Private Health Insurance Billing: How Does It Work?

Private health insurance (PKV) billing works on the reimbursement principle (Kostenerstattungsprinzip). Private patients receive the doctor's invoice directly and submit it to their PKV. The insurer reimburses the contractually agreed amount to the account on file. For inpatient stays, the hospital often bills the insurer directly, while invoices from the chief physician still go to the patient.

Billing in PKV: understanding the reimbursement principle

The legal framework for reimbursement

Billing in private health insurance is built fundamentally on the so-called reimbursement principle. Unlike statutory health insurance (GKV), where the in-kind benefit principle applies and the doctor bills the health fund directly, private patients enter into a direct treatment contract with the doctor. The insurance contract between the private health insurer and the policyholder sets out the exact scope of insured benefits and the corresponding premium [4]. The patient is therefore the primary debtor of the medical claim. This principle creates full transparency over the services billed and the costs actually incurred.

Patients see exactly which diagnosis was made and immediately see which treatment steps the doctor has charged for. This transparency is a major advantage of the private system, but it also requires active management of one's own health spending. The legal basis is the German Civil Code (Bürgerliches Gesetzbuch, BGB). The doctor provides a service that the patient pays for; the insurer only enters the picture in a second step, as the party providing reimbursement. This two-step process defines the entire administration of private health insurance — and it is crucial to understand.

The treatment contract and the GOÄ fee schedule

Every private medical bill is based on the Fee Schedule for Doctors (Gebührenordnung für Ärzte, GOÄ) or, for dentists, the GOZ. Under German civil law, a doctor's invoice is due immediately upon receipt, entirely independent of when the insurer reimburses the patient [2]. In practice, however, many doctors or their external billing agencies grant a payment term of 14 to 30 days. A patient automatically falls into default after 30 days if the invoice carries a corresponding notice to that effect [2]. Invoices should therefore be submitted to the PKV promptly to avoid having to front unnecessary amounts from your own funds. Health insurance premiums cover this financial risk contractually.

Reminder fees charged by medical billing agencies are generally not covered by insurers — this is important to know. Patients are responsible for transferring payment to the doctor on time. Solid liquidity management is therefore essential for privately insured people. Anyone who forwards invoices digitally right away benefits from the fast processing times of modern insurers; often the money is in the account before the doctor's payment deadline even expires.

Transparency and personal responsibility

The reimbursement principle requires a certain degree of personal responsibility from policyholders. Carefully checking the invoice for accuracy before forwarding it prevents billing errors and strengthens your position as an informed patient. Modern PKV tariffs support this process with digital submission channels that reduce the administrative effort to a minimum. Reimbursement is then paid directly into your bank account, so the doctor can be paid on time without tying up your own funds for long. This naturally also applies to outpatient treatment, where billing works in exactly the same way.

As a digital insurance broker licensed under Section 34d(1) of the Gewerbeordnung, nextsure advises its clients in detail on these administrative procedures. iMatch GmbH, through which nextsure operates, is registered in the German Chamber of Commerce's broker register (DIHK Vermittlerregister). We know these processes inside out. Good advice always includes explaining the billing procedures. Many new clients are initially wary of the paperwork, but digital tools have largely eliminated this pain point — app-based submission today often takes only a few seconds.

The process: submitting a private doctor's invoice

From the doctor's visit to the invoice

The administrative process begins right at the doctor's visit. After treatment, or a series of treatments, the doctor issues a detailed invoice under the GOÄ rules. This invoice is delivered either by regular mail or through secure digital portals. It contains all the diagnosis and service codes relevant to later reimbursement by the insurer. It is important to check this invoice promptly and submit it to the insurer. The statutory limitation period for submitting doctor's invoices to a private health insurer is exactly three years, starting from the end of the year in which the invoice was issued [1].

In practical terms: an invoice from February 2024 can be submitted up until December 31, 2027. After that, the right to reimbursement lapses irrevocably. Keep these deadlines in view — a good filing system helps enormously here. Despite this generous window, submitting promptly is usually the smarter choice, since it keeps you on top of your actual health spending at all times.

Digital and postal submission

Most private health insurers now offer very convenient apps that let you simply photograph invoices with your smartphone or upload them as a PDF. This considerably speeds up the reimbursement process, often to a processing time of just a few days. Alternatively, the classic postal route is still available, though it takes more time. For prescription medication, the stamped private prescription must be submitted to PKV for reimbursement [1]. Without the pharmacy's official stamp, insurers generally refuse payment. Keep copies of all submitted documents carefully until the reimbursement has fully arrived in your account, since this makes it easier to answer any follow-up questions from claims handlers — a step well worth taking. Digital copies in secure cloud storage are ideal for this. Some insurers also offer portals where you can track the processing status in real time. This transparency reduces the need for follow-up calls to customer service and gives policyholders peace of mind.

Review and payout by PKV

After the invoice arrives, PKV reviews in detail whether the billed services are contractually covered and whether any deductible or tariff waiting periods apply. Once the review is complete, PKV transfers the reimbursement amount to the reference account on file. If anything is unclear, the insurer may request further medical documents or a more detailed explanation from the treating doctor. To avoid such delays from the outset, every diagnosis on the invoice must be documented clearly and unambiguously. This naturally also applies to preventive check-ups at the doctor, which are reimbursed very differently depending on the chosen tariff. Some premium tariffs cover preventive services completely, without counting against the deductible; other tariffs only reimburse the standard statutory check-ups. Check your tariff. Knowing your own policy terms precisely protects against unexpected co-payments. For complex treatments, a quick call to the claims department in advance is often worthwhile, so you can confirm cost coverage in writing and avoid later disputes.

Steps in PKV billing

• Doctor's visit and treatment as a private patient.
• Receipt of the detailed invoice under the GOÄ.
• Patient reviews the invoice.
• Invoice submitted to PKV (via app or post).
• Insurer reviews and reimburses the amount.
• Patient pays the doctor's invoice.

Using the insurer's app speeds up processing.

Hospital stays: direct billing and the chief physician

Inpatient billing simplified

For a hospital stay, billing is often considerably simpler than in purely outpatient care. By presenting the so-called card for privately insured patients directly on admission, the hospital can bill general hospital services and tariff surcharges for a single or two-bed room directly with the insurer [3]. In these standardized cases, the usual upfront payment by the patient is eliminated entirely [1]. The card for privately insured patients is a voluntary service card from insurers that considerably simplifies issuing prescriptions and invoices at doctors' practices and clinics [3]. It serves as direct proof of existing cover, saving a lot of time. The hospital administration communicates directly with the insurer over secure data lines, so patients can focus entirely on recovering without worrying about the administrative details of accommodation. This direct billing is a major advantage for expensive inpatient stays — it prevents patients from having to front five-figure sums out of their own pocket.

The chief physician's invoice

A very important exception to this convenient direct billing is elective medical services (wahlärztliche Leistungen) — in particular, treatment by the chief physician or other specialized consultants. Invoices for these specific chief-physician treatments are still sent directly to the patient, who must then forward them promptly to PKV [3]. Depending on the severity of the procedure and the fee multiplier applied under the GOÄ, these invoices can be extremely high. Prompt submission via the app secures reimbursement before the doctor's payment deadline expires. Chief physicians often bill their services through specialized private billing agencies, which are very persistent about enforcing their claims. Act quickly here — delays inevitably lead to reminder notices and extra stress during recovery. It is advisable to scan these invoices and submit them digitally immediately upon receipt. Insurers often prioritize inpatient invoices to protect their clients' liquidity.

Elective services and tariff details

Before a planned hospital stay, carefully checking the tariff's elective services (such as chief-physician treatment or a single room) is absolutely essential. If you use services that are not covered under your contract, you must bear the resulting difference entirely yourself. Cost coverage by private health insurance depends heavily on the individually chosen tariff components. A quick call to the insurer before admission creates immediate clarity and prevents financial surprises later. Always have cost coverage for planned operations confirmed in writing, and present this document when you're admitted to the clinic — it provides certainty, and the hospital then also knows exactly which services it may bill for. nextsure recommends that clients systematically file such confirmations in their digital health record. Especially for treatment at purely private clinics, prior cost approval is essential. Some tariffs impose restrictions here that you need to know about in advance.

Medication and medical aids: submitting prescriptions correctly

Billing for medication

To bill medication correctly, the PKV system first requires an upfront payment at the pharmacy. The private prescription (usually printed on blue paper) issued by the treating doctor is redeemed at the pharmacy and paid for directly by the patient. The officially stamped original prescription, often marked with the pharmacy's exact prices, is then submitted to the insurer for reimbursement [1]. The pharmacy stamp is the decisive criterion for validity here. Make sure the pharmacy stamps the prescription correctly, since unstamped prescriptions are often not accepted by insurers — this is a common mistake. Without the stamp, there is no proof that the medication was actually dispensed and paid for. For chronically ill patients, these upfront payments quickly add up to substantial amounts. It is therefore advisable to upload pharmacy receipts through the insurer's smartphone app promptly as well, so the money you fronted flows back into your account within a few days.

Medical aids and prior approval

For medical aids such as wheelchairs, special orthopedic braces, or expensive vision aids, most tariffs have special rules. Many tariffs require, above a certain invoice amount (for example, €500), a detailed cost estimate and prior approval from the insurer's claims department. In these cases, the doctor's prescription must be submitted together with the medical supply store's cost estimate before the final purchase. This secures cost coverage within the contractual framework and protects against expensive purchasing mistakes. Insurers' catalogs of covered aids differ considerably in scope: open catalogs also reimburse novel technical aids, while closed catalogs are strictly limited — check this carefully. Anyone who buys an expensive hearing aid without prior approval risks being left with a large share of the cost themselves. Submitting the treatment and cost plan in advance gives both sides legal certainty. The insurer reviews medical necessity and communicates the exact reimbursement amount in writing.

Collecting receipts

It can be a very sound strategy to collect smaller invoices and prescriptions over the year and only submit them together later, especially if you are aiming for a tariff-based premium refund (Beitragsrückerstattung, BRE). If you submit no invoices in an entire calendar year, many insurers refund a significant portion of the premiums paid. At year-end, calculate carefully whether the total of your collected invoices actually exceeds the possible premium refund. This requires a strategic approach to submitting receipts — a simple calculator is usually enough. Compare the guaranteed refund with your actual expenses: if expenses are lower, pay the invoices out of pocket. This way you maximize the financial benefit of your PKV contract. Many insurers now offer digital calculators in their customer portals that make this decision easier, showing at a glance whether submitting invoices is still worthwhile in the current calendar year.

Deductible and premium refund

The effect of the deductible

The agreed deductible (Selbstbeteiligung or Selbstbehalt) is an absolutely central factor in annual billing. If you chose a tariff with a deductible, insurers subtract this fixed amount from the first reimbursements of a calendar year. If your contractual deductible is, say, €500, you pay the first doctor's invoices and medications entirely yourself up to exactly that sum. Only after that does the insurer start actually reimbursing further costs. This noticeably lowers monthly premiums but requires a degree of liquidity in the event of illness. The deductible resets to zero every year on January 1 — important to know. Invoices from December that are only submitted in January often still count toward the old year, provided the treatment date falls in December. This strict separation by treatment date prevents policyholders from artificially circumventing their deductible by tactically delaying submissions. Insurers check the service date on the GOÄ invoice very closely.

Strategic submission

Because of the contractual deductible and possible premium refunds (BRE), it is often very advisable to carefully collect invoices first. If the total of your invoices at year-end is clearly below the deductible or the guaranteed BRE, do not submit these receipts at all — bear the costs entirely yourself and secure the lucrative insurer refund instead. This is a key structural difference from statutory health insurance and requires active, forward-looking management of your own health spending. Anyone who calculates cleverly here saves thousands of euros over the years. The premium refund is usually paid out in late summer of the following year. It is a strong financial incentive for cost-conscious behavior. Some premium tariffs even offer success-based refunds that can grow to as much as six months' premiums if no benefits are claimed over several years — a substantial reward for a healthy lifestyle.

Watch the deadlines

When strategically collecting invoices, be sure to observe the statutory limitation periods. As already explained, you have exactly three years to submit invoices to the insurer [1]. However, do not wait too long to submit if the total already clearly exceeds the deductible — prompt submission protects your personal liquidity and guards against reminder notices from doctors. Even in the case of a longer illness and adjusting daily sickness benefit, quick and transparent communication with the insurer plays an enormously important role. Daily sickness benefit secures your income, and delays in submitting sick notes can quickly lead to existential financial strain. Always submit these documents immediately upon receipt. Combining daily sickness benefit with ongoing doctor's invoices requires clean administrative management during longer periods of illness — use your insurer's digital channels to rule out documents getting lost in the post.

Highly simplified example. Check the exact terms of your own tariff.

Dental billing: the treatment and cost plan

Special rules for dentures and implants

Billing for dental treatment, especially expensive dentures or elaborate orthodontics, follows very strict formal rules. Before starting extensive treatment, the dentist must draw up a detailed treatment and cost plan (Heil- und Kostenplan, HKP). This plan itemizes the planned dental procedures under the Fee Schedule for Dentists (GOZ) and the expected material and lab costs precisely. Be sure to submit this plan to your PKV before treatment begins — without prior approval, you risk significant cuts to reimbursement later. Dental treatment is among the most expensive medical procedures; an implant with bone augmentation can quickly cost several thousand euros. Clarifying cost coverage in advance is therefore not mere formality but pure financial self-protection. The dentist is legally required to inform you of the expected costs, and the HKP serves as the binding basis for this financial disclosure duty.

Reviewing the treatment and cost plan

The insurer's claims department reviews the submitted HKP in detail for medical necessity and the exact tariff coverage. Contracts often include tariff limits, so-called dental tiers (Zahnstaffeln), that strictly cap maximum reimbursement in the first years of the policy. After review, PKV informs you in writing what amount will likely be reimbursed and what share you will bear yourself. This binding commitment gives you financial certainty before you finally consent to treatment and incur high costs. Claims handlers also check whether the fee multipliers applied under the GOZ are adequately justified. If a medical justification for a high multiplier is missing, reimbursement is often cut to the standard maximum rate — this is common practice. In such cases, ask your dentist for a more detailed written statement, which can then be submitted afterward to still secure full reimbursement. A good dentist supports their private patients through this administrative process.

Billing after completion

Once dental treatment is successfully completed, you receive the final invoice. Submit this together with the already approved HKP to the insurer. If the final invoice deviates significantly from the original cost estimate, the insurer may raise questions or refuse to reimburse the difference. Transparent communication with the dentist about the approved financial scope is therefore essential to avoid later discrepancies in reimbursement. Inform the practice immediately if the insurer has rejected certain items on the HKP — the dentist can then adjust the treatment plan. Alternatively, you can consciously decide to pay the rejected items out of pocket. This clarity before the first drilling prevents unpleasant surprises after the dentures are fitted. Modern dental practices often offer installment payments if your share of the cost exceeds your current budget despite insurance cover — raise this topic openly.

Avoiding common mistakes in PKV billing

Missing diagnoses on the invoice

A very common mistake in administrative billing is the absence of a clear, unambiguous diagnosis on the doctor's invoice. Private health insurance needs the diagnosis to legally verify the medical necessity of the billed GOÄ codes — this is crucial. Ask your doctor to always note the diagnosis precisely and legibly on the invoice. If this is missing, reimbursement is delayed considerably, since the insurer has to send written queries to the doctor, costing time and nerves. Especially for unclear symptoms or preventive measures, doctors often forget to code a firm diagnosis. Check every invoice for this important point as soon as you receive it — a quick call to the practice is usually enough to request a corrected invoice. Never submit invoices that simply say "consultation at the patient's request" when an actual condition was in fact present; such wording almost always leads to rejection.

Ignoring deadlines and formalities

Carelessly ignoring deadlines can quickly become expensive for private patients. While you legally have three years to submit to the insurer [1], the doctor's payment term is usually a short 14 to 30 days [2]. If you submit the invoice too late, you inevitably have to pay upfront yourself or risk annoying reminder fees from the medical billing agency. Also pay attention to formal details, such as submitting original documents by post or clear, sharp scans in the smartphone app — blurry photos are rejected by insurers' automatic text recognition, which delays the process. Always photograph documents in good light against a dark, high-contrast background, so the insurer's AI can read all the data correctly right away. Most apps give instant feedback on image quality — use this feature to avoid unnecessary back-and-forth with claims handlers.

Not knowing your tariff terms

Many policyholders do not know the exact terms and exclusions of their own tariff in detail. If you use medical services that are not covered under your contract (for example, treatment by an alternative practitioner under a basic tariff), no reimbursement follows, logically. Check your policy document regularly and find out the exact cost coverage before expensive treatments. nextsure objectively analyzes existing tariffs and professionally adjusts them when needs change. As a registered insurance broker, we have access to the detailed policy terms of all relevant providers and help you identify coverage gaps early.

Switching tariffs within the same insurer is often possible without a new health check if the level of benefits stays similar. Talk to us — we optimize your cover so that billing runs smoothly if the worst happens. Choosing the right tariff is the best prevention against trouble with reimbursement. Anyone who knows the rules of the game uses the private health insurance system to their maximum advantage.