What a Payer Audit Really Costs: A Calculation in Senior Physician Hours

Friday, 3:40 p.m. Medical controlling has sent over a folder: three audit notices from the Medizinischer Dienst (MD — the German payers' medical review service), all of them secondary misallocation — was the stay longer than necessary? — cases from November and December. For case two, the senior physician is to justify why the patient remained on the ward from day 9 to day 14. She remembers the patient — vaguely. The record remembers more precisely, but differently: chart pages, three consults, an attempted transfer to short-term care that failed over the weekend. Why day 11 was necessary is written nowhere. She still knows. Now she has to prove it.

The costs of MD audits are discussed in euros, and the euro figures are known: in 2022 alone, billing audits shifted around 1.197 billion euros from hospitals to the statutory health insurers [1]. The Medizinischer Dienst most recently reviewed 1.3 million hospital bills a year; 50.6 percent of the audited bills were contested [2] — noting that what gets audited is a conspicuous subset, not the average, and that the most frequent point of dispute is length of stay, not an invented service. For the department, the euro calculation is nevertheless the wrong level. It pays in a different currency: in specialist and senior physician hours.

What the time calculation consists of

A written statement on an eight-month-old case is made up of four items, and none of them can be delegated to people who cannot assess the case:

• Chart study: understanding the case again from its documented version — one's own memory does not count in the procedure.
• Reconstruction: piecing together what was self-evident at the time — the failed discharge attempt, the conversation with relatives, the weekend logic of the transfer — from peripheral entries. Or establishing that it is written nowhere.
• Drafting: a statement that holds up medically and concedes nothing legally, coordinated with medical controlling.
• The clock: the deadlines of the Prüfverfahrensvereinbarung — the binding agreement governing audit procedures — do not wait for duty rosters [3]. The work lands between two OR programs, after rounds, on the weekend.

These hours are missing where the department practices medicine: in the outpatient clinic, in the OR, in residency training. How many there are per year, nobody knows in most hospitals — the audit statistics count cases and euros, not physician hours. That would be a worthwhile first question for your own medical controlling.

Why the volume is rising

Today, a hospital's quarterly audit quota is determined by its contestation rate two quarters earlier: 5, 10 or 15 percent of bills may be audited (Section 275c of the German Social Code Book V, SGB V) [4]. On 10 July 2026, the Bundestag passed the GKV-Beitragssatzstabilisierungsgesetz (the act to stabilize statutory health insurance contribution rates); the Bundesrat waived the mediation committee the same day; from 2027 it tightens, among other things, billing audits [5]. According to expert analyses of the draft, the maximum audit quota rises from 15 to up to 25 percent; a simulation by the consultancy Medcontroller, based on the quota data of all 1,627 hospitals, estimates that the average audit quota could rise from 8.6 to around 20 percent — additional revenue losses of about 800 million euros per year, on average more than 500,000 euros per affected hospital [6]. Promulgation in the federal gazette was still pending at editorial deadline; the direction is clear.

Translated into the department's currency: more than a doubling of the average audit volume would mean correspondingly more hours of chart study, reconstruction and written statements — with an unchanged duty roster. And which quota tier a hospital is assigned to in 2027 is decided by its contestation rate in the quarters before. The starting position is being created now (in German).

Prevention is time policy

The core of the calculation: the same information costs very different amounts of physician time at two points in time. At the moment of treatment, the admission justification with findings and time of day is one sentence in the flow of documentation that is happening anyway; the progress note on the failed discharge attempt takes a minute. Eight months later, the same information is a reconstruction task of hours — with the risk that it can no longer be substantiated. Whoever saves minutes on documentation borrows that time from the future audit procedure, at a very bad rate.

Three rules follow:

1. A case becomes audit-proof when it is written. For cases with a long length of stay, the question "Would this satisfy an external reader in eight months?" belongs in the routine — the day that was medically justified needs an entry that shows it.
2. Lost cases need a feedback channel back to the ward. When the same objection arrives for the third time, that is not audit bad luck but a documentation pattern — and a solvable one.
3. Take the preliminary procedure seriously: 79 to 85 percent of audit cases are already resolved there [1]. If an audit ends without objection, the insurer pays a 300-euro flat fee for the effort; if it leads to a reduction, a flat surcharge of 400 euros has been added since December 2024 [4]. The asymmetry rewards hospitals whose records hold up.

A word on tools

Software, too, can be measured against the time calculation: it has to start where the expensive hours arise — in searching, assembling and substantiating. At one site whose case dialogs run through a board with linked audit notices, documents and deadlines, 120 and more case dialogs are handled in half a day today, where around 30 hours used to be needed (internal figure from one site). Drafting the correspondence from the substantiated record is in development. How the procedure works mechanically is described in our article on automating the case dialog (in German).

If you want to know how many senior physician hours are hidden in your audit statistics, talk to us — the question is worth asking even without any software decision. Or subscribe to our weekly briefing Visite (German; English edition Grand Rounds is in preparation), our letter on documentation, economics and AI in German healthcare.

Sources

1. GKV-Spitzenverband. Argumentationspapier zur Abrechnungsprüfung in Krankenhäusern. 26.04.2024. https://www.gkv-spitzenverband.de
2. Medizinischer Dienst Bund. Zahlen, Daten, Fakten 2024. https://www.medizinischerdienst.de/fileadmin/MD-zentraler-Ordner/Downloads/16_Zahlen_Daten_Fakten/2024_Zahlen-Daten-Fakten.pdf
3. Prüfverfahrensvereinbarung (PrüfvV) gemäß § 17c Abs. 2 KHG zwischen GKV-Spitzenverband und Deutscher Krankenhausgesellschaft. https://www.gkv-spitzenverband.de
4. § 275c SGB V. https://www.gesetze-im-internet.de/sgb_5/__275c.html
5. Bundesministerium für Gesundheit. Pressemitteilung: Bundestag beschließt GKV-Beitragssatzstabilisierungsgesetz. 10.07.2026. https://www.bundesgesundheitsministerium.de/ministerium/meldungen/bundestag-beschliesst-gkv-beitragssatzstabilisierunggesetz-pm-10-07-2026
6. Medcontroller. Wie sich höhere Prüfquoten auswirken werden. Simulation auf Basis der GKV-Quotendaten. 14.05.2026. https://www.medcontroller.de/2026/05/14/wie-sich-hoehere-pruefquoten-auswirken-werden/