diff --git a/modules/turnero/api/buscar_cie10.php b/modules/turnero/api/buscar_cie10.php
new file mode 100644
index 0000000..4479234
--- /dev/null
+++ b/modules/turnero/api/buscar_cie10.php
@@ -0,0 +1,22 @@
+<?php
+require_once __DIR__ . '/_helpers.php';
+requireMethod('GET');
+requireTurnero();
+
+$q = trim($_GET['q'] ?? '');
+if (strlen($q) < 2) { jsonOk(['items' => []]); }
+
+$pdo  = db();
+$like = '%' . $q . '%';
+
+// Código exacto primero, luego coincidencias por descripción
+$stmt = $pdo->prepare(
+    "SELECT cod_diag, concepto
+       FROM cie10_diagnosticos
+      WHERE cod_diag LIKE ? OR concepto LIKE ?
+      ORDER BY CASE WHEN cod_diag LIKE ? THEN 0 ELSE 1 END, cod_diag
+      LIMIT 12"
+);
+$stmt->execute([$like, $like, $like]);
+
+jsonOk(['items' => $stmt->fetchAll(PDO::FETCH_ASSOC)]);
diff --git a/modules/turnero/views/recepcion.php b/modules/turnero/views/recepcion.php
index fc6a392..ebbaea8 100644
--- a/modules/turnero/views/recepcion.php
+++ b/modules/turnero/views/recepcion.php
@@ -796,7 +796,15 @@ document.addEventListener('DOMContentLoaded', function() {
                     <div id="wrap-diag" class="d-none mt-2">
                         <label class="form-label mb-1 small fw-semibold">Diagnóstico (CIE-10)</label>
                         <input type="text" id="inp-diag" class="form-control form-control-sm"
-                               placeholder="Código CIE-10 diagnóstico principal" maxlength="20">
+                               placeholder="Código o descripción CIE-10…"
+                               autocomplete="off"
+                               oninput="buscarDiag()"
+                               onblur="setTimeout(()=>document.getElementById('diag-resultados').classList.add('d-none'),150)"
+                               onkeydown="if(event.key==='Enter'&&_diagResultados.length){event.preventDefault();seleccionarDiag(_diagResultados[0].cod_diag,_diagResultados[0].concepto);}">
+                        <div class="position-relative">
+                            <ul id="diag-resultados" class="list-unstyled mb-0 border rounded bg-white shadow-sm position-absolute w-100 d-none"
+                                style="z-index:200;max-height:200px;overflow-y:auto;top:2px"></ul>
+                        </div>
                     </div>
 
                     <!-- Tabla de precios calculados -->
@@ -1133,7 +1141,7 @@ document.addEventListener('DOMContentLoaded', () => {
     examTS = new TomSelect('#sel-examenes', {
         plugins: ['remove_button'],
         maxOptions: null,
-        selectOnTab: true,
+        selectOnTab: false,
 
         onItemAdd() { recalcularPrecios(); examTS.setTextboxValue(''); examTS.refreshOptions(false); },
         onItemRemove: () => recalcularPrecios(),
@@ -2355,6 +2363,37 @@ function quitarEmpresa() {
     document.getElementById('inp-diag').value = '';
 }
 
+// ── CIE-10 autocomplete ───────────────────────────────────────
+let _diagTimer = null, _diagResultados = [];
+function buscarDiag() {
+    clearTimeout(_diagTimer);
+    _diagTimer = setTimeout(_doDiagSearch, 250);
+}
+async function _doDiagSearch() {
+    const q  = document.getElementById('inp-diag').value.trim();
+    const ul = document.getElementById('diag-resultados');
+    if (q.length < 2) { ul.classList.add('d-none'); return; }
+    const res = await fetch(`${API}buscar_cie10.php?q=${encodeURIComponent(q)}`);
+    const j   = await res.json();
+    _diagResultados = j.items || [];
+    if (!_diagResultados.length) {
+        ul.innerHTML = '<li class="px-3 py-2 text-muted small">Sin resultados</li>';
+        ul.classList.remove('d-none'); return;
+    }
+    ul.innerHTML = _diagResultados.map((d, i) => `
+        <li class="px-3 py-2" style="cursor:pointer;border-bottom:1px solid #f1f5f9"
+            onmousedown="seleccionarDiag(${JSON.stringify(d.cod_diag)},${JSON.stringify(d.concepto)})">
+            <span class="fw-semibold small">${escHtml(d.cod_diag)}</span>
+            <span class="text-muted small ms-2">${escHtml(d.concepto)}</span>
+        </li>`).join('');
+    ul.classList.remove('d-none');
+}
+function seleccionarDiag(cod, concepto) {
+    document.getElementById('inp-diag').value = cod;
+    document.getElementById('diag-resultados').classList.add('d-none');
+    _diagResultados = [];
+}
+
 // ── Motor de precios ──────────────────────────────────────────
 let _recalcTimer;
 let _preciosActivos = [];