What a Medical Billing Company Actually Does

The cycle, end to end

People call it the revenue cycle. The work splits into the front end (before and at the visit), the middle (turning the visit into a claim) and the back end (getting paid). Most denials are born at the front end and discovered at the back end, which is why a billing company that only works the back end is fighting with one hand.

Eligibility and benefits checks

Before the visit, someone confirms the patient's coverage is active, the plan is the one on file, the service is covered, and what the patient will owe (copay, coinsurance, deductible). Eligibility is one of the HIPAA standard electronic transactions, so it can be checked automatically against most payers (CMS).

• What a billing company does: runs checks in batches before scheduled visits, flags inactive coverage or plan changes, and tells the front desk what to collect.
• What stays with you: collecting the right insurance card and demographic details at check-in. No automation fixes a wrong member ID.
• For uninsured or self-pay patients: providers must give a good faith estimate of expected charges on request or when services are scheduled at least three business days ahead (CMS; No Surprises Act). Ask whether your billing company produces these.

Prior authorizations

Many payers require approval before certain services. It's heavy work: physicians in the AMA's 2024 survey reported an average of 39 prior authorizations a week and 13 hours of physician and staff time on them (AMA).

Billing companies vary most here. Some file and track requests; others only check that an authorization exists before submitting the claim. Clinical justification still comes from your clinicians' notes. From 2026, CMS requires Medicare Advantage organizations and Medicaid and CHIP programs and plans to decide standard requests within 7 calendar days and expedited ones within 72 hours (CMS-0057-F): a deadline worth tracking.

Coding: a separate discipline

Why it matters: if the same company codes and is paid a percentage of collections, its incentives point one way. HHS-OIG has said for decades that percentage billing arrangements may increase the risk of upcoding (OIG).

Charge entry and claim scrubbing

Once a visit is coded, the charge becomes a claim. 'Scrubbing' is checking it before it goes out, so the payer doesn't reject it for something fixable:

• Patient and policy details match what the payer has on file.
• Codes pass payer edits, such as Medicare's National Correct Coding Initiative edits for code pairs that shouldn't be billed together (CMS).
• Modifiers, place of service, rendering and billing provider details are present and consistent.
• Any required authorization or referral number is attached.
• The claim is inside the payer's filing deadline: for Medicare, one calendar year after the date of service (42 CFR 424.44).

A claim that passes and has no defect preventing payment is what Medicare calls a clean claim; Medicare must pay most clean claims within 30 days of receipt or owe interest (SSA §1842(c); CMS manual §80.2). Clean claims are the cheapest claims a practice ever sends.

Submission, follow-up and payment posting

Claims usually go out through a clearinghouse, which checks format and routes them to payers. The billing company then watches for acknowledgments and rejections, follows up on claims with no response, and posts each payment from the payer's remittance. Every adjustment comes with a standard Claim Adjustment Reason Code saying why the claim was paid differently than billed (X12). Posting carefully is what makes denials visible: a denial missed at posting is a denial nobody works.

Denial management and appeals

A denial is a payer's decision not to pay a claim or line. The work is to sort it, fix or appeal it before the deadline, and stop the cause recurring:

1. Sort by reason code and payer. Eligibility, missing authorization and duplicate-claim denials are usually fixed and resubmitted; medical-necessity denials usually need records and an appeal.
2. Fix or appeal within the payer's window, with the documentation it asks for.
3. Find the cause. If one payer starts denying one code, that's a rule change, not bad luck. See payer friction.
4. Report initial and final denial rates by payer and reason, so you can see whether the fixes work. See benchmarks.

Appeals are worth filing. KFF found fewer than 1% of denied in-network claims were appealed in HealthCare.gov Marketplace plans in 2024 (KFF); HHS-OIG found that 13% of the Medicare Advantage prior authorization denials it reviewed, and 18% of payment denials, met Medicare coverage rules (OIG).

Patient billing

After payers pay, the patient owes the rest: copays, coinsurance and deductibles. Billing companies send statements, take payments, set up payment plans and answer patients' questions, under your name and your policies. Ask whether they answer patient calls, in what hours, and whether they send accounts to collections (and if so, only with your approval).

Reporting

The last job is telling you how it's going: collections, denials by payer and reason, days in A/R and aging, with definitions you can check. The benchmarks page explains each metric and how to compute it from your own data.

Questions people ask