Medical billing automation: which steps to automate, and what still needs a biller

Medical billing automation uses software for the routine steps that get a claim paid, from checking coverage to posting the payment. Most of those steps already run electronically, and health plans receive 98% of claims that way. The least electronic steps are the ones that carry documents. These include paper remittances, faxed records and prior authorization letters. Software that reads and checks those documents lets billers handle only the ones that fail a check.

Below, we match each billing step to the software that automates it. Then we take one faxed remittance through the checks, claim by claim.

Which billing steps already run electronically

Medical billing runs on a set of standard electronic transactions. Under HIPAA, HHS adopted a standard format for most of these steps. For medical claims, those formats are X12 transactions. Your billing system and clearinghouse send and receive them without anyone retyping data. Each year the CAQH Index asks health plans and providers how much of this work they do fully electronically. The 2025 edition, produced with Wipro as thought partner, covers 2024.

Shares are medical plans' 2024 figures from the 2025 CAQH Index. Formats are from the 2024 CAQH Index.

The shares are lowest for the steps that need documents, such as medical records or letters. CAQH defines an attachment as extra information sent with a claim, an appeal or a prior authorization request. Medical records that explain why a service was needed are one example. Attachments and remittance advice were the only medical transactions whose electronic share fell in 2024.

A low share doesn't always mean a large cost. The 2024 CAQH Index, which covers 2023, estimated what the medical industry could save if every step were fully electronic. Eligibility and benefit checks made up $11.7 billion of the $18.4 billion total. Most of that saving would come from checks that staff do on payer portals or by phone. Remittance advice came to $695 million, prior authorization to $515 million and attachments to $71 million.

Many denials start with the documents in the table above. In Optum's analysis of about 124 million hospital claim remits from 2023, problems with registration and eligibility caused 24.33% of denials. Requests for medical documentation caused another 12.08%. The data comes from claims that went through Optum's own clearinghouse and revenue cycle services. Registration data comes from the insurance card and the intake form, so those documents need checking too. Our guide to health insurance claim form data extraction covers the CMS-1500 and UB-04 claims that still arrive on paper.

What AI does in medical billing, job by job

AI in medical billing covers several kinds of software, each built for a different job. CAQH found that more than half of health plans and a quarter of providers now use AI. Providers use it mostly for administrative tasks such as eligibility checks and note-taking. Pick a tool by the job your team wants to hand off.

Why paper remittances still cost billers time

A remittance tells the provider what a health plan paid on each claim and why it didn't pay the rest. CMS says a Medicare remittance usually covers several claims, and one check or EFT pays for all of them. It lists every adjustment with a reason code and an amount.

When a remittance arrives as an X12 835 file, the billing system can post it automatically. CMS says that saves the staff time it takes to post a paper remittance by hand. In 2024, 13% of remittance advice at health plans wasn't fully electronic. It went through payer portals or manual channels such as mail and fax. CAQH puts a manual remittance at 9 minutes of provider staff time, against 5 minutes for an electronic one, in its 2023 data.

Two more problems follow. CAQH notes that teams who use both payer portals and electronic remittances can post the same payment twice. And a claim to a secondary plan includes what the primary plan paid, so a misread EOB puts a wrong amount on that claim.

One faxed remittance, checked claim by claim

Take a faxed remittance from a health plan to a family practice. It covers three claims, and one EFT of $194.80 pays for all of them. The plan also takes back $45.00 it overpaid on an earlier claim. The software gives each value it reads a confidence score, which shows how sure it is of the reading.

Only one value needs a person. The biller opens claim 3's total, sees the line it came from on the fax, and changes it to 136.80. The claim payments then match the EFT, and the remittance can post.

Docsumo turns paper EOBs into 835 files. That's the standard format billing systems use to post electronic remittances.

Checks to run before a payment posts

Run these on every remittance that arrives on paper or as a PDF, before it posts.

• The claim matches one you sentPatient, claim number, dates of service and billed amount match an open claim in your billing system.
• Each line adds upThe paid amount, the patient's share and the other adjustments add up to the billed amount. The adjustments should explain every dollar the plan didn't pay.
• The patient's share is rightAmounts marked PR are the patient's to pay. Amounts marked CO, for contractual obligation, are the provider's to write off. CMS lets a provider bill a Medicare patient only for amounts marked PR.
• The claims add up to the paymentThe claim payments, less any provider-level adjustments, equal the check or EFT amount.
• It hasn't been posted alreadyThe same payment didn't come in earlier through a payer portal or an 835 file.
• Unsure values wait for a personAny value read below your confidence threshold goes to a biller before anything posts.

In Docsumo, you set up checks like these as steps in the workflow. A step can be an AI step or a few lines of your own Python code. Checking a claim against your open claims uses master data lookup. Checking one document against another is cross-document validation. Both are on the Enterprise plan.

How exceptions should reach a biller

A fax or a scanned mail batch can hold several documents, such as remittances, denial letters and records requests. The batch has to be split and sorted before anything can be read.

Docsumo sorts a batch into its documents. You name the document types you want, with no training set, and AI Split takes a plain-English definition of each one. Documents it can't classify wait as Unclassified for a person to assign. Document classification and splitting are on the Business plan.

Documents that pass every check go on to your billing system without anyone opening them. The rest wait in a review queue. You set a confidence threshold for each field, and a value read below it goes to a person. Clicking the field highlights the line it came from on the page, and each correction improves the model.

Our take. Billing automation works when billers can predict what will reach them. A remittance that passes every check should post with no one opening it. One that fails should arrive with the reason and the line on the page, so the biller fixes one value instead of re-keying the page. If billers can't tell why a document is in their queue, they start checking everything again, and the time savings disappear.

How to tell if billing automation is working

Count the documents a biller had to open, not the ones the software read. Put in your own numbers below.

If you don't track minutes per document yet, change the 6 minutes in the calculator to CAQH's 9 minutes for a manual remittance. Docsumo reports 95%+ straight-through processing. Your own rate depends on your payers' layouts and the checks you set. Our guide to straight-through processing shows how to raise it.

What Docsumo does in a billing office

Docsumo is an intelligent document processing (IDP) platform. It reads remittances and EOBs, CMS-1500 and UB-04 claim forms, prior authorization and referral forms, intake forms, member cards and medical records. It reads handwritten text too. Documents come in by email, upload or the API. Checked data goes to your billing, practice management or EHR system through the API and webhooks.

A clearinghouse turns claims into standard transactions and forwards them to payers. Docsumo isn't a billing service or a clearinghouse, so claims still go out through your billing system. It reads the codes on each document, and choosing codes stays with your coders. A workflow step summarizes the medical records, and our guide to OCR for medical records explains how scanned records are read.

Docsumo is HIPAA compliant and SOC 2 Type 2 audited. It signs a business associate agreement (BAA) with customers who process protected health information, and your documents aren't used to train shared or third-party models. The security page has the details. Docsumo supplies the software, not a review team, so your own billers review the exceptions. The healthcare page shows one claim file with every document checked against the others.

Which documents should your billers still open?

Only the ones that fail a check, each with its reason. To get there, list what reached your team on paper, by fax or as a PDF last week. Next to each document type, write the check a biller runs on it today. Those checks become your rules, and the documents that fail them become the review queue.

Book a demo and bring a sample remittance, or start a free trial. Ask your account team for the BAA before you send protected health information.

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