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@@ -73,3 +73,21 @@ A documented JSON search API also exists at
 Descriptions are the official German ICD-10-GM labels as published on the
 portal. Provided for research; verify against the official BfArM/DIMDI
 classification for clinical or billing use.
+
+
+## Companion file: top ICD codes by specialty
+
+`top_icd_by_specialty_2024q1.json` — the most frequent ICD-10 categories per
+ambulatory care specialty in **KV Nordrhein, Q1/2024** (source: KV Nordrhein
+"Die 100 häufigsten ICD-10-Schlüssel und Kurztexte"), joined to the canonical
+German descriptions and `body_text` of this dataset on the 3-character ICD
+category.
+
+Shape: `{quarter, n_specialties: 21, specialties: [{care, codes: [...]}]}`, where
+each code has `rank`, `icd`, `anteil_pct` (share of cases in %), `kurztext` (KV
+short label), `description` (official ICD-10-GM label), and `body_text`.
+
+Note: in the source, *Internisten (fachärztlich tätig)* and *Nervenheilkunde*
+are split into several unlabeled subspecialty lists; only the first list of each
+is kept here, so those two entries represent one subspecialty rather than a
+specialty-wide aggregate.