Outpatient to Inpatient 3-Day Window

General
Policy Number: GP-I-003

Last Updated: July 16, 2026

Description

Preadmission and preoperative services are often necessary to ensure the health and safety of a member before they undergo surgery or inpatient admission. A wide range of examinations and diagnostics may be considered preadmission or preoperative services, including, but not limited to X-ray, laboratory tests and EKGs.

Centers for Medicare and Medicaid Services (CMS)⁠ “Three-day window” rule considers these related preadmission and preoperative services incidental to the subsequent facilities admission or surgical payment.

CMS “Three‐day window” definition:

“Defined as three (3) days prior to and including the date the beneficiary is admitted as an inpatient. For example, if a beneficiary is admitted as an inpatient on Wednesday, then Sunday, Monday, Tuesday or Wednesday is part of the three‐day window. Under the payment window policy, a hospital (or an entity that is wholly owned or wholly operated by the hospital) must include on the claim for a beneficiary's inpatient stay, the diagnoses, procedures, and charges for all outpatient diagnostic services and admission-related outpatient nondiagnostic services that are furnished to the beneficiary during the 3-day payment window.” (Medicare Claims Processing Manual, Pub. 100-04, Chapter 12, Section 90.7 and 90.7.1)

Diagnostic services (including clinical diagnostic laboratory tests) provided to a beneficiary by the admitting hospital, or by an entity wholly owned or wholly operated by the admitting hospital (or by another entity under arrangements with the admitting hospital), within 3 days prior to and including the date of the beneficiary's admission are deemed to be inpatient services and included in the inpatient payment. (Medicare Claims Processing Manual, Pub. 100-04, Chapter 3, Section 40.3)

This policy applies to facility claims. Please refer to global allowance rules in the Bundling Guidelines policy for professional claims.

Policy

Blue Cross Blue Shield Nebraska will limit reimbursement for preadmission and preoperative services according to the criteria outlined in this policy.

Reimbursement Guidelines

Place of Service

  • Inpatient
    • Preadmission and preoperative services performed at the same hospital system with the same federal tax ID.
      • Within 72 hours – date of admission/surgery included
      • Not separately reimbursable, included in inpatient payment
  • Outpatient
    • Preoperative services performed at the same facility
      • Within 72 hours – date of surgery included
      • Separately reimbursable when included on surgical claim 
Rationale

Based on CMS guidance, preadmission and preoperative services performed by the admitting hospital within seventy-two (72) hours of inpatient admission, including the date of admission, are deemed to be included in the subsequent inpatient admission payment.

Billing and Coding

Applicable codes are for reference only and may not be all inclusive.

Revenue / Diagnosis Code Description
030X  Laboratory 
031X  Laboratory pathological 
032X Radiology diagnostic
033X
Radiology therapeutic
034X
Nuclear medicine
0350 - 0352, 0359
CT scan
040X
Other imaging services
0480 - 0483
Cardiology
061X
MRT
073X
EKG/ECG
074X
EEG
Z01.81X Encounter for preprocedural examinations
Z01.89
Encounter for other specified special examinations

References

Medicare Claims Processing Manual, Global Surgery

Application

This policy relates only to the services or supplies described herein. Please refer to the Member's Benefit Booklet for availability of benefits. Member's benefits may vary according to benefit design; therefore, member benefit language should be reviewed before applying the terms of this policy.

 

 

 

 

Blue Cross and Blue Shield of Nebraska is an independent licensee of the Blue Cross Blue Shield Association.