UB04 Type of Bill Code 0113: Hospital Inpatient (Including Medicare Part A) - Interim - Continuing Claim

Overview

The UB-04 Type of Bill code 0113 is a four-digit alphanumeric code used to identify a claim as a Hospital Inpatient (Including Medicare Part A) – Interim – Continuing Claim. The code structure begins with a leading zero that is ignored by CMS, followed by three digits that convey facility type, care type, and frequency ^[1]. The second digit “1” indicates the facility is a Hospital. The third digit “1” specifies Inpatient Part A (except Clinics) ^[1]. The fourth digit “3” denotes Interim – Continuing Claims, meaning the claim is not the first or last in a series of interim bills for an ongoing inpatient stay ^[1]. Providers such as acute inpatient hospitals must use the UB-04 claim form when submitting paper claims to payers like MassHealth ^[2].

When to Use

This code is appropriate for any subsequent interim bill after the first interim claim and before the final interim claim (frequency “4”). It is not used for the first claim in a series (which would be code 0112) or for the last claim before discharge (code 0114) ^[1]. Hospitals that are licensed as acute inpatient facilities and participate in Medicare Part A must apply this code when billing for ongoing inpatient stays that span multiple billing cycles ^[2]. It is critical to use the correct frequency digit to avoid claim rejections or payment delays. Providers should verify that the patient remains an inpatient and that no discharge has occurred before submitting a continuing interim claim.

Step-by-Step Claim Example

Consider a patient admitted to an acute inpatient hospital on January 1, 2025, for a Medicare Part A covered stay. The hospital submits the first interim claim on January 15 using Type of Bill 0112 (Interim – First Claim). The patient remains hospitalized, so on January 31 the hospital needs to submit a second interim bill for the period January 16–31. The hospital completes the UB-04 form with the following key fields: Field 4 (Type of Bill) = 0113; Field 6 (Statement Covers Period) = From 01/16/2025 Through 01/31/2025; Field 8a (Patient Name) = John Doe; Field 9a (Patient Address) = 123 Main St; Field 10 (Birth Date) = 01/01/1950; Field 11 (Sex) = M; Field 12 (Admission Date) = 01/01/2025; Field 13 (Admission Hour) = 10; Field 14 (Type of Admission) = 1 (Emergency); Field 15 (Source of Admission) = 4 (Physician Referral); Field 16 (Discharge Hour) = left blank (patient not discharged); Field 17 (Patient Discharge Status) = left blank or 30 (Still Patient); Field 31–34 (Revenue Codes, HCPCS, Service Dates, Units) list charges for the period. The hospital attaches supporting documentation as required by the payer. After submission, the claim is processed as a continuing interim bill, and the provider receives payment for the covered days. When the patient is discharged on February 5, the hospital submits a final interim claim using Type of Bill 0114 (Interim – Last Claim) for the period February 1–5 ^[1]. This example demonstrates the correct sequencing of interim claims.

Common Mistakes & Audit Red Flags

One common mistake is using code 0113 for the first interim claim instead of 0112. The frequency digit “3” is specifically for continuing claims, not the initial interim bill ^[1]. Another error is submitting code 0113 after the patient has been discharged; the correct code for the final interim claim is 0114. Using the wrong frequency digit can cause the claim to be rejected or paid incorrectly. Providers may also inadvertently use code 0113 for outpatient or Part B services, but the third digit “1” limits this code to Inpatient Part A only ^[1]. Audit red flags include submitting multiple 0113 claims with overlapping statement periods, which may indicate duplicate billing or incorrect date ranges. Payers may also scrutinize claims where the number of interim claims seems excessive relative to the length of stay. Another red flag is using code 0113 when the patient’s admission type or source does not align with inpatient Part A coverage (e.g., observation status). Providers should ensure that the patient’s inpatient status is documented and that the claim includes accurate revenue codes and charges for the interim period. Failure to follow the correct sequence (first, continuing, last) can lead to payment delays or denials. Always verify that the claim is not a late charge only (frequency “5”) or a replacement (frequency “7”) when using 0113 ^[1].

Related Codes/Fields

The table below lists related Type of Bill codes and fields that are commonly used alongside or instead of 0113. All definitions are derived from the Noridian Bill Types source.

Code/Field	Description	Relationship to 0113
0111	Hospital Inpatient Part A – Admit Through Discharge	Used for a single claim covering the entire stay; not interim.
0112	Hospital Inpatient Part A – Interim – First Claim	Precedes 0113; the initial interim bill in a series.
0114	Hospital Inpatient Part A – Interim – Last Claim	Follows 0113; the final interim bill before discharge.
0115	Hospital Inpatient Part A – Late Charge Only	Used to bill for charges missed on a prior claim.
0117	Hospital Inpatient Part A – Replacement of Prior Claim	Replaces a previously submitted claim (any frequency).
0118	Hospital Inpatient Part A – Void/Cancel of Prior Claim	Cancels a prior claim entirely.
Field 6 (Statement Covers Period)	Dates of service for the interim period	Must align with the frequency digit; for 0113, dates should not include the first or last day of the entire stay.
Field 12 (Admission Date)	Date of inpatient admission	Should remain the same across all interim claims for the same stay.
Field 17 (Patient Discharge Status)	Discharge status code	Should be left blank or set to “30” (Still Patient) for 0113; updated on final claim.

All codes listed above are defined in the Noridian Bill Types source ^[1]. Providers should reference the full bill type table for additional frequency codes (e.g., “A” through “Z”) that may apply to hospice or other special situations.

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References

[1] Noridian Bill Types — https://med.noridianmedicare.com/web/jea/topics/claim-submission/bill-types

[2] MassHealth UB-04 Guide — https://www.mass.gov/doc/ub-04-billing-guide-0/download