Accurate billing of enteral nutrition claims begins with two fundamental concepts:

1. Calculating the correct units of service (UOS), and
2. Reporting the appropriate date span.

Errors can result in unnecessary claim denials, overpayments, or requests for additional documentation. This article reviews common billing requirements and provides reminders to help suppliers submit accurate claims the first time.

Calculating Units of Service Correctly

For enteral nutrition formulas, Medicare defines one UOS as 100 calories. Suppliers should calculate units based on the beneficiary's prescribed daily caloric intake and the number of days being billed.

Example

A treating practitioner prescribes 1,500 calories per day, for 30 days.

• 1,500 calories ÷ 100 = 15 units per day
• 15 units × 30 days = 450 units

The claim would be billed as 450 UOS for a 30-day supply.

Reminders

• The unit calculation is based on the prescribed calories, not the packaging quantity.
• If two enteral nutrients described by the same HCPCS code are provided simultaneously, bill them on a single claim line and combine the calories when calculating units.
• Review calculations carefully before claim submission to avoid overbilling or underbilling.

Date Span Must Reflect What Was Dispensed

A common misconception is that date spans must match the anticipated utilization period. For enteral nutrition, suppliers are billing for the quantity of nutrition furnished to the beneficiary. The date span should reflect the quantity dispensed, not necessarily the dates on which the beneficiary is expected to consume the product.

When submitting a claim:

• The "From" date is the date the product is delivered, shipped, or picked up by the beneficiary.
• The "To" date reflects the number of days supplied.
• The date span should correspond to the quantity dispensed.

Example: Initial Delivery

A supplier ships an initial 30-day supply of nutrition on June 18.

• “From” date: June 18
• “To” date: July 17

Even if the beneficiary does not begin using the nutrition until June 20, the claim date span remains June 18 through July 17 because the supplier is billing for what was furnished.

Prospective Billing Does Not Mean Advancing the Date Span Each Month

Medicare's refill requirements permit suppliers to furnish recurring supplies before the beneficiary exhausts their current supply, subject to refill rules. However, suppliers should avoid a pattern where claims are billed progressively earlier each month.

For recurring supplies:

• Contact the beneficiary no sooner than 30 days before the end of the current utilization period.
• Deliver or ship supplies no sooner than 10 days before the beneficiary is expected to exhaust the current supply.
• Bill based on the quantity dispensed and the applicable date span.

Daily Supply Allowances: One Unit Per Day

Suppliers should also remember that enteral feeding supply allowances are daily fees.

For HCPCS codes B4034, B4035, B4036, and B4148, only one unit of service may be billed per day because these codes represent a daily supply allowance rather than a specific kit quantity.

Overlapping date spans or billing more than one daily supply allowance for the same day may result in claim denials.

Clarification

Before submitting an enteral nutrition claim, verify the following:

• One UOS equals 100 calories for nutrition.
• Units billed reflect the prescribed calories not the packaging quantity.
• The "From" date reflects when the product was delivered, shipped, or picked up.
• The "To" date reflects the number of days dispensed, not the expected utilization dates.
• Date spans and units support the quantity furnished to the beneficiary.
• Daily supply allowance codes are limited to one unit per day.

Accurate UOS calculations and date span reporting ensures claims are processed correctly and reduce the likelihood of denials, audits, and overpayments. Suppliers should review their billing practices regularly and ensure claim submissions align with Medicare enteral nutrition requirements. Refer to Local Coverage Determination (LCD) L38955 and Policy Article A58833 for more information.