The invoicable line items most sites forget to bill

Why sites under-bill

Most sites do not under-bill because they are careless. They under-bill because the budget conversation stops at the visit schedule. Coordinators, pharmacists, and investigators do extra work in small increments, no one logs it in the moment, and by quarter end the effort is real but unprovable. Sponsors pay against evidence, not memory. A second cause is fear: teams worry that invoicing for study-level work looks aggressive. It does not, when the clinical trial agreement (CTA) already allows it.

Start with the agreement, not the invoice

Before you invoice anything beyond the visit grant, read three places in order. First, the budget exhibit, line by line, including footnotes, where thresholds, caps, and conditions usually live. Second, the payment terms in the CTA, which define what counts as invoicable, what needs prior written approval, and how long you have to submit. Third, any pass-through language, which separates costs paid as they happen from costs bundled into visit payments. Highlight every line not tied to a completed visit. That list is your site-level invoicing map.

Build a one-page tracker from that map: contract section, billable trigger, evidence required, and owner for each item. Review it at start-up, at every amendment, and at close-out. Most forgotten revenue is visible in the contract on day one.

The ten categories sites most often miss

1. Start-up and close-out work

Spot it: Look for start-up fees, pharmacy set-up, document preparation, and close-out or termination lines in the budget exhibit. Document it: Keep dated records of regulatory submissions, essential document completion, initiation visit preparation, and return or destruction of study materials. Invoice it: Bill start-up items when the defined milestone is complete, and close-out items when the close-out visit and final deliverables are done, not months later.

2. Protocol amendments and re-consenting

Spot it: Search the CTA and budget exhibit for amendment, protocol revision, and re-consent language. Amendments often trigger institutional review board (IRB) submission work, document revision, retraining, and re-consenting of active participants. Document it: Log the amendment number and approval date, staff time on revised documents, and a re-consent log tying each signed informed consent form (ICF) to a participant and date. Invoice it: Submit when the amendment work and re-consenting for the affected cohort are finished, with the approval letter attached if required.

3. Additional monitoring-visit support

Spot it: Many agreements allow invoicing when monitoring exceeds the assumed frequency or duration, or when extra visits are requested for data cleaning, audits, or inspection readiness. Document it: Record the visit date, why it was additional, the staff who supported it, and the hours spent preparing records and resolving follow-up items. Invoice it: Bill after each additional visit, referencing the visit report or written sponsor request.

4. Source-data verification query resolution beyond a threshold

Spot it: Look for source-data verification (SDV) and query language that sets an expected volume or time allowance, with extra work invoicable above that threshold. This matters when electronic data capture (EDC) queries multiply late in a study. Document it: Track query counts by period, who resolved them, and the time required, using EDC system reports rather than estimates. Invoice it: Bill at the interval the contract allows, with the query report as evidence, so the sponsor can reconcile volume to the threshold.

5. Unscheduled visits

Spot it: Check how the agreement handles visits outside the schedule of assessments, including safety follow-ups, repeat laboratory work, and early termination visits. Document it: Record the clinical reason, the principal investigator (PI) direction or protocol basis, the procedures performed, and the source documents created that day. Invoice it: Bill promptly after the visit, labeling it as unscheduled and linking it to the visit documentation, so it is not mistaken for a duplicate scheduled visit.

6. Pharmacy handling and temperature-excursion work

Spot it: Review pharmacy fees, dispensing and accountability lines, and language on investigational product handling, storage monitoring, and excursion assessment. Document it: Keep dispensing and accountability logs, temperature logs, excursion reports, sponsor correspondence about product usability, and records of quarantine, replacement, or destruction. Invoice it: Bill routine handling at the contracted interval, and excursion work when the assessment is closed and product disposition is documented.

7. Record retention and archiving

Spot it: Look for archiving, storage, and record retention fees, and note when the retention period begins, since it often starts after close-out when teams have moved on. Document it: Inventory the boxes or electronic archives sent to storage, the retention start date, the storage location, and any retrieval work requested later. Invoice it: Bill the archiving fee at transfer, and ongoing retention exactly as the agreement structures it, with the inventory as evidence.

8. Equipment calibration attributable to a study

Spot it: Some budgets allow calibration or certification costs when a protocol requires specific equipment with documented calibration. Document it: Keep calibration certificates dated within the study period, identify the equipment used for the protocol, and file the vendor invoice showing the work performed. Invoice it: Submit after calibration is complete, attaching the certificate, and only for the share the contract attributes to the study.

9. Staff training for protocol-specific procedures

Spot it: Check for training fees or invoicable activities when staff must complete protocol-specific training, procedure certification, or system training beyond general orientation. Document it: Keep attendance records, completion certificates, the training agenda, and the names and roles of staff trained. Invoice it: Bill when training is complete for the defined group, with completion records ready for sponsor review.

10. Screen-failure work where the contract allows

Spot it: Read the screening section carefully. Some agreements pay a screen-failure rate, a partial screening payment, or invoicable screening procedures; others bundle screening into enrollment payments. The contract, not habit, decides. Document it: Maintain a screening log showing each candidate, the procedures completed, and the reason for failure, with source documents supporting every procedure claimed. Invoice it: Bill at the contracted interval after reconciling the screening log to source records, and never bill screening work the agreement does not allow.

Documentation that survives sponsor review

Sponsor reviewers approve what they can trace. For every site-level charge, build a small evidence packet at the time of the work: the contract citation, a dated log or report, the role of the person who did the work, and any written sponsor approval the CTA requires. Store the packet with the invoice copy, not in a coordinator's inbox. If prior approval is required, get it in writing before the work begins whenever possible.

A prompt invoicing routine

Set a monthly rhythm, even on slow studies. The study lead reviews the tracker, confirms which triggers occurred, assembles the evidence packets, and sends the invoices. The PI or designee confirms that clinical items, such as unscheduled visits, match the source record. Finance confirms that nothing was already paid inside a visit payment, which prevents double-billing.

Closing checklist

• Budget exhibit and payment terms reviewed line by line, including footnotes
• One-page tracker built for every non-visit invoicable item
• Contract section, trigger, evidence, and owner recorded for each item
• Prior written approval obtained where the CTA requires it
• Dated logs, reports, and certificates filed with each invoice
• Screening, query, and monitoring volumes reconciled to source systems
• Monthly invoicing review held, even when no invoice is due
• Start-up, amendment, and close-out milestones checked against the tracker

Sites do not need to bill harder. They need to bill completely, for work the agreement already recognizes, with evidence created in the moment.