Entity Code in Medical Billing: Definition, Use and Importance

Entity code in medical billing is a standardized identifier used to specify the role and identity of each entity in a medical claim. The entity codes determine whether an individual or organization in the medical claim represents the patient, provider, or the payer. 

 

Entity codes are used throughout the medical billing workflow to define patient and subscriber relationship, entity matching, entity role assignment, and clinical to financial mapping. The entity codes in medical billing are used to enable the insurance companies to accurately process and adjudicate claims.

 

Entity codes play a vital role in ensuring efficient billing by preventing errors caused by incorrect entity roles. Entity codes link medical services to the correct healthcare provider and insurance payer, supporting clean claim submissions and improving workflow efficiency of the healthcare practice.

What is an Entity Code in Medical Billing?

An entity code is a standardized two-character numeric or alphanumeric identifier in medical billing, used in electronic transactions (EDI 837 format). Entity code helps identify the specific role of an individual or organization (e.g. healthcare providers, insurance payers, and the patients) involved in a claim. For example, “PR” represents payer on 837 files. 

Entity codes are used to maintain clarity between clearinghouses and the payer systems so they understand who the medical claim data is referring to.

 

What are the Common Types of Entity Codes?

 

Following are some of the most common types of entity codes:

Provider Entity Codes

The provider entity codes are used to identify healthcare facilities or professionals that deliver medical care to the patients.

• Billing Provider (85)

The billing provider is the organization that submits the claim and receives payment from the insurance companies. The billing provider is usually a clinic, hospital or a medical practice responsible for medical billing.

• Rendering Provider (82)

The rendering provider is the healthcare professional who actually performs the medical care like doctors or healthcare specialists.

• Referring Provider (DN)

The referring provider is the physician who refers the patient to another healthcare professional for specialized care.

• Attending Provider (72)

The attending provider is the doctor who oversees the entire course of treatment of a patient and makes final medical decisions for them. Attending providers have final responsibility for a patient’s diagnosis and treatment.

• Supervising Provider (DQ)

A supervising provider is a physician who oversees other providers like residents and interns. Supervising providers do not always treat the patient directly.

Patient and Subscriber Entity Codes

• Patient (QC)

The patient is an individual who receives healthcare services from a provider.

• Subscriber (IL)

A subscriber is the person who holds the insurance policy. The subscriber is not always the same as the patient.

Organizational Entity Codes

• Payer (PR)

The payer is an insurance company responsible for reimbursing the medical claim to the healthcare providers.

• Payee (PE)

The payee is an entity that receives the payment from the insurance companies. Payees are sometimes different from the billing provider.

• Service Location (77)

The service location identifies the physical place where the healthcare services were performed.

 

What is an Entity ID Number?

An Entity Identification Number is a unique code assigned to a specific individual or organization within a particular setting. For example, NPI for a provider and member ID for a patient to identify the exact entity. In medical billing, the Entity ID number refers to the identifiers assigned to the patients, healthcare providers, healthcare organizations, and the insurance companies.

 

The Entity ID number ensures accuracy in claim processing by avoiding identity confusions.

Are Entity Codes Used Only in the 837 Claim Format?

No, entity codes are not limited to the 837 claim format. Even though the entity codes are used to define roles mostly in the 837 claim format, they are widely used throughout the revenue cycle process. 

The entity codes are used in multiple electronic transactions like Electronic Remittance Advice (ERA) and Prior Authorization requests or even paper claims.

How are Entity Codes structured in ANSI X12 837 Claim Transactions?

The entity codes in ANSI X12 837 claim transactions follow a federally regulated structural and hierarchical format. The ANSI X12 837 set consists of segments, hierarchy and types to define the identity and purpose of an entity in a claim.

Entity Code Segments

In ANSI X12 837, a segment is the basic structural unit of an electronic claim. Each segment represents a specific category of information like patient demographics, provider details, services performed, or claim data.

Entity Code Hierarchy

Hierarchy refers to the structured bridge between entities using loops within the claim. The ANSI X12 837 transaction follows a top-down loop structure:

1. Healthcare billing provider (Loop 2010AA)

The provider or organization that submits the claim and receives payment from the insurance companies.

1. Pay-to Provider (Loop 2010AB)

The entity that receives payment from the insurance companies, other than the billing provider.

1. Subscriber (Loop2010BA)

The insured individual who holds the insurance policy under which the claim is filed. The subscriber is sometimes also a patient.

1. Patient (Loop2010CA)

The person who actually receives the medical services from the healthcare provider.

1. Rendering Provider (Loop 2310B)

The healthcare provider who performed the medical service or treatment on the patient.

1. Service Line (Loop 2400)

The detailed entry of a billable service provided in the medical claim.

Entity Code Types

In ANSI X12 837, type refers to the classification of entities and identifiers within segments. The types section determines the type of entity, whether it is an individual or an organization, and the kind of identifier like NPI, TIN, or payer-specific IDs.

 

How are Entity Codes used in Medical Billing Workflows?

 

Entity codes in medical billing workflows are used to identify and organize entities involved in a medical claim for accuracy:

Patient Registration – Entity Identification

Entity codes are assigned in the patient registration step to define the patient and subscriber relationship. Entity identification ensures the clarity between individuals receiving the medical claim and the one whose insurance coverage is used.

Insurance Eligibility – Entity Matching

Entity matching in the insurance eligibility step is used to match the patient, subscriber and payer entity. This step confirms the correct insurance entity that is responsible for the payment.

Provider Setup – Entity Role Assignment 

Each provider is assigned with a specific role like billing provider submits the claim, rendering provider performs the service, referring provider directs the care and supervising provider oversees the service. Entity codes in provider setup ensures that each provider is accurately identified by their role.

Charge Capture – Clinical to Financial Mapping

Clinical services of the healthcare providers are converted into financial billable data while entity codes are used to define the provider’s responsibility. Clinical to financial mapping helps ensure the charges are linked to the correct providers. 

Charge Entry – Entity Entry in Claim Data

Entity codes are entered into the claim records during the charge entry process. The claim data is prepared for the EDI format which builds the foundation of the electronic claim.

Claim Construction – 837 EDI Claim Formatting

Entity codes are placed in the respective loops and segments to ensure proper hierarchy in the 837 claim format.

Claim Scrubbing 

Errors like missing entity roles or invalid entity relationships are checked before submission to avoid rejection.

Claim Submission 

Entity-coded claim, using ANSI X12 837 rules, is sent to the insurance payer for clean electronic claim processing.

Payer Adjudication

Payers use entity codes to determine who is responsible for the service and the payment allocation rules. Entity codes in payer adjudication help the insurance payers make accurate payment decisions.

Denial Management

In case of errors, medical billers identify incorrect entity mapping and resubmits the claim by using correct entity structure. 

Auditing and Compliance

Entity codes in medical billing are regularly used to ensure compliance with 837 EDI standards to reduce systematic billing errors.

What are the Real-world Examples of Entity Code Usage in Claims?

Following are some real-world examples of entity code usage in claims:   

1. Subscriber Vs Patient

A 7 year old child visits a pediatrician with her mother. The mother uses her insurance policy for the daughter’s checkup. The entity codes for this situation are used as:

• Patient entity – Child (the one who received treatment)
• Subscriber entity – Mother (the one who is policy holder)

 

1. Doctor working in a Hospital

A cardiologist performs heart surgery at a hospital that owns multiple clinics. The entity codes in this scenario would be:

• Rendering provider – Cardiologist (the one who performed the surgery)
• Billing provider- Hospital group with multiple clinics (the one who submits claim and receives reimbursement)

 

1. Prescription Billing

A doctor prescribes antibiotics to the patient but the pharmacy dispenses those antibiotics. The entity codes in this situation would be used as:

• Prescriber entity – Doctor (the one who authorized medications)
• Pharmacy entity – Dispenser (the ones who submits medication claim)

What is the Role of Entity Code in the Revenue Cycle Management (RCM)?

Entity code performs following roles in healthcare revenue cycle management (RCM):

Identifying Entities in Claims

Entity codes are used to identify the parties involved in a medical claim such as healthcare provider, patient, insurance payer. Entity codes ensure that each entity is uniquely recognized in the system.

Assigning Billing Roles

Entity codes specify the responsibilities of each entity in the billing process like who provided the service (rendering provider), who submitted the claim (billing provider) and who holds the insurance policy (subscriber).

Standardizing 837 Data

Entity codes ensure that every medical claim information is structured and organized under the standardized format of ANSI X12 837 electronic claim. Standardizing the claim information helps healthcare entities communicate without confusion.

Ensuring Clean Claims

Ensuring clean claim submission is one of the most essential reasons for using entity codes. Entity codes help reduce the chances for claim rejection or denials by correctly identifying and linking each entity.

Maintaining Billing Accuracy

Entity codes help maintain consistency between crucial details like patient demographics, provider information, and insurance details. Entity codes help prevent mismatches in entity information, which leads to delays or denials.

Supporting RCM Workflows

Entity codes ensure a smooth flow of claim information in all the stages of a revenue cycle process, including charge entry, claim submission, denial management, and payment posting.

What are the Common Errors associated with Entity Code?

Some of the most common errors associated with entity code are:

“This code requires use of an entity code”

This type of error occurs when the claim includes some data information but does not specify which entity the data is written for. One of the many examples for this kind of error is when the medical biller enters a provider NPI but does not specify whether it belongs to the billing provider or rendering provider.

 

The use of the correct entity qualifier to ensure each identifier is mapped to the correct entity role helps prevent errors. Using claim scrubbing tools before submission is one of the few ways to prevent the errors related to entity code.

Incorrect Entity Assignment

Incorrect entity assignment happens when the entities are set up incorrectly in the billing system. One of the many examples for this error is when a provider is marked as a billing provider instead of rendering provider. The impact of these errors becomes visible when the claim is processed under the wrong role, leading to claim rejections or incorrect payment.

 

One of the most common ways to avoid incorrect entity assignment is the usage of predefined role templates and the configuration of entity roles correctly in the billing system. Periodic audits also help with the correct entity assignment in the billing system.

Patient–Subscriber Data Inconsistencies

The patient and subscriber data inconsistencies occur when the subscriber’s record does not align with the patient’s information in the claim. The data inconsistencies mostly happen when the insurance information is outdated or because of the registration errors. It mainly leads to incorrect eligibility checks which result in claim denials. 

 

Verifying the insurance details during registration and using real-time eligibility verification tools helps the medical billers avoid inconsistencies in the patient-subscriber data.

Inaccurate Provider Information

When the provider’s information or details are outdated or incorrect, it causes a daly in the adjudication or mostly claims rejection. Inaccurate provider information is mostly a result of data entry mistakes or outdated provider registry.

 

The best way to maintain accuracy is keeping an updated healthcare provider master database along with the use of system auto-fill features to reduce manual errors. Validation of National Provider Identifier (NPI) from the official registry keeps the provider details up-to-date and accurate.

Incomplete Entity Data Error

Incomplete entity data error occurs when the required entity fields like subscriber ID, payer address, or provider identifier are missing during entry. The claims with incomplete entity data are unable to process further in the Revenue Cycle Management (RCM) cycle causing claim rejections.

 

The use of claim scrubbing tools before claim submission helps the billing staff maintain complete entity data. Regular staff training on required entity data helps reduce the chances for errors.

Duplicate Entity Records

The duplicate entity record refers to the error when the same entity is entered more than once in the billing system. Duplicate entry causes confusion in the claim processing and errors in the payment posting, leading to claim rejections. 

 

Double checking the entity records and using unique identifiers like, NPI, helps prevent duplicate entity records error. Regular internal audits help identify duplicate records and merging them helps avoid errors related to duplicate entities.

Incorrect Payer Assignment

When the medical claim is sent to the wrong insurance payer, it leads to incorrect payer assignment error. This kind of error leads to claim rejection or delayed reimbursement from the insurance payer.

 

Verification of primary and secondary insurances and proper use of coordination of benefits (COB) rules helps file claims to the right insurer. Cross checking the payer ID before submission is also one of the most common ways to avoid incorrect payer assignment.

Errors in 837 EDI Formatting

When the entity data is incorrectly structured in 837 EDI segments, it leads to errors, causing claim rejections. The claims with 837 EDI formatting errors are rejected at clearinghouses and never reach the insurance payers.

 

The use of EDI compliant billing softwares and regular updates of EDI mapping rules helps prevent inconsistencies in the 837 EDI formatting.

What is Entity Code Rejection?

Entity code rejection is a type of claim rejection that occurs when the entity information in a medical claim is incorrect, missing, or improperly structured. Inconsistencies in the entity information makes it impossible for the clearinghouse to identify the involved parties.

 

Entity code rejection often leads to payment delays because the claim never reaches the processing stage. 

How to Resolve Entity Code Rejection?

To resolve entity code rejection, the medical biller needs to:

• Identify the exact rejection reason. The reason for rejection is often mentioned by the clearinghouses like invalid entity identifiers or this code requires use of an entity code.
• Verify and fix any incorrect or missing entity qualifiers in the medical claim.
• Make sure each ID is linked to the correct entity.
• Confirm the patient-subscriber relationship and correct any mismatches.
• Add any missing fields like name, address, identifier.
• Resubmit the corrected claim promptly.   

 

Assigning the correct entity qualifiers like patient, subscriber, and provider roles in the medical claim helps prevent entity code rejection. 

What are the Best Practices for Accurate Use of Entity Codes?

The best practices for accurate use of entity codes are:

Accurate Entity Identification

The use of consistent naming formats across billing systems helps prevent confusion related to the entity identification. Every party in the medical claim needs to be correctly identified by capturing accurate details for patients, subscriber, payer and healthcare provider.

Correct Assignment of Entity Roles

Each entity needs to be assigned with the correct role in the medical billing process. Distinguishing between billing provider, rendering provider, and referring provider is essential to avoid claim rejection. The use of proper entity qualifiers is one of the best practices for accurate use of entity codes.

Maintenance of Valid Identifiers

All the entity identifiers like NPI and taxonomy codes need to be valid and up-to-date. Verifying patient member IDs and payer IDs while removing inactive identifiers helps with the clean claim submissions.

Adherence to 837 EDI Structure

Placing entity data correctly within the claim format is the key to entity code usage accuracy. The use of correct loops and segments and ensuring proper hierarchy of the entities ensures correct accurate claim mapping and correct identification of provider roles.

Regular Audits and Quality Checks

Consistent monitoring of entity data accuracy and reviewing of rejection trends related to entity codes helps prevent incorrect entity mapping and ensure ongoing compliance with the 837 EDI standards.

How does Prime Doc Billing ensure Accurate Entity Code Usage and Reduce Claim Rejections?

Prime Doc Billing ensures accurate use of entity codes by implementing standardized workflow protocols and automated validation checks within the medical billing system. Our team assigns each entity correctly during data entry and verifies them during claim scrubbing. 

We perform regular audits and identify denial trends related to entity codes to help identify recurring issues and perform proactive corrections to improve first-pass acceptance rate.

 

Frequently Asked Questions

 

What is the difference between an entity code and a taxonomy code?

Entity code defines the role of a participant (provider, patient, payer) in the claim. 

Taxonomy code specifies the healthcare provider’s specialty or classification in the medical claim.

Can incorrect entity codes cause claim denials?

Yes, incorrect entity codes can cause claim rejections or denials. If a healthcare provider is assigned to the wrong role in case of incorrect entity codes, the insurance payers are unable to process the medical claim.

Where are entity codes located in an 837 claim file?

Entity codes are located within specific loops and segments in the 837 claim file to ensure proper claim structure and hierarchy.

How do clearinghouses handle entity code errors?

Clearinghouses detect invalid or missing entity codes and return the claims with error reports. The error reports allow the medical billers to perform corrections before resubmission.

Are entity codes required for all insurance claims?

Yes, entity codes are a compulsory requirement in electronic 837 EDI claims since they define the role and structure of entities within the claim.

What is an entity code on UB-04?

Entity codes on UB-04 define the identity and role of each identity in the claim. However, they are not labeled the same way as in EDI.

 

Reference:

Accredited Standards Committee X12. (2023). ANSI X12N 837 Health Care Claim: Professional Implementation Guide.