diff --git a/backend/app/api/cases.py b/backend/app/api/cases.py
new file mode 100644
index 0000000..607f31f
--- /dev/null
+++ b/backend/app/api/cases.py
@@ -0,0 +1,403 @@
+"""Cases API routes — list, detail, update, ICD entry, coding, template download."""
+
+import logging
+from datetime import datetime, timezone
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
+from fastapi.responses import StreamingResponse
+from sqlalchemy import or_
+from sqlalchemy.orm import Session
+
+from app.core.dependencies import get_current_user, require_admin
+from app.database import get_db
+from app.models.case import Case
+from app.models.user import User
+from app.schemas.case import (
+    CaseListResponse,
+    CaseResponse,
+    CaseUpdate,
+    CodingUpdate,
+    ICDUpdate,
+)
+from app.services.audit_service import log_action
+from app.services.icd_service import generate_coding_template, get_pending_icd_cases, save_icd_for_case
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+# ---------------------------------------------------------------------------
+# Static routes MUST be defined BEFORE the parameterised /{case_id} routes
+# to avoid FastAPI interpreting "pending-icd" etc. as a case_id.
+# ---------------------------------------------------------------------------
+
+
+@router.get("/pending-icd", response_model=CaseListResponse)
+def list_pending_icd(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(50, ge=1, le=200),
+    jahr: Optional[int] = Query(None),
+    fallgruppe: Optional[str] = Query(None),
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Return cases that still need ICD codes (icd IS NULL).
+
+    Accessible to both admin and dak_mitarbeiter users.
+    """
+    cases, total = get_pending_icd_cases(
+        db, jahr=jahr, fallgruppe=fallgruppe, page=page, per_page=per_page
+    )
+    return CaseListResponse(
+        items=cases,
+        total=total,
+        page=page,
+        per_page=per_page,
+    )
+
+
+@router.get("/pending-coding", response_model=CaseListResponse)
+def list_pending_coding(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(50, ge=1, le=200),
+    jahr: Optional[int] = Query(None),
+    fallgruppe: Optional[str] = Query(None),
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Return cases with gutachten=True but no gutachten_typ yet (admin only).
+
+    These cases have received a Gutachten but still need classification
+    (Bestätigung/Alternative) and therapy-change coding.
+    """
+    query = db.query(Case).filter(
+        Case.gutachten == True,  # noqa: E712
+        Case.gutachten_typ == None,  # noqa: E711
+    )
+
+    if jahr:
+        query = query.filter(Case.jahr == jahr)
+    if fallgruppe:
+        query = query.filter(Case.fallgruppe == fallgruppe)
+
+    total = query.count()
+    cases = (
+        query.order_by(Case.datum.desc())
+        .offset((page - 1) * per_page)
+        .limit(per_page)
+        .all()
+    )
+
+    return CaseListResponse(
+        items=cases,
+        total=total,
+        page=page,
+        per_page=per_page,
+    )
+
+
+@router.get("/coding-template")
+def download_coding_template(
+    jahr: Optional[int] = Query(None),
+    fallgruppe: Optional[str] = Query(None),
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Download an Excel template for ICD coding.
+
+    The template contains all cases that still need ICD codes, with an
+    empty ICD column for DAK users to fill in.
+    """
+    xlsx_bytes = generate_coding_template(db, jahr=jahr, fallgruppe=fallgruppe)
+
+    from io import BytesIO
+
+    return StreamingResponse(
+        BytesIO(xlsx_bytes),
+        media_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+        headers={
+            "Content-Disposition": 'attachment; filename="ICD_Coding_Template.xlsx"'
+        },
+    )
+
+
+# ---------------------------------------------------------------------------
+# Paginated case list
+# ---------------------------------------------------------------------------
+
+
+@router.get("/", response_model=CaseListResponse)
+def list_cases(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(50, ge=1, le=200),
+    jahr: Optional[int] = Query(None),
+    kw: Optional[int] = Query(None),
+    fallgruppe: Optional[str] = Query(None),
+    has_icd: Optional[bool] = Query(None),
+    has_coding: Optional[bool] = Query(None),
+    search: Optional[str] = Query(None, min_length=1, max_length=200),
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Return a paginated, filterable list of cases.
+
+    Accessible to both admin and dak_mitarbeiter users.
+
+    Filters:
+    - ``jahr``: calendar year
+    - ``kw``: calendar week
+    - ``fallgruppe``: one of onko, kardio, intensiv, galle, sd
+    - ``has_icd``: True = only cases WITH icd; False = only cases WITHOUT
+    - ``has_coding``: True = only with gutachten_typ; False = only without
+    - ``search``: free-text search across nachname, vorname, fall_id, kvnr
+    """
+    query = db.query(Case)
+
+    if jahr is not None:
+        query = query.filter(Case.jahr == jahr)
+    if kw is not None:
+        query = query.filter(Case.kw == kw)
+    if fallgruppe is not None:
+        query = query.filter(Case.fallgruppe == fallgruppe)
+    if has_icd is True:
+        query = query.filter(Case.icd != None)  # noqa: E711
+    elif has_icd is False:
+        query = query.filter(Case.icd == None)  # noqa: E711
+    if has_coding is True:
+        query = query.filter(Case.gutachten_typ != None)  # noqa: E711
+    elif has_coding is False:
+        query = query.filter(Case.gutachten_typ == None)  # noqa: E711
+    if search:
+        like_pattern = f"%{search}%"
+        query = query.filter(
+            or_(
+                Case.nachname.ilike(like_pattern),
+                Case.vorname.ilike(like_pattern),
+                Case.fall_id.ilike(like_pattern),
+                Case.kvnr.ilike(like_pattern),
+            )
+        )
+
+    total = query.count()
+    cases = (
+        query.order_by(Case.datum.desc(), Case.id.desc())
+        .offset((page - 1) * per_page)
+        .limit(per_page)
+        .all()
+    )
+
+    return CaseListResponse(
+        items=cases,
+        total=total,
+        page=page,
+        per_page=per_page,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Single case detail
+# ---------------------------------------------------------------------------
+
+
+@router.get("/{case_id}", response_model=CaseResponse)
+def get_case(
+    case_id: int,
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Return a single case by its database ID."""
+    case = db.query(Case).filter(Case.id == case_id).first()
+    if not case:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Case not found",
+        )
+    return case
+
+
+# ---------------------------------------------------------------------------
+# Update case (admin only)
+# ---------------------------------------------------------------------------
+
+
+@router.put("/{case_id}", response_model=CaseResponse)
+def update_case(
+    case_id: int,
+    payload: CaseUpdate,
+    request: Request,
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Update arbitrary case fields (admin only).
+
+    Only fields included in the request body are applied. Changes are
+    recorded in the audit log.
+    """
+    case = db.query(Case).filter(Case.id == case_id).first()
+    if not case:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Case not found",
+        )
+
+    update_data = payload.model_dump(exclude_unset=True)
+    if not update_data:
+        return case  # Nothing to update
+
+    old_values: dict = {}
+    new_values: dict = {}
+
+    for field, value in update_data.items():
+        current = getattr(case, field)
+        # Convert date objects to strings for JSON-safe audit log
+        current_cmp = current
+        value_cmp = value
+        if current_cmp != value_cmp:
+            old_values[field] = str(current) if current is not None else None
+            new_values[field] = str(value) if value is not None else None
+            setattr(case, field, value)
+
+    if new_values:
+        case.updated_by = user.id
+        db.commit()
+        db.refresh(case)
+
+        log_action(
+            db,
+            user_id=user.id,
+            action="case_updated",
+            entity_type="case",
+            entity_id=case.id,
+            old_values=old_values,
+            new_values=new_values,
+            ip_address=request.client.host if request.client else None,
+            user_agent=request.headers.get("user-agent"),
+        )
+
+    return case
+
+
+# ---------------------------------------------------------------------------
+# ICD entry
+# ---------------------------------------------------------------------------
+
+
+@router.put("/{case_id}/icd", response_model=CaseResponse)
+def set_case_icd(
+    case_id: int,
+    payload: ICDUpdate,
+    request: Request,
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Set ICD codes for a case. Accessible to both admin and dak_mitarbeiter.
+
+    Replaces any existing ICD codes. The raw ICD string is validated,
+    normalised, and split into individual ``CaseICDCode`` entries.
+    """
+    try:
+        case = save_icd_for_case(db, case_id, payload.icd, user.id)
+    except HTTPException:
+        raise
+    except ValueError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail=str(exc),
+        )
+
+    log_action(
+        db,
+        user_id=user.id,
+        action="icd_entered",
+        entity_type="case",
+        entity_id=case.id,
+        new_values={"icd": payload.icd},
+        ip_address=request.client.host if request.client else None,
+        user_agent=request.headers.get("user-agent"),
+    )
+
+    return case
+
+
+# ---------------------------------------------------------------------------
+# Coding (Gutachten classification)
+# ---------------------------------------------------------------------------
+
+
+@router.put("/{case_id}/coding", response_model=CaseResponse)
+def set_case_coding(
+    case_id: int,
+    payload: CodingUpdate,
+    request: Request,
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Set coding fields on a case (admin only).
+
+    Records the Gutachten classification (Bestätigung/Alternative) and
+    therapy-change flags.
+    """
+    case = db.query(Case).filter(Case.id == case_id).first()
+    if not case:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Case not found",
+        )
+
+    # Validate gutachten_typ
+    if payload.gutachten_typ not in ("Bestätigung", "Alternative"):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="gutachten_typ must be 'Bestätigung' or 'Alternative'",
+        )
+
+    # Validate therapieaenderung
+    if payload.therapieaenderung not in ("Ja", "Nein"):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="therapieaenderung must be 'Ja' or 'Nein'",
+        )
+
+    old_values = {
+        "gutachten_typ": case.gutachten_typ,
+        "therapieaenderung": case.therapieaenderung,
+        "ta_diagnosekorrektur": case.ta_diagnosekorrektur,
+        "ta_unterversorgung": case.ta_unterversorgung,
+        "ta_uebertherapie": case.ta_uebertherapie,
+    }
+
+    case.gutachten_typ = payload.gutachten_typ
+    case.therapieaenderung = payload.therapieaenderung
+    case.ta_diagnosekorrektur = payload.ta_diagnosekorrektur
+    case.ta_unterversorgung = payload.ta_unterversorgung
+    case.ta_uebertherapie = payload.ta_uebertherapie
+    case.coding_completed_by = user.id
+    case.coding_completed_at = datetime.now(timezone.utc)
+    case.updated_by = user.id
+
+    db.commit()
+    db.refresh(case)
+
+    new_values = {
+        "gutachten_typ": case.gutachten_typ,
+        "therapieaenderung": case.therapieaenderung,
+        "ta_diagnosekorrektur": case.ta_diagnosekorrektur,
+        "ta_unterversorgung": case.ta_unterversorgung,
+        "ta_uebertherapie": case.ta_uebertherapie,
+    }
+
+    log_action(
+        db,
+        user_id=user.id,
+        action="coding_completed",
+        entity_type="case",
+        entity_id=case.id,
+        old_values=old_values,
+        new_values=new_values,
+        ip_address=request.client.host if request.client else None,
+        user_agent=request.headers.get("user-agent"),
+    )
+
+    return case
diff --git a/backend/app/api/import_router.py b/backend/app/api/import_router.py
new file mode 100644
index 0000000..ff52ee3
--- /dev/null
+++ b/backend/app/api/import_router.py
@@ -0,0 +1,268 @@
+"""Import API routes — CSV upload/preview/confirm, ICD xlsx upload, import log."""
+
+import logging
+from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, Depends, File, HTTPException, Query, UploadFile, status
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.config import get_settings
+from app.core.dependencies import get_current_user, require_admin
+from app.database import get_db
+from app.models.audit import ImportLog
+from app.models.user import User
+from app.schemas.import_schemas import ImportPreview, ImportResult
+from app.services.csv_parser import parse_csv
+from app.services.icd_service import import_icd_from_xlsx
+from app.services.import_service import confirm_import, preview_import
+
+logger = logging.getLogger(__name__)
+settings = get_settings()
+
+router = APIRouter()
+
+
+# ---------------------------------------------------------------------------
+# Response schemas (co-located for simplicity)
+# ---------------------------------------------------------------------------
+
+
+class ICDImportResponse(BaseModel):
+    """Result of importing ICD codes from an xlsx file."""
+
+    updated: int
+    errors: list[str] = []
+
+
+class ImportLogResponse(BaseModel):
+    """Single import-log entry."""
+
+    id: int
+    filename: str
+    import_type: str
+    cases_imported: int
+    cases_skipped: int
+    cases_updated: int
+    errors: Optional[str] = None
+    imported_by: Optional[int] = None
+    imported_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class ImportLogListResponse(BaseModel):
+    """Paginated import-log response."""
+
+    items: list[ImportLogResponse]
+    total: int
+    page: int
+    per_page: int
+
+
+# ---------------------------------------------------------------------------
+# CSV Import — preview (dry-run)
+# ---------------------------------------------------------------------------
+
+
+@router.post("/csv", response_model=ImportPreview)
+async def upload_csv_preview(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Upload a CRM CSV file and preview what will be imported.
+
+    Returns a list of rows with duplicate detection. No data is written
+    to the database — the caller must confirm via ``POST /csv/confirm``.
+    """
+    if not file.filename or not file.filename.lower().endswith(".csv"):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="File must be a .csv file",
+        )
+
+    content = await file.read()
+    if len(content) > settings.MAX_UPLOAD_SIZE:
+        raise HTTPException(
+            status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
+            detail=f"File exceeds maximum size of {settings.MAX_UPLOAD_SIZE // (1024 * 1024)}MB",
+        )
+
+    try:
+        parsed = parse_csv(content, file.filename)
+    except Exception as exc:
+        logger.exception("CSV parsing failed for %s", file.filename)
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"CSV parsing failed: {exc}",
+        )
+
+    return preview_import(db, parsed, file.filename)
+
+
+# ---------------------------------------------------------------------------
+# CSV Import — confirm (write to DB)
+# ---------------------------------------------------------------------------
+
+
+@router.post("/csv/confirm", response_model=ImportResult)
+async def confirm_csv_import(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Re-upload the same CSV file to confirm the import.
+
+    The file is re-parsed and non-duplicate cases are inserted into the
+    database. An entry is written to the ``import_log`` table.
+    """
+    if not file.filename or not file.filename.lower().endswith(".csv"):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="File must be a .csv file",
+        )
+
+    content = await file.read()
+    if len(content) > settings.MAX_UPLOAD_SIZE:
+        raise HTTPException(
+            status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
+            detail=f"File exceeds maximum size of {settings.MAX_UPLOAD_SIZE // (1024 * 1024)}MB",
+        )
+
+    try:
+        parsed = parse_csv(content, file.filename)
+    except Exception as exc:
+        logger.exception("CSV parsing failed for %s", file.filename)
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"CSV parsing failed: {exc}",
+        )
+
+    return confirm_import(db, parsed, file.filename, user.id)
+
+
+# ---------------------------------------------------------------------------
+# ICD Excel upload
+# ---------------------------------------------------------------------------
+
+
+@router.post("/icd-xlsx", response_model=ICDImportResponse)
+async def upload_icd_xlsx(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    user: User = Depends(get_current_user),
+):
+    """Upload a filled-in ICD coding Excel template.
+
+    Expects columns: Case_ID (col 1), ICD (col 7). Accessible to both
+    admin and dak_mitarbeiter users.
+    """
+    if not file.filename or not file.filename.lower().endswith((".xlsx", ".xls")):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="File must be an Excel file (.xlsx)",
+        )
+
+    content = await file.read()
+    if len(content) > settings.MAX_UPLOAD_SIZE:
+        raise HTTPException(
+            status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
+            detail=f"File exceeds maximum size of {settings.MAX_UPLOAD_SIZE // (1024 * 1024)}MB",
+        )
+
+    try:
+        result = import_icd_from_xlsx(db, content, user.id)
+    except Exception as exc:
+        logger.exception("ICD xlsx import failed for %s", file.filename)
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"ICD import failed: {exc}",
+        )
+
+    # Log the import
+    log = ImportLog(
+        filename=file.filename,
+        import_type="icd_xlsx",
+        cases_imported=0,
+        cases_skipped=0,
+        cases_updated=result["updated"],
+        errors="; ".join(result["errors"]) if result["errors"] else None,
+        imported_by=user.id,
+    )
+    db.add(log)
+    db.commit()
+
+    return ICDImportResponse(**result)
+
+
+# ---------------------------------------------------------------------------
+# Historical Excel upload (placeholder — full logic in Task 12)
+# ---------------------------------------------------------------------------
+
+
+@router.post("/historical", response_model=ImportResult)
+async def upload_historical_excel(
+    file: UploadFile = File(...),
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Upload the Abrechnung_DAK.xlsx for historical data import (admin only).
+
+    This is a placeholder endpoint. The full import logic will be
+    implemented in Task 12.
+    """
+    if not file.filename or not file.filename.lower().endswith((".xlsx", ".xls")):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="File must be an Excel file (.xlsx)",
+        )
+
+    content = await file.read()
+    if len(content) > settings.MAX_UPLOAD_SIZE:
+        raise HTTPException(
+            status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
+            detail=f"File exceeds maximum size of {settings.MAX_UPLOAD_SIZE // (1024 * 1024)}MB",
+        )
+
+    # TODO: Implement historical import in Task 12
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail="Historical Excel import is not yet implemented",
+    )
+
+
+# ---------------------------------------------------------------------------
+# Import log (history)
+# ---------------------------------------------------------------------------
+
+
+@router.get("/log", response_model=ImportLogListResponse)
+def get_import_log(
+    page: int = Query(1, ge=1),
+    per_page: int = Query(20, ge=1, le=100),
+    import_type: Optional[str] = Query(None),
+    db: Session = Depends(get_db),
+    user: User = Depends(require_admin),
+):
+    """Return a paginated list of past imports (admin only)."""
+    query = db.query(ImportLog)
+
+    if import_type:
+        query = query.filter(ImportLog.import_type == import_type)
+
+    total = query.count()
+    items = (
+        query.order_by(ImportLog.imported_at.desc())
+        .offset((page - 1) * per_page)
+        .limit(per_page)
+        .all()
+    )
+
+    return ImportLogListResponse(
+        items=items,
+        total=total,
+        page=page,
+        per_page=per_page,
+    )
diff --git a/backend/app/schemas/case.py b/backend/app/schemas/case.py
new file mode 100644
index 0000000..8cec581
--- /dev/null
+++ b/backend/app/schemas/case.py
@@ -0,0 +1,125 @@
+"""Pydantic schemas for case list, detail, update, ICD, and coding endpoints."""
+
+from datetime import date, datetime
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class CaseResponse(BaseModel):
+    """Full representation of a case returned by list and detail endpoints."""
+
+    id: int
+    fall_id: Optional[str] = None
+    crm_ticket_id: Optional[str] = None
+    jahr: int
+    kw: int
+    datum: date
+    anrede: Optional[str] = None
+    vorname: Optional[str] = None
+    nachname: str
+    geburtsdatum: Optional[date] = None
+    kvnr: Optional[str] = None
+    versicherung: str
+    icd: Optional[str] = None
+    fallgruppe: str
+    strasse: Optional[str] = None
+    plz: Optional[str] = None
+    ort: Optional[str] = None
+    email: Optional[str] = None
+    ansprechpartner: Optional[str] = None
+    telefonnummer: Optional[str] = None
+    mobiltelefon: Optional[str] = None
+    unterlagen: bool
+    unterlagen_verschickt: Optional[date] = None
+    erhalten: Optional[bool] = None
+    unterlagen_erhalten: Optional[date] = None
+    unterlagen_an_gutachter: Optional[date] = None
+    gutachten: bool
+    gutachter: Optional[str] = None
+    gutachten_erstellt: Optional[date] = None
+    gutachten_versendet: Optional[date] = None
+    schweigepflicht: bool
+    ablehnung: bool
+    abbruch: bool
+    abbruch_datum: Optional[date] = None
+    gutachten_typ: Optional[str] = None
+    therapieaenderung: Optional[str] = None
+    ta_diagnosekorrektur: bool
+    ta_unterversorgung: bool
+    ta_uebertherapie: bool
+    kurzbeschreibung: Optional[str] = None
+    fragestellung: Optional[str] = None
+    kommentar: Optional[str] = None
+    sonstiges: Optional[str] = None
+    abgerechnet: bool
+    abrechnung_datum: Optional[date] = None
+    import_source: Optional[str] = None
+    imported_at: datetime
+    updated_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class CaseListResponse(BaseModel):
+    """Paginated case list response."""
+
+    items: list[CaseResponse]
+    total: int
+    page: int
+    per_page: int
+
+
+class CaseUpdate(BaseModel):
+    """Partial update for case fields (admin only).
+
+    All fields are optional; only provided fields are applied.
+    """
+
+    anrede: Optional[str] = None
+    vorname: Optional[str] = None
+    nachname: Optional[str] = None
+    geburtsdatum: Optional[date] = None
+    kvnr: Optional[str] = None
+    strasse: Optional[str] = None
+    plz: Optional[str] = None
+    ort: Optional[str] = None
+    email: Optional[str] = None
+    ansprechpartner: Optional[str] = None
+    telefonnummer: Optional[str] = None
+    mobiltelefon: Optional[str] = None
+    unterlagen: Optional[bool] = None
+    unterlagen_verschickt: Optional[date] = None
+    erhalten: Optional[bool] = None
+    unterlagen_erhalten: Optional[date] = None
+    unterlagen_an_gutachter: Optional[date] = None
+    gutachten: Optional[bool] = None
+    gutachter: Optional[str] = None
+    gutachten_erstellt: Optional[date] = None
+    gutachten_versendet: Optional[date] = None
+    schweigepflicht: Optional[bool] = None
+    ablehnung: Optional[bool] = None
+    abbruch: Optional[bool] = None
+    abbruch_datum: Optional[date] = None
+    kurzbeschreibung: Optional[str] = None
+    fragestellung: Optional[str] = None
+    kommentar: Optional[str] = None
+    sonstiges: Optional[str] = None
+    abgerechnet: Optional[bool] = None
+    abrechnung_datum: Optional[date] = None
+
+
+class ICDUpdate(BaseModel):
+    """Payload for setting ICD codes on a case."""
+
+    icd: str
+
+
+class CodingUpdate(BaseModel):
+    """Payload for setting coding/gutachten classification on a case."""
+
+    gutachten_typ: str  # "Bestätigung" or "Alternative"
+    therapieaenderung: str  # "Ja" or "Nein"
+    ta_diagnosekorrektur: bool = False
+    ta_unterversorgung: bool = False
+    ta_uebertherapie: bool = False