---
title: "How to Add a Clinical Trial Number to an Electronic Claim"
slug: "how-to-add-a-clinical-trial-number-to-an-electronic-claim"
updated: 2026-07-16T15:06:36Z
published: 2026-07-16T15:06:36Z
canonical: "docs.claim.md/how-to-add-a-clinical-trial-number-to-an-electronic-claim"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.claim.md/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Add a Clinical Trial Number to an Electronic Claim

# How to Add a Clinical Trial Number to an Electronic Claim

Electronic claims involving a clinical trial require the clinical trial number to be submitted in a specific location within the claim file.

The preferred method is for your billing software to send the clinical trial number in **Loop 2300, REF*P4**. If your billing software cannot send the value in this field, you can enter it in the claim narrative using the format described below. Claim.MD will then place the clinical trial number in the appropriate field on the outbound claim.

Preferred Submission MethodYour billing software should send the clinical trial number in **Loop 2300, REF*P4** whenever that option is available.

## Requirements

The following conditions must be met for Claim.MD to identify the clinical trial number in the narrative and send it in the correct outbound field:

| Requirement | Details |
| --- | --- |
| **Diagnosis code** | The claim must include a **V707** or **Z006** diagnosis code. |
| **Narrative entry** | The clinical trial number must be entered in the claim-level narrative field. |
| **Required format** | Enter the clinical trial number, followed by one space and the letters **CT**. |

ImportantThe qualifying diagnosis code and the required narrative format must both be present. Claim.MD may not recognize and move the clinical trial number to **REF*P4** if either requirement is missing.

## Enter the Clinical Trial Number

1. Open the claim in your billing software or Claim.MD.
2. Confirm that the claim includes a **V707** (ICD-9) or **Z006** (ICD-10) diagnosis code.
3. Locate the claim-level **Narrative** field.
4. Enter the clinical trial number.
5. Enter one space after the number, followed by the uppercase letters **CT**.
6. Save or submit the claim.

![](https://cdn.document360.io/367e6528-88da-4443-9da1-fcdd7e6d4d49/Images/Documentation/image-1784214391146.png)

## Formatting Example

For a clinical trial number of **12345678**, enter the following in the narrative field:

**Correct narrative entry:**12345678 CT

The entry must include:

- The complete clinical trial number
- One space after the number
- The uppercase letters **CT**

How Claim.MD Processes the ValueWhen the required diagnosis code and narrative format are present, Claim.MD identifies the clinical trial number and sends it in **Loop 2300, REF*P4** on the outbound electronic claim.

## Before Submitting the Claim

Verify that:

- The claim includes a **V707** or **Z006** diagnosis code.
- The clinical trial number is accurate.
- The number is followed by one space and **CT**.
- No additional characters or punctuation appear between the clinical trial number and **CT**.