How to Complete CMS 1500 Boxes 24-33: Billing Provider, Service Dates & Procedures

Navigating the CMS 1500 form is crucial for accurate medical billing. This comprehensive guide focuses on **how to complete CMS 1500 Boxes 24-33**, detailing essential fields such as service dates, procedure codes, diagnosis pointers, and critical **billing provider information**.

Table of Contents

Understanding the Bottom Section of the CMS 1500 Form: Boxes 24-33 Overview

The bottom section of the CMS 1500 form, encompassing boxes 24 through 33, is where the core service line item details and the **billing provider information** are entered. Accurate completion of these boxes, including **CMS 1500 Box 33**, is paramount for timely reimbursement and compliant claims processing.

Supplemental Information (Shaded Area Across 24A-24H)

In the shaded area across Fields 24A through 24H, enter supplemental information about the service rendered. This field is used for details not accommodated elsewhere but required by the payer. For example, you might enter a specific claim note, a prior authorization number, or specific details for an unusual circumstance here. If entering more than one item of information on a line, make sure each item begins with a qualifier and is separated by at least 1 blank space.

Box 24A – Date of Service (Required)

This box must list numeric dates of service in MM DD YYYY format.
If billing for a single day, complete only the “from” column.
If “from” and “to” dates are used, the service must be on consecutive days and provided no more than once per day.

Box 24B – Place of Service (Required)

Enter the two-digit Place of Service (POS) code indicating where the service was provided. These codes classify the type of location where health care services are furnished.
Official Place of Service codes can be found on the CMS website: CMS Place of Service Codes

Box 24C – Emergency Indicator (Optional)

If the service you provided was a result of an emergency, enter a “Y” for “yes” in this box for each line item.
For example, if a patient presented to an urgent care clinic with acute symptoms requiring immediate intervention, you would mark ‘Y’.
If this was not an emergent service, leave blank or enter an “N” for “nonemergent”.

Box 24D – Procedure Code, Modifiers, & Description (Required)

Enter the five-digit/character CPT or HCPCS code(s) for the specific service provided.
Modifiers: Optionally, enter up to four two-digit national modifiers that relate to this service. Modifiers provide additional information or context for the procedure code, such as indicating that a service was performed bilaterally or by a specific type of provider.
For procedure codes that indicate “unlisted” services (e.g., CPT code 99199 for unlisted special service), you must attach an operative/medical report. This report should thoroughly describe the service performed, including its necessity, extent, specific findings, and any time spent.

Box 24E – Diagnosis Pointer (Required)

Enter the one-digit diagnosis code reference number (pointer) as shown in box 21 to relate the date of service and the procedure performed to the primary diagnosis.
Do not enter the actual **ICD-10-CM** code here. The pointer links to the corresponding diagnosis in Box 21.

Box 24F – Total Charges (Required)

Enter the total usual and customary charge for each line item.
Do not list credits or use dashes.

Box 24G – Service Days or Units (Required)

Enter the number of days or units for each service as indicated in Box 24A.
Some services are billed by units (e.g., therapy units, anesthesia time) depending on the specific service provided.

Box 24J – Rendering Provider ID (Optional)

This box is typically used when clinics or group practices use a specific billing provider number in **Box 33 of the CMS 1500** form. It identifies the individual professional who rendered the service.
Shaded Area: Enter the six (6)- or nine (9)- digit provider number (e.g., state license number or other unique identifier) of the individual rendering the service, if required by the payer.
Non-shaded Area: Enter the ten-digit National Provider Identifier (NPI) of the rendering provider. This is often the most common entry in this box.
Clarifying the distinction between the rendering provider (who performed the service) and the billing provider (the entity submitting the claim) is critical for accurate claims.

Summary of Financial Details and Billing Entity Information: Boxes 26-33

Box 26 – Patient Account Number (Optional)

Enter your internal patient account number here.
This box allows up to twelve characters and is used for your practice’s internal tracking.
This number will appear on your Remittance Advice (RA).

Box 28 – Total Charge (Required)

Enter the total charge amount for all services listed in column 24F for this claim.
Each claim form is a separate document and is to be totaled as such.

Box 29 – Amount Paid (Optional)

Enter the total amount paid by any prior resource(s) (e.g., primary payer if this is a secondary claim).
Do not include write-offs or copayments in this box.

Box 30 – Balance Due (Required)

Enter the remaining balance due after considering prior payments.
The amount in Box 28 minus Box 29 must equal Box 30.

Box 33 – Billing Provider Information (Required)

Block 33 of the CMS-1500 claim requires entry of the name, address, and telephone number of the billing entity, which is the provider or organization requesting to be paid for the services rendered. Accurate completion of **Box 33 CMS 1500** is crucial as it identifies who is submitting the claim and where payment should be sent.

Box 33 (Top Section): Enter the full name, address, and telephone number of the billing provider (the entity responsible for submitting the claim).
Box 33a – NPI (Required): Enter the ten-digit National Provider Identifier (NPI) of the billing provider. This is the primary identifier for healthcare providers in standard transactions.
Box 33b – Other ID (Optional/Required by Payer): Enter any other required six (6)- or nine (9)-digit provider number of the billing provider, such as a state license number, taxonomy code (if required by the payer), or a specific payer ID.
Note: Non-medical services (e.g., certain transportation services) may not require an NPI in this box, depending on payer specifics.

Mastering **cms-1500 box 33** and the preceding service line details ensures claims are processed efficiently, reducing rejections and improving cash flow. This detailed guide covers the essential steps for filling out **box 33 in cms 1500** and other critical fields from 24-33.