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Medical claims 101: What you need to know

Medical claims 101: What you need to know

Medical claims are some of the most valuable sources of data for healthcare organizations. All-payor claims contain detailed diagnosis and procedure information for any billable patient visit. Healthcare organizations can use this claims information to:

It can be difficult to do all this without fully understanding medical claims data. In this blog, we’ll help you learn the basics about medical claims: what they are, where they come from and what they mean.

What is a medical claim?

A medical claim is a bill that healthcare providers submit to a patient’s insurance provider. This bill contains unique medical codes detailing the care administered during a patient visit. The medical codes describe any service that a provider used to render care, including:

  • A diagnosis
  • A procedure
  • Medical supplies
  • Medical devices
  • Pharmaceuticals
  • Medical transportation

When a provider submits a claim, they include all relevant medical codes and the charges for that visit. Insurance providers, or payors, assess the medical codes to determine how they will reimburse a provider for their services. In a value-based care model, length of stay and 30-day readmissions impact provider reimbursements.

What information does a medical claims file contain?

Every medical claims file contains details specific to each patient and patient encounter. In a medical claims file, this information is split in two parts: the claim header and the claim detail.

Claim header

The claim header summarizes the most essential information in the claim. This includes confidential patient information like date of birth, gender and zip code. The claim header also contains details like:

Claim detail

The claim detail includes information about secondary diagnoses or procedures administered during an inpatient hospital stay. Each new claim detail, or service record, contains the following information:

What is a medical claims clearinghouse?

A medical claims clearinghouse is an electronic intermediary between healthcare providers and payors. Healthcare providers transmit their medical claims to a clearinghouse. Clearinghouses then scrub, standardize and screen medical claims before sending them to the payor.

This process helps mitigate errors in medical coding and reduces the time to receive provider reimbursement. If a claim contains medical coding errors or fails to meet formatting requirements, the payor could reject it. This means that the claim would be resubmitted, delaying provider reimbursement.

The service that clearinghouses provide is also beneficial for payors. Clearinghouses format medical claims data according to the unique requirements of each payer. Standardizing the data in this way helps payors streamline their medical billing process.


What is the medical billing process?

The medical billing process contains seven essential steps. These steps trace the entire claims journey from the moment a patient checks in at a healthcare facility, to the moment they receive a bill from their insurance provider.

a circle diagram depicting the medical billing process

Fig. 1 Illustration of the medical billing process. Circle diagram displays the seven-step process that a medical claim goes through. Illustration from The Definitive Approach to Healthcare Sales – 101: Codifying the Patient Journey.

Patient registration

Patient registration is the very first step in the medical billing process. Registration occurs when a patient gives their provider personal details and insurance information.

Insurance eligibility verification

After a patient has registered, the care provider must verify the patient’s insurance. This helps to confirm that the patient has adequate coverage for the care that they will receive. Verification helps care providers determine coverage and eligibility, and assess the following:

  • What the patient’s policy benefits are
  • Whether the patient has accumulated co-pay, deductible or out-of-pocket expenses
  • Whether the patient’s insurance provider requires pre-authorization

Medical coding

Medical coding is a critical step that occurs after care has been administered. Care providers transcribe their notes and other clinical documentation into standardized medical codes. Some of the most common medical coding systems include:

Care providers use these codes to describe which medical diagnoses, procedures, prescriptions and supplies they administered and why. The specificity of medical codes also helps providers describe the patient’s condition.

Charge entry

Charge entry is the last step before care providers submit their claim for payment. Providers or medical billing specialists list the charges that they expect to receive.

Claims transmission

Claims transmission is when claims are transferred from the care provider to the payor. In most cases, claims are first transmitted to a clearinghouse. The clearinghouse reviews and reformats medical claims before sending them to the payor.

In some cases, healthcare providers send medical claims directly to a payor. High-volume payors like Medicare or Medicaid may receive bills directly from providers. This helps to reduce the time that it takes to receive reimbursement.


Adjudication occurs once the payor has received a medical claim. The payor evaluates the claim, then decides whether the medical claim is valid and how much of the claim they will reimburse.

If the claim is accepted, the payor will issue provider reimbursement and charge the patient for any remaining amount. The payor may deny the claim if the patient has insufficient coverage or did not get pre-authorization for a service. If a payor denies a medical claim, the patient may have to submit an appeal to gain coverage for the care costs.

The payor may also reject a claim. This happens when the claim does not meet formatting requirements or contains an error in medical coding. Rejected medical claims can be resubmitted for payment once the errors have been corrected.

Patient statement

Patient statement is the final step in the medical billing process. Once the payor has reviewed a medical claim and agreed to pay a certain amount, they bill the patient for any remaining costs.

Learn more

If you’re ready to get hands-on access to medical claims data, provider profiles, and powerful analytics, schedule a free trial with our healthcare commercial intelligence platform.

Definitive Healthcare

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Definitive Healthcare

This blog was written by a former contributor at Definitive Healthcare. At Definitive Healthcare, our passion is to transform data, analytics and expertise into healthcare…

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