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Bundesportal | Besondere Meldepflicht in Krankenhäusern, Heimen und ähnlichen Einrichtungen Anmeldung
If you are admitted to or move into a hospital, home or similar institution, you only have to register as soon as your stay exceeds three months and you are not registered for an apartment within Germany.
↗ https://verwaltung.bund.de/leistungsverzeichnis/en/leistung/99115007104000