What is an Entity Code in Medical Billing?

Every year, healthcare providers lose billions of dollars in revenue because of small mistakes in insurance claims. Oftentimes, these mistakes are easily preventable, yet incomplete knowledge and expertise hinder growth. 

Most billing teams pay attention to CPT codes, modifiers, and documentation, but they often miss entity codes in medical billing. These codes are minor, but they are one of the most significant parts of the insurance claims. 

That’s why we have created this detailed guide on entity codes in medical billing. We will discuss what they are, their types, and how you can prevent common errors that can cause claim denials. So, let’s start. 

Entities in Medical Billing

To understand the entity codes, we must first define what an “entity” actually means in medical billing and coding. To put it simply, an entity is any individual, organization, or party that is involved in the delivery, processing, or payment of healthcare services. In most cases, the following entities are involved in processing a claim:

• Patients: The individuals receiving medical care whose insurance coverage is being billed.
• Healthcare Providers: The physicians, specialists, nurses, and clinics responsible for delivering care.
• Facilities: The physical locations where services are rendered, such as hospitals, diagnostic centers, and laboratories.
• Insurance Payers: The organizations responsible for reimbursement, including government programs like Medicare and Medicaid, as well as private commercial insurers.
• Third-Party Billers: Outsourced medical billing companies that manage claim submissions on behalf of providers.

Each of these entities has a specific code that distinguishes it. If you get these codes wrong, your claims will be rejected. We know that incorrect CPT codes or modifiers trigger denials, but why are entity codes essential in medical billing? Well, to answer that, you need to understand how claims are processed.

Insurance claims are processed via Electronic Data Interchange (EDI). Within this system, healthcare claims are submitted using a specific format called the X12 837 transaction format. This is a standard HIPAA-compliant system, and all insurance claims from all providers are submitted in the same format. 

Names alone are insufficient for this format. It requires standardized codes to instantly recognize who is sending data, who is receiving it, and who is being discussed. Entity codes in medical billing serve the purpose of identification. 

Types of Entity Codes in Medical Billing

Entity codes in medical billing can be classified in various ways, depending on what you are looking at. On a higher level, these codes can be classified into the following categories:

Provider Entity Codes in Medical Billing 

The first category is Provider Entities. As the name suggests, these entities are used to identify the professionals and organizations delivering care. These provider entities in medical billing are determined by the National Provider Identifier (NPI) number. It is a 10-digit code and is issued to all healthcare providers by the Centers for Medicare and Medicaid Services (CMS). 

Another type of provider entity code is the Taxonomy codes. These are 10-character alphanumeric codes that categorize the type of provider, classification, and specialization (e.g., distinguishing a cardiologist from a dermatologist). 

Now, healthcare providers themselves can be of three types:

• Billing Provider: The entity submitting the claim to the payer to request payment. This is often a group practice or clinic.
• Rendering Provider: The specific individual who performed the medical service or procedure.
• Referring Provider: The physician who requested the service or referred the patient to a specialist.

We will explain how to distinguish between them at the end of this section. 

Patient Entity Codes in Medical Billing 

Identifying the patient correctly involves more than just a name; it consists of defining their relationship to the insurance policy.

• Subscriber: The individual who holds the insurance policy (sometimes referred to as the policyholder).
• Dependent: A patient who is covered under the subscriber’s plan, such as a spouse or child.
• Patient: The specific individual receiving the medical services.

A unique member ID is assigned by the insurance carrier to link the specific individual to their benefits package.

Payer Entity Codes in Medical Billing

Just as providers need identification, so do the organizations paying the bills. Payers are identified by government-provided payer IDs. 

Other Important Entity Codes in Medical Billing

Several other types of codes can be considered as entity codes in medical billing. The following are some:

• Tax Identification Number (TIN): Used by the IRS for tax administration, essential for linking payments to the correct business entity.
• Employer Identification Number (EIN): A specific type of TIN used for business entities.
• Health Insurance Claim Number (HICN): Traditionally used for Medicare beneficiaries to identify their coverage status.

In an insurance claim, you won’t find a field that says “Payer Entity Code” or “Patient Entity Code”. Instead, on an insurance form, the entities themselves are represented by two or three-digit identifiers. Here are the most commonly used identifiers or entity codes in medical billing:

Code	Description	Role in Billing
DN	Referring Provider	The physician who requested the service or referred the patient.
IL	Insured or Subscriber	Identifies the primary policyholder of the insurance plan.
PE	Payee	The entity to whom the payment should be sent.
PR	Payer	Identifies the insurance company or agency responsible for payment.
QC	Patient	Identifies the individual receiving medical care (often distinct from the subscriber).
40	Receiver	The entity receiving the transaction (usually the payer or clearinghouse).
82	Rendering Provider	The specific physician or healthcare professional who performed the service.
85	Billing Provider	The entity (group or individual) submitting the claim to be paid.

Common Entity Code Errors & Prevention Guidelines

In medical billing, entity code rejections are essentially “front-end” rejections. This means the claim is kicked back immediately by the clearinghouse or the payer’s gateway, often via a 277CA acknowledgment transaction. These rejections must be resolved before the claim can technically be considered “filed.”

Why Do Rejections Occur?

An entity code rejection usually happens for one of the three reasons:

• Missing Information: The code is simply absent from the required field in the EDI file.
• Invalid/Expired Information: The NPI or Tax ID associated with the entity code (e.g., code 85 for Billing Provider) is no longer active in the payer’s system.
• Mismatch: The entity code does not match the ID provided. For example, submitting a group NPI but tagging it with the entity code for an individual person.

Prevention Guidelines

To minimize these disruptions, practices should implement rigorous front-end auditing. Most modern practice management software allows for “claim scrubbing,” where rules are set to verify that the NPI used matches the entity type (Individual vs. Group) selected. It is also vital to keep your enrollment data updated with payers. If a physician leaves a group but the group continues to bill under their individual rendering code (82) attached to the group’s billing code (85) without proper linkage, rejections will follow.

These are some good ways to tackle entity code rejections. However, in our view, the best, easiest, and most beneficial option is to get outsourced medical billing and coding services from vendors like NeuraBill. These companies have the tech and the expertise to handle all kinds of billing errors. 

Final Thoughts

Entity codes in medical billing are vital but often neglected by billers. With this guide, you must now have an idea of how important it is to pay attention to minor details like entities. 

Make sure to double-verify the entity identifiers and codes before filing claims. By investing in prevention through verification, training, and technology, healthcare organizations can save significant time and money.

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