A practical guide to completing Box 18: Hospitalization Dates accurately and consistently.

From our workflow: When reviewing Hospitalization Dates, we look at both the field itself and the related patient, insured, provider, and service-line data. Payers evaluate the claim as a connected record.

Report related inpatient admission and discharge dates when applicable.

An entry for Hospitalization Dates may be the right length and still be the wrong value. The surrounding coverage, provider, and service information has to support it.

General rule: Payer-specific instructions, contracts, program manuals, and current coding guidance can add to or override general form guidance. Verify requirements before submission.

Why this deserves a careful check

The payer does not read Hospitalization Dates in isolation. We compare it with the surrounding claim data before deciding the entry is ready.

If Hospitalization Dates fails an edit, verify the source and the payer rule before changing it. A guessed value can move the problem from rejection to denial.

A reliable way to enter the data

  1. Identify the person, organization, date, code, or identifier the field is asking for.
  2. Locate the source document: insurance card, eligibility response, clinical note, authorization, provider enrollment record, fee schedule, or payer remittance.
  3. Enter the value using the form’s structure and the payer’s required format.
  4. Compare it with related fields and service lines for consistency.
  5. Save evidence of the source and the final submitted claim.

Mistakes worth catching early

  • Using emergency-room arrival times.
  • Listing unrelated hospital stays.
  • Omitting discharge date when known.

Copying an old claim can save time only after the current facts are verified. Recheck Hospitalization Dates, especially when the payer, provider, or date of service has changed.

Final review

  • Confirm the stay relates to the billed service.
  • Use documented dates.
  • Check payer rules for current inpatient status.
  • Compare the completed claim with the clinical and billing record.
  • Confirm the receiving address or electronic route.
  • Keep a secure copy and proof of submission.

What the software should handle

For Hospitalization Dates, software should catch missing values and obvious conflicts while leaving coverage, coding, and documentation decisions to the user and current payer rules.

Apply this in software: For a workflow that keeps claim data reusable and reviewable, see the CMS-1500 paper and electronic filing options. Software can enforce format and consistency, but the source record and payer instructions still control the claim.
Privacy reminder: Use fictional data for training and printer tests. Claims contain protected information and should be stored, transmitted, printed, and destroyed through approved secure processes.

Written and reviewed by

1500Software Development Team

Covers the software, printing, validation, export, and troubleshooting steps described on this page.

1500Software Claims Review Team

Reviews field placement, provider roles, source records, and practical correction steps.

Reviewed July 26, 2026. Always follow the receiving payer’s current instructions and companion guide.

Source material

The sources below describe the national form or transaction framework. Check the payer’s current instructions before filing.