The hospital revenue cycle, end to end

What are the stages of the hospital revenue cycle?

The hospital revenue cycle runs from the first scheduling call to the last dollar posted and reported. On the Nucleus Align home page we describe it as six stages: Eligibility, Coding, Claim, Denials, Payment, and A/R and patients. This guide walks each one with the details that apply to a hospital, which a physician practice never sees.

Hospitals often group the stages into front-end, mid-cycle and back-end. That grouping is a common industry convention, not a rule from CMS, so the boundaries vary by organization. The table below shows how we line the two up.

The stage a problem shows up in is rarely the stage that caused it. A denial worked in stage four usually started in stage one or two, which is why the sections below name the origin of each common denial.

What happens in the eligibility stage, before the visit?

Eligibility is the stage where the hospital learns who will pay and what the payer needs before care is delivered. It covers scheduling, pre-registration, eligibility verification, prior authorization and the patient status decision. Our eligibility verification and prior authorization services cover the same work for scheduled patients.

Scheduled care and emergency care follow different rules, and a hospital has to run both.

Scheduled inpatient and outpatient care

Emergency care

Under 42 CFR 489.24, a hospital with an emergency department must give an appropriate medical screening examination to anyone who comes to the department, whatever their ability to pay. Section 489.24(d)(4) says the hospital may not delay the screening or further treatment to ask about payment or insurance status. It also says the hospital may not seek authorization from the patient's insurer until after screening and the start of stabilizing treatment.

The same paragraph allows reasonable registration, including asking whether the patient is insured and by whom, as long as that does not delay care. So the ED eligibility check happens after the screening has started, and payer authorization or notification follows it. Read the detail on EMTALA and billing.

How does coding work in a hospital, and how does charge capture fit in?

Coding in a hospital is two jobs: capturing every billable charge during the stay or visit, and assigning the diagnosis and procedure codes that decide payment. Charge capture is the process that turns each supply, drug, test and service into a charge line the claim can carry. The chargemaster is the list those lines come from. The chargemaster review guide covers that list in full, so this section stays on the claim path.

After charges land, certified coders work from the chart. Clinical documentation integrity (CDI) is the review that asks physicians to clarify documentation before the final code set is set, because the code can only be as specific as the note.

Inpatient and outpatient run on different payment systems

The CMS MS-DRG page says the grouper uses the principal diagnosis, up to 24 additional diagnoses and up to 25 procedures. Under 42 CFR 412.60 each discharge goes to a single DRG. Payment is the hospital's rate per case multiplied by the weight of that DRG.

On the outpatient side, 42 CFR 419.2 says Medicare pays predetermined amounts for services identified by HCPCS codes. The calendar year 2026 conversion factor is $91.415, published in 90 FR 53448 and effective January 1, 2026. Many supporting items are packaged into the main service, which is why a missed or miscoded line can change nothing in payment yet still matter for cost reporting.

Three hospital rules that decide the code set before coding begins

• Patient status. The two-midnight rule at 42 CFR 412.3 turns on the admitting practitioner's expectation when the order is written. Since September 1, 2025, Medicare Administrative Contractors perform the short-stay reviews. Condition code 44 exists for the case where a hospital changes inpatient to outpatient before billing.
• Bundling before admission. Under 42 CFR 412.2(c)(5) the 3-day payment window folds diagnostic outpatient services from the admission date and the 3 calendar days before into the inpatient payment.
• Observation. Observation hours are reported under revenue code 0760 or 0762 with HCPCS G0378 as units of hours. See revenue code 0762.

Emergency visits add a facility leveling question. Hospitals set their own visit-level guidelines for the ED, and CMS did not adopt national visit guidelines in the CY 2008 OPPS rule. Our ED facility level coding page covers the detail.

What is discharged not final billed (DNFB)?

DNFB is the list of patients who have left the hospital but whose claim has not been released. It is an internal work queue, not a CMS term, and the usual causes are an incomplete chart, a missing coding query answer, a pending authorization or an unreconciled charge. Many hospitals track the dollar value and the number of days on that list. A common way to calculate DNFB days is the unbilled dollar total divided by average daily gross charges. Pick one definition and keep it fixed so trend lines mean something.

How does a hospital claim get built and sent?

A hospital claim is built on the UB-04 (CMS-1450), sent electronically as the 837I, and released only after edits clear. The professional claim for a physician's own work goes on the CMS-1500 and is a separate claim. The two claims must agree on dates and diagnoses. Our hospital and facility billing service handles the institutional side.

Medicare sets the time limit. Under 42 CFR 424.44(a)(1), claims go to the contractor within 1 calendar year after the date of service. The CMS MLN guide for the 837I and CMS-1450 adds that you cannot appeal a determination that a claim was not filed on time.

The UB-04 locators a hospital biller checks first

Our edits are described in the approved language on our hospital billing page: bill type, revenue codes, patient status, condition and occurrence codes, authorization requirements and payer-specific rules. The claim leaves within 24 hours of charge entry once those pass.

Inpatient bills wait for the discharge, and long stays wait for interim billing

An inpatient claim cannot be finalized until the principal diagnosis, all procedures and the discharge status are known, because they set the DRG. Outpatient claims can drop sooner, but the 3-day window means a claim for the admitting hospital's pre-admission outpatient services may need to be combined with the inpatient claim. Where a payer's contract allows interim bills for long stays, the same edits apply to each interim bill.

Where do hospital denials originate, and how are they worked?

No official source publishes a split of hospital denials by cause, so we do not quote one. What the remittance does give you is a reason: every adjustment carries a CARC and often a RARC, and each points back to a stage. Sort your own denials by that origin before you decide where to spend effort.

A rejection and a denial are different. The Medicare Claims Processing Manual, chapter 1, section 70.2.3.2 treats a claim returned to the provider as not a claim at all, so you fix and resubmit it. A denied claim is a determination you can appeal. See rejection versus denial.

For Medicare Part A and B, 42 CFR 405.942 sets the redetermination request at 120 calendar days from the date the party receives the notice, and receipt is presumed 5 days after the notice date. A party can also ask for a reopening within 1 year of the initial determination for any reason under 42 CFR 405.980. The full ladder of appeal levels is on the Medicare appeals pages of this site.

Inpatient DRG denials add a clinical-validation step: the payer compares the codes to the record and may move the claim to a different DRG. Keep the physician advisor and the coder in the same loop so an appeal answers the clinical question directly, not only the billing one.

How do payment posting and reconciliation work?

Payment means posting the remittance accurately and comparing it with what the payer should have paid. The 835 ERA carries the payment, the contractual adjustment, any patient responsibility, and the reason codes behind each adjustment. Posting the cash without that comparison is how underpayments become permanent.

• Post by claim line, not only by claim total, so a denied line is visible.
• Separate the contractual adjustment from denials and from patient responsibility.
• Compare each payment to an expected amount built from the payer contract or the Medicare rate.
• Route variances to a work queue instead of writing them off at posting.

The example is deliberately small. Multiply a variance like that across a month of lines and the expected amount becomes the most important number in cash posting. Our hospital billing service reconciles each payment against the expected reimbursement.

What does the A/R and patient stage cover?

A/R and patients is the stage that follows every balance until it is paid or resolved. It covers payer follow-up on open claims, patient statements and payment plans, financial assistance, and credit balances. Aged balances are a separate work stream.

• Payer follow-up. Work open claims by age bucket and by payer, oldest and largest first, and tie each note to a next action and date.
• Patient balances. A hospital's financial assistance policy (FAP) governs who is offered assistance, so the statement process must follow it before anything is sent. We do not give legal advice on charity care rules; your counsel and compliance office own that.
• Credit balances and overpayments. Under 42 CFR 401.305(b)(1) a Medicare overpayment must be reported and returned by the later of 60 days after the date it was identified, or the date any corresponding cost report is due. The lookback is 6 years under 401.305(f). Read the 60-day overpayment rule. This guide is not legal advice, and counsel should review your process.

Closing the loop on A/R also feeds the front end. A pattern in aged balances, for example one payer that never receives a particular attachment, should trigger a change in stage one or two.

Which KPIs should a hospital CFO track?

Track one measure per stage, define each in writing, and report them the same way every month. We do not quote benchmarks here because published benchmarks differ in how each metric is defined. The formulas below are a common way to calculate each measure, not an official standard, so check your own definition before comparing to anyone else.

For the full KPI definitions and how to report them, read the KPI guide for CFOs. Our own clean claim rate is 95%.

When should a hospital outsource part of the revenue cycle?

Outsource the part where your own results trail the work, or where the work needs skills that are hard to hire. A hospital does not have to hand over everything. Many hand over denials, A/R or coding backlogs first and keep patient access in house.

Before you sign anything, read what a contract should say in the billing company contract checklist and have your counsel review it. This guide is not legal advice. The choice also depends on cost, and the in-house versus outsourced cost guide shows how to compare.

How do patient financial services and billing work together?

Patient financial services (PFS) is the part of the billing office that works with the patient after insurance has paid or denied. The billing team hands over a clean patient responsibility amount, and PFS collects it, sets up plans and applies the financial assistance policy. The two teams need one source of truth for the balance and a shared view of denials so a patient is not billed for a balance the payer still owes.

How we handle hospital revenue cycle work

We run the institutional claim from charge entry to final payment: UB-04 claim preparation, revenue code validation, submission, payment reconciliation and denial management for inpatient, outpatient and emergency care. Claims go out within 24 hours of charge entry and denials are worked within 48 hours. Our UB-04 accuracy checks cover bill type, revenue codes, patient status, condition and occurrence codes, authorization requirements and payer-specific rules.

We align each EHR, clearinghouse and payer portal workflow with verified team experience, standard claim validation, reconciliation controls and performance monitoring. Across the practices and facilities we serve, we report a 95% clean claim rate, a 25% average revenue lift and 15 to 20% of revenue recovered from denials and old A/R. We also recover underpaid out-of-network revenue through open negotiation and federal IDR; see the hospital page for how that fits.

If you want to see how this maps to your payer mix and your own denial data, book a call.