10.

Medicare compares the submitted October service date with the beneficiary's July date of death and denies the claim with Denial Code 13.

Let's break down the issue:
  • Denial Code 13 means the payer has a date of death that occurs before the date of service reported on the claim.
  • The patient truly received the cardiology service while alive on April 10.
  • The payer's date of death is also correct.
  • The error is entirely on the claim: the billing office entered October 4 instead of April 10.
  • Because October 4 occurs after the patient's July 15 death, Medicare's system correctly rejects the submitted service date.
  • No diagnosis change, modifier, or medical-necessity appeal is needed in this situation.
Resolution:
Review the signed physician note and other encounter records to verify that the service actually occurred on April 10, 2026. Correct the date of service from October 4 to April 10 and submit the appropriate corrected claim or reopening request according to the Medicare Administrative Contractor's instructions. Do not alter the patient's correct date of death.
Example 2#
Scenario:

A DME supplier provides a home oxygen concentrator under HCPCS E1390 on a monthly rental basis.

The beneficiary passes away on May 12, 2026. The supplier's recurring billing system is not updated and automatically generates another monthly rental claim with a June service date.

The June oxygen-equipment claim is submitted to a Medicare Advantage payer. Because the entire billed service date occurs after the patient's recorded date of death, the payer denies the claim with Denial Code 13.

Let's break down the issue:
  • This is not a data-entry error involving the patient's date of death.
  • A patient who was renting an oxygen concentrator died on May 12, 2026.
  • The medical supply company’s computer system didn't get updated, so it automatically billed insurance for the next month (June).
  • Insurance denied because the patient had already passed away before June even started, the insurance company (Medicare Advantage) rejected the June bill using Denial Code 13 (which means "patient is deceased").
  • HCPCS E1390 is an oxygen-equipment code paid under monthly rental methodology.
  • Oxygen equipment is billed on a monthly flat rate, not a daily rate. The original draft of this policy mistakenly suggested cutting the prior month's (May) bill down to a daily rate up to the exact date of death, which is incorrect for this type of equipment.
Resolution:
To resolve this issue, immediately cancel and void the unsupported June claim, and do not attempt to appeal the insurance denial. Turn off the automatic monthly billing for this patient right away to prevent future erroneous claims, and document the exact date the company was officially notified of the death. You should also coordinate with the patient's family or estate to physically retrieve the rented oxygen concentrator. Finally, leave the May billing intact as a full-month charge rather than cutting it down to a 12-day daily rate; because oxygen is billed under a monthly flat-rate methodology, the full payment was legally earned when the billing cycle triggered while the patient was still alive.
Example 3#
Scenario:

A living patient undergoes medically necessary surgery and continues to attend postoperative therapy appointments.

However, UnitedHealthcare's enrollment system unexpectedly shows that the patient died several months before the surgery.

UHC denies the surgery with Denial Code 13 and remark code N330.

Remark Code N330: "Missing/incomplete/invalid patient death date."

Let's break down the issue:
  • The patient is alive, so the medical service itself is not actually post-mortem.
  • The problem exists in an enrollment or external demographic record showing an incorrect death status or date.
  • RARC N330 specifically identifies a problem with the patient death date.
  • Before assuming Social Security caused the error, determine where the payer obtained its death information.
  • If the payer's own enrollment record is wrong, the correction may need to be handled directly through the payer's Member/Enrollment Operations department.
  • If Social Security's record itself incorrectly shows the individual as deceased, the patient must correct the SSA record rather than repeatedly submitting claims.
  • Sending the same surgery claim again without correcting the underlying death record will normally reproduce the same CARC Code 13 denial.
Resolution:
First verify exactly where the incorrect death information exists. If UnitedHealthcare's own enrollment file is wrong, have the member correct the information through the payer's enrollment process and then request claim reprocessing. If Social Security also incorrectly lists the patient as deceased, the patient should contact or visit a local SSA office with acceptable current original identification and request correction of the erroneous death record. After SSA corrects the record, it can provide an Erroneous Death Case – Third Party Contact Notice that may be shared with the insurer. Once the payer removes the incorrect death flag, request re-adjudication of the original claim.

Why Does Denial Code 13 Occur?

  1. The date of service was entered incorrectly.
  2. The payer has an incorrect date of death in its records.
  3. The wrong patient's information was used on the claim.
  4. A service performed before death was accidentally billed with a later date.
  5. The provider's system contains incorrect patient demographic information.
  6. The payer's eligibility or enrollment records were updated incorrectly.

How to Avoid / Ways to Mitigate Denial Code 13?

  1. Verify the Date of Service: Compare the claim with the medical record to make sure the correct service date was reported.
  2. Verify Patient Information: Make sure the claim was created for the correct patient and patient account.
  3. Check Payer Records: If the payer has an incorrect date of death, determine what information is required to correct its records.
  4. Correct Claim Errors: If an incorrect date of service was billed, correct the date according to the medical record and follow the payer's corrected-claim process.
  5. Do Not Change Valid Dates: Never change a legitimate date of service simply to bypass the denial. All dates must match the medical record.
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