Avoiding Rejections on Therapy Prescriptions: Step-by-Step Prescription Checks, Common Errors, and Retaxation Handling

What is a Billing Rejection – and How Does It Differ from a Retaxation?

In everyday billing practice the terms 'rejection' (Absetzung) and 'retaxation' (Retaxation) are often used interchangeably, but they formally describe different events. A rejection occurs when a statutory health insurer or its billing clearinghouse removes an item from an invoice and declines to pay it – either immediately during the billing review or retrospectively via a retaxation, where amounts already paid out are reclaimed.

The retaxation process under §302 SGB V is the statutory basis: insurers can demand repayment from service providers for incorrect prescriptions or formal violations, on the grounds of the contractual agreements governing reimbursement together with the HeilM-RL. There is no short exclusion period – retrospective audits covering several years are legally permissible and do occur. A consistent prevention strategy is therefore far more cost-effective than reactive retaxation management.

It is worth distinguishing formal errors (missing mandatory fields, incorrect stamps, illegible signatures) from substantive errors (wrong diagnostic group, quantities exceeding the permitted maximum, missing therapy goal, inadmissible combination of treatments). Both categories can lead to rejections, but they carry different prospects for a successful objection.

• ✓Formal errors: mandatory fields missing or illegible (prescribing doctor's name, insurer number, IK, date)
• ✓Substantive errors: HeilM-RL requirements not met (quantity, frequency, diagnostic group, therapy goal)
• ✓Deadline errors: first treatment not started within the prescription validity window
• ✓Signature errors: doctor's signature missing, applied by stamp instead of by hand, or signed by a non-authorised person

Step 1: Prescription Receipt – Checking Before the First Session

The single most important rule is this: the prescription is checked in full before treatment begins, not afterwards. A very common mistake is to defer the review to billing day – at which point the treatment has already been delivered and the scope for correction is minimal. Take the time at first contact with the patient and the prescription to go through every field systematically.

The following information must be present on every therapy prescription, completely and correctly: the insured person's name and date of birth, the insurer's name and insurance number (from the eGK card), the institutional identifier (IK) and doctor number of the prescribing practice, the date of issue, the diagnosis with ICD-10 code, the diagnostic group, the therapy goal and the leading symptom, the prescribed treatments with quantity and frequency, and the prescribing doctor's own handwritten signature. If even a single one of these items is missing, the retaxation risk is substantial.

Practical tip: clarify any gaps immediately when the prescription arrives – ideally by telephone or via a KIM message to the prescribing practice. Many doctors are happy to correct formal errors quickly when notified promptly. Do not wait until billing day.

Step 2: Mandatory Formal Details – the Most Common Sources of Error

Among the most frequent formal grounds for rejection are missing or incorrect stamps from the prescribing practice, a missing or ambiguous date of issue, and a missing or stamped-rather-than-handwritten doctor's signature. Locum or substitute doctors in particular sometimes sign without a qualifying note, or a person without a statutory health insurance licence countersigns.

Pay close attention to the insurance data as well: outdated health insurance cards or incorrectly read IK numbers regularly cause billing problems. If patients cannot produce their insurance card, document this and request it subsequently – a verbal statement is not sufficient for billing purposes.

One frequently underestimated field is 'urgent clinical need': if a doctor ticks this box, the usual 14-day window for starting treatment is replaced by a 3-working-day deadline, and the first session must take place within that shorter window. Conversely, failing to note the urgency flag can lead to a rejection if documentation shows treatment began within 3 days but the abbreviated deadline was not recorded.

• ✓Prescribing practice stamp must be legible and complete (LANR/BSNR)
• ✓Date of issue: clearly and unambiguously stated; any later amendment must be countersigned by the doctor
• ✓Signature: handwritten; facsimile stamps not accepted; locum doctors must be identifiable
• ✓Insurance data: current, complete, from a valid eGK scan
• ✓Urgency flag: only if genuinely urgent; if ticked, first session must begin within 3 working days

Step 3: Substantive Check Against the Heilmittel-Richtlinie

Beyond the formal details, the substantive correctness of the prescription is decisive. The Heilmittel-Richtlinie issued by the G-BA (Federal Joint Committee) sets out binding rules on which treatments are eligible for reimbursement for each diagnostic group, in what quantities and at what frequency. A prescription that deviates from these rules will be retaxed by the insurer – even if the error lies with the prescribing practice. The financial consequence falls on the service provider.

Check therefore: does the stated diagnostic group correspond to the ICD-10 code? Does the prescribed treatment belong to that diagnostic group (primary or supplementary treatment under the HeilM-RL)? Is the prescribed quantity within the standard prescription volume? If the standard volume is exceeded, has a therapy report been submitted or the insurer's prior authorisation been obtained? For open prescriptions (Blankoverordnungen), is the therapist's clinical decision-making freedom correctly documented?

For open prescriptions – where therapists determine the type, duration, frequency, and quantity of treatment themselves – documentation requirements are even more extensive, since the cost decision authority has been explicitly transferred to the therapist and insurers routinely request documentation during retaxation audits. TheraNext supports this with an integrated HeilM-RL traffic-light checker that automatically validates prescribed quantities and diagnostic groups against the current treatment catalogue and flags deviations before submission.

• ✓Diagnostic group to ICD-10 code: does the mapping comply with the HeilM-RL?
• ✓Treatment: primary or supplementary – is only a permissible combination prescribed?
• ✓Quantity: is the standard prescription volume observed, or has an excess been authorised?
• ✓Frequency: is the frequency entry complete and consistent with the HeilM-RL?
• ✓Therapy report present for repeat or increased prescriptions?

Step 4: Knowing and Meeting Deadlines

Deadlines are an independent and frequently underestimated ground for rejection. The key rule is: the first treatment must begin within 14 calendar days of the prescription's date of issue. This deadline applies even if patients cancel a booked appointment at short notice. Starting treatment after the 14-day window has lapsed risks rejection of the entire prescription – not only the individual session delivered late.

If it is foreseeable that the 14-day deadline cannot be met due to capacity constraints, patients should be referred to another practice or the prescribing practice should be asked to issue a new prescription with the current date. Prescriptions where treatment begins after the deadline are fundamentally not reimbursable – even if the treatment itself was clinically impeccable.

Further deadlines to keep in mind: two prescriptions for the same diagnostic group must not overlap in time (parallel billing is not permitted). Prescriptions requiring prior authorisation must have the insurer's written approval before the first session. Therapy reports for repeat or elevated prescriptions must have reached the insurer by the required date.

• ✓Treatment start: no later than 14 calendar days after the date of issue
• ✓Urgency: start within 3 working days if the urgency flag is marked
• ✓Parallel prescriptions: no temporal overlap for the same diagnostic group
• ✓Prior authorisation: written approval from insurer before the first session
• ✓Prescription validity: monitor deadlines in the practice management system – do not let prescriptions sit

Step 5: Documentation as Your Best Defence

Comprehensive treatment documentation is not bureaucratic box-ticking – it is the most effective safeguard in the event of a retaxation. Insurers auditing a claim can require evidence that every individual treatment session is substantiated with the date, duration, treatment provided, and the name of the therapist who delivered it. If documentation is absent or incomplete, the session is treated as unproven and rejected.

Document every session immediately after it takes place, not in batches at the end of the day. Particularly important: record any appointment that was not kept by the patient (no-show) – these sessions must not be invoiced, and a documentation gap may be misread during an audit. Also note any situation in which a patient presented a prescription with a deadline issue and why treatment was nonetheless begun (for instance, written confirmation of urgency from the prescribing practice).

For open prescriptions the documentation burden is greater still: therapists must provide a traceable rationale for their clinical decisions (type, duration, frequency, quantity), since that decision-making responsibility has explicitly been delegated to them. A structured therapy plan with ongoing progress notes in the practice management system makes this considerably easier and reduces the time needed to respond to an audit request.

Retaxation Handling: What to Do When a Rejection Arrives

Even with the utmost care, a rejection notice can arrive. The critical response is swift and structured. Begin by analysing the stated grounds precisely: is it a formal error, a substantive disagreement with the HeilM-RL, or a deadline issue? This distinction determines whether an objection is worthwhile and what the prospects of success are.

Formal errors that originated with the prescribing practice can often be remedied by a retrospective correction from the doctor – provided the original prescribing intent can be reconstructed unambiguously. Submit the corrected prescription with an explanatory covering letter to the insurer and set a reasonable response deadline. For substantive disputes about the HeilM-RL, a detailed written argument citing the specific provision is necessary.

Pay close attention to the insurer's internal objection deadlines: these are set out in the respective reimbursement agreements under §302 SGB V and can range from a few weeks to several months. Missed deadlines forfeit the right to object. Document every step of the communication with the insurer in writing – in a dispute, evidence of timely submission is decisive. Practices that handle their §302 billing in-house have a clear advantage here: they have direct access to all documents and do not need to route enquiries through an intermediary billing centre.

• ✓Analyse the rejection notice immediately: formal, substantive, or deadline issue?
• ✓Contact the prescribing practice promptly to request a correction of formal errors
• ✓Respect the insurer's objection deadline (see the relevant reimbursement agreement)
• ✓Document all written communication with the insurer in full
• ✓Back the objection with a specific HeilM-RL reference and, where applicable, treatment documentation

Systematic Prevention: Structured Review Routines and Digital Support

The most effective long-term strategy against rejections is prevention through routine. Teams that process every incoming prescription against a fixed checklist consistently record fewer retaxations than practices where reviews are conducted ad hoc. A written review routine – ideally anchored in the practice handbook – also protects against staff turnover and ensures that knowledge does not rest with individual team members.

Digital practice management systems can automate a significant share of the review work. An integrated HeilM-RL traffic-light checker validates the prescribed quantity against the diagnostic group, confirms that the frequency is within the permitted range, and flags whether a therapy report is required – all at the point of prescription entry, not after a rejection arrives. Automated deadline monitoring with reminders prevents prescriptions from slipping past the 14-day boundary unnoticed. In TheraNext, this validation logic is built directly into the §302 billing workflow, so deviations are highlighted before submission rather than after the rejection.

It is also worth conducting a regular internal review of your own rejection rate broken down by error category. Knowing whether your practice's rejections are predominantly formal or substantive allows you to target training and system adjustments precisely where they are needed. Even a modest reduction in rejection rates quickly offsets the effort invested in a structured review process.