What Is the Inpatient Basic Fee｜Components, Facility Standards, and Add-Ons Explained

The inpatient basic fee is the most fundamental medical fee a hospital bills per day when it admits a patient. It forms the base of inpatient revenue and simultaneously evaluates the hospital's structure itself, such as nurse staffing and average length of stay. This article explains what the fee is, what it bundles, how grades are determined, and the add-ons and billing cautions that follow.

As a premise, points and thresholds are revised every two years. This article prioritizes structural understanding; figures are marked as reference values as of the FY2024 revision (effective June 2024). Verify changes in the FY2026 revision (effective June 2026) against MHLW notices and the latest fee schedule.

Definition and position of the inpatient basic fee

In the fee schedule, inpatient fees consist of four parts: the inpatient basic fee, inpatient basic fee add-ons, specific inpatient fees, and short-stay surgery basic fees. The inpatient basic fee evaluates the ward's fundamental structure and is the foundational per-diem point value. It is set for each ward type: general, long-term care, tuberculosis, psychiatric, specified-function hospital, specialty hospital, disability facility, and clinic-with-beds.

The fee is registered per ward. Different wards in the same hospital may register different inpatient basic fees, which is the premise of care-mix hospitals. Wards that register a specific inpatient fee, such as an ICU or integrated community care ward, bill that fee instead. In other words, every inpatient is billed either an inpatient basic fee or a specific inpatient fee each day.

• Four parts of inpatient fees: basic fee / add-ons / specific fees / short-stay surgery fees
• Registered per ward and billed per day
• Wards on a specific inpatient fee bill that fee instead of the basic fee

What the inpatient basic fee bundles

The inpatient basic fee is a bundled point value covering the basic costs of hospitalization: fundamental medical management by physicians, nursing care by nursing staff, and the care environment such as rooms, bedding, and utilities. Simple tests and procedures, part of injection technique fees, and routine hygiene supplies used during the stay also cannot be billed separately and are treated as included.

Conversely, surgery, anesthesia, expensive tests, imaging, rehabilitation, and drug costs for medication and injections are not included and are billed fee-for-service. Meals are evaluated separately as the inpatient meal care benefit, with patients paying a standard co-payment based on income. Private room charges are also handled separately as non-insured costs.

Correctly understanding this scope matters for avoiding billing errors. Billing an item already included counts as duplicate billing and invites returns or reductions; conversely, missing a billable item is lost revenue. EHR and claims systems are expected to check the bundled/fee-for-service distinction automatically.

• Included: basic medical management, nursing, care environment (room, bedding, utilities), simple tests and procedures
• Not included: surgery/anesthesia, expensive tests, imaging, rehabilitation, drug costs (fee-for-service)
• Separate: inpatient meal benefit, private room charges (non-insured)

Facility standard 1: nurse staffing (what 7:1 and 10:1 mean)

The most basic factor determining the grade is nurse staffing. Labels such as 7:1 and 10:1 mean one nursing staff member per 7 or 10 inpatients. This is an effective ratio averaged across three shifts per day, not that one nurse cares for seven patients at any given moment; on night shifts each nurse covers more patients.

The ratio is calculated from the monthly average daily inpatient count and the total monthly working hours of nursing staff on the ward. Compliance must be checked monthly, and there is a constant risk of falling below the standard due to maternity or parental leave, resignations, or sudden increases in admissions. If the standard is no longer met, the registration must be changed promptly, and a downgrade directly affects revenue.

Closely related is the requirement that monthly average night-shift hours per nursing staff member not exceed 72 hours. Exceeding this triggers a reduction in the inpatient basic fee. Securing nursing staff and building shift schedules are therefore core hospital operations for maintaining the fee.

• 7:1 and 10:1 are effective ratios averaged over all shifts, not momentary assignments
• Compliance is checked on monthly actuals; vacancies or surges can breach it
• Exceeding the 72-hour monthly average night-shift limit triggers a reduction

Facility standards 2: nurse ratio and average length of stay

In addition to staffing, the share of registered nurses among nursing staff is a requirement. The acute general fee requires 70% or more registered nurses, while the regional general and long-term care fees have thresholds such as 40% or 20% depending on grade. How licensed practical nurses and nursing assistants are deployed is decided by balancing this ratio requirement against labor costs.

Average length of stay indicates how long patients remain on the ward and is calculated from the most recent three months. Acute general grade 1 requires 16 days or fewer, grades 2 through 6 require 21 or fewer, regional general grades 1 and 2 require 24 or fewer, and grade 3 requires 60 or fewer (as of FY2024). The shorter the requirement, the more the grade is tested on its acute function.

Some patients are excluded from the calculation, such as "specified patients" hospitalized beyond 90 days and those billed short-stay surgery basic fees. Accurately tracking who counts is the basis of managing the metric. Monitoring daily average length of stay in the EHR or data warehouse and intensifying discharge coordination as the threshold nears is now standard practice in many acute hospitals.

• Nurse ratio: 70%+ for acute general; some grades set 40% or 20%
• Average stay: last three months' actuals; acute general grade 1 ≤16 days (as of FY2024)
• Knowing excluded patients (e.g., beyond 90 days) is the basis of managing the metric

Facility standard 3: severity, medical and nursing need

The acute general fee requires a certain share of patients meeting the severity, medical and nursing need criteria. Nursing need is evaluated daily per patient across monitoring and procedures (A items), patient condition (B items), and medical status such as surgery (C items), with patients above a threshold counted as meeting the criteria. Grade 1 demands the highest share, with thresholds easing as grades descend.

There are two methods: Need I, recorded daily by nursing staff on assessment sheets, and Need II, determined automatically from clinical data (EF files). Need II is mandatory for acute general grade 1 and hospitals above a certain size, and the FY2024 revision removed B items from the facility standard determination among other changes. The shift to data-based evaluation reduces nurses' documentation burden, while making the accuracy of coding and order entry directly affect billing.

Beyond maintaining the grade, nursing need is also a national indicator of whether acute wards truly treat acute patients. Recent revisions have kept tightening the thresholds, and more hospitals are strengthening discharge support or considering conversion to integrated community care wards to retain grade 1. Daily aggregation and forecasting of nursing need is among the most closely watched metrics in acute hospital management.

• Daily evaluation of A (procedures/monitoring), B (patient condition), and C (surgery, etc.) items
• Need I (assessment sheet) and Need II (automatic from EF files)
• FY2024 revised items and thresholds; the tightening trend continues

General rules: structural requirements common to all wards

To bill the inpatient basic fee, in addition to grade-specific requirements, a ward must meet general rules common to all inpatient fees. Five have long been required: an inpatient care plan explained to the patient, infection control, a medical safety management system, pressure ulcer prevention, and a nutrition management system. Failing these results in a reduction or ineligibility.

The FY2024 revision added decision-making support and minimization of physical restraint to the general rules. Minimization requires recording the reason, duration, and observation for any restraint, and establishing a committee and guidelines. Restraint records had been emphasized mainly in psychiatry and long-term care; now that they are a requirement for all inpatient fees including general wards, standardizing them in the EHR has become urgent.

• Five long-standing requirements: care plan, infection control, medical safety, pressure ulcer prevention, nutrition management
• Added in FY2024: decision-making support, physical restraint minimization
• Non-compliance means reduction or ineligibility; a common documentation system across wards is needed

How inpatient basic fee add-ons work

Add-ons are billed on top of the inpatient basic fee or specific inpatient fee. They divide broadly into those evaluating hospital-wide structure and those evaluating individual patient conditions and care. The former include the comprehensive inpatient system add-on, acute enhancement add-on, medical record management add-on, physician clerical support add-on, medical safety add-on, infection control improvement add-on, and data submission add-on, billable for all eligible patients once registered.

The latter include the emergency medical management add-on, discharge support add-on, dementia care add-on, delirium high-risk care add-on, nutrition support team add-on, and pressure ulcer high-risk care add-on, each requiring documentation that the patient met the criteria. Some add-ons, such as the initial-period add-on emphasizing early hospitalization, are billed according to days since admission.

Because add-ons are numerous and their requirements detailed, omissions are common. Patient-specific add-ons in particular often require records of multidisciplinary intervention, conferences, and explanations to patients and families, so the presence or absence of a record directly affects revenue. Whether the EHR can automatically surface add-on candidates and flag documentation gaps directly affects the workload of both billing and ward staff.

• Structural: comprehensive inpatient system, acute enhancement, record management, physician clerical support, data submission, etc.
• Patient-specific: emergency management, discharge support, dementia care, delirium high-risk, nutrition support team, etc.
• Meeting documentation requirements decides billability; preventing omissions is a management issue

Length of stay and the fee: initial add-ons and long stays

The fee also varies with length of stay. In general wards, reflecting the concentration of resources early in a stay, initial add-ons are set for the first 14 days and for days 15 through 30. This design means daily revenue is effectively highest early and declines as stays lengthen, which is one reason shorter average stays directly affect hospital revenue.

Conversely, patients hospitalized in a general ward beyond 90 days are treated as "specified patients" and, in principle, switch to a bundled evaluation modeled on the long-term care ward fee (the specified inpatient basic fee), except for patients in conditions designated by the Minister, such as those with malignancy or on ventilators. The system is designed so that holding long-stay patients in acute wards is disadvantageous for both revenue and facility standards.

Detailed rules also govern the start date when a patient transfers between wards or is readmitted shortly after discharge. Readmission for the same condition may be counted continuously with the previous stay, affecting initial add-ons and the average length of stay calculation. Operating these rules accurately requires a system that links admission history with diagnoses.

• Initial add-ons: two tiers (≤14 days, days 15–30); daily revenue highest early
• Specified patients beyond 90 days: switch to a long-term-care-style bundle (with exclusions)
• Start-date rules for readmission and transfer affect initial add-ons and average stay

The inpatient basic fee from the patient's perspective

From the patient's side, the inpatient basic fee appears on the bill under "inpatient fees." Fees are calculated at 10 yen per point, and patients pay that amount multiplied by their co-payment rate (10% to 30% depending on age and income). For example, as a reference, a patient with a 30% co-payment staying one day in an acute general grade 1 ward (1,688 points as of FY2024) would pay roughly 5,000 yen for the basic fee portion.

Actual hospital bills, however, add add-ons, tests, surgery, drugs, and meals on top, so the basic fee alone is not the full picture. Monthly co-payments are also capped under the high-cost medical expense system; amounts above the cap are reimbursed, or window payments are held to the cap by presenting an eligibility certificate. When explaining to patients, framing the inpatient basic fee as the base of the hospital bill aids understanding.

• 10 yen per point; co-payment = points × 10 yen × co-payment rate (10–30%)
• Bills stack add-ons, fee-for-service items, and meals on the basic fee
• Monthly co-payments are capped under the high-cost medical expense system

The weight of the inpatient basic fee in hospital management

Inpatient revenue typically accounts for 60% to 70% of medical revenue in acute hospitals, with the inpatient basic fee and specific inpatient fees at its core. In DPC hospitals, the portion corresponding to the basic fee is replaced by diagnosis-group bundled points, but the registered grade is reflected through functional evaluation coefficient I, so maintaining the grade remains fundamental to revenue.

If a 300-bed acute hospital drops from acute general grade 1 to grade 2, the daily point difference multiplied by beds and occupancy is lost annually. The reference difference is 44 points per day, which at 300 beds and 85% occupancy translates to tens of millions of yen per year. Conversely, rigorous management of nursing need and average stay to retain the higher grade protects that revenue.

Many hospitals therefore monitor facility-standard metrics (nurse staffing, night-shift hours, average stay, nursing need, home discharge rate, etc.) daily or weekly and share them at management meetings. Whether action can be taken early as a metric nears its threshold determines whether the grade is retained. The data sources are the EHR and billing systems, and how timely and accurately data can be extracted from them determines the quality of management.

• Inpatient revenue is 60–70% of acute hospital medical revenue; the basic fee is its core
• A grade change impacts revenue by beds × occupancy × point difference, often tens of millions of yen a year
• Daily or weekly monitoring of facility-standard metrics is key to retaining the grade

The inpatient basic fee and the EHR: records underpin billing

Billing the inpatient basic fee and its add-ons ultimately comes down to proving through records that requirements were met. Nursing-need assessments, restraint records, care plan preparation and explanation, pressure ulcer and nutrition assessments, and multidisciplinary conference notes are mostly produced through daily entry by frontline staff, nurses above all.

In conventional EHRs, these records tend to be entered separately "for billing," adding to nurses' burden. Systems have since emerged that automatically pick up nursing-need items from daily care records, alert wards to missing documentation, and suggest discharge support timing. AI-enabled EHRs are also advancing efforts to extract items matching evaluation criteria from free-text nursing notes.

When selecting or replacing an EHR, list the inpatient basic fee and add-ons your hospital registers and confirm concretely how the system supports each documentation requirement. Support for Need II, facility-standard dashboards, automatic surfacing of add-on candidates, and standard templates for restraint records are representative items to check from the inpatient fee perspective.

• Most billing requirements rest on frontline staff's daily records
• Automatic extraction of nursing need and add-on candidates from records reduces burden and improves accuracy
• In selection, check documentation support for each registered fee and add-on

Summary

The inpatient basic fee is the per-diem foundation of inpatient care, bundling medical management, nursing, and the care environment. Its grade is determined by facility standards such as nurse staffing, nurse ratio, average length of stay, and nursing need, with general rules common to all wards and numerous add-ons stacked on top. Understanding initial add-ons, long-stay handling, and the relationship with DPC reveals how a hospital's inpatient revenue is built.

Because compliance with facility standards is proven by records, managing the inpatient basic fee is inseparable from frontline documentation. Points and thresholds change with each revision, so treat the figures here as FY2024 reference values and verify FY2026 changes against MHLW notices and the latest fee schedule. The overall landscape of inpatient fees by hospital and ward type is covered in the companion article on types of hospitals and wards.