Bì Fǎ 畢法 (zì Cānglín 蒼霖, fl. mid Qiánlóng – early Dàoguāng, 清), friend and surgical collaborator of 許克昌. Author of an unfinished two-juǎn draft titled Wàikē zhèngzhì 外科證治, which he was unable to complete before his death (before age thirty, per Xǔ’s preface). Xǔ Kèchāng took up the manuscript and, after some twenty-odd years of further clinical testing and expansion, produced the published KR3ek001 Wàikē zhèngzhì quánshū in 5 juǎn (1831). Bì’s contribution is the original Wàikē zhèngzhì kernel preserved as the core of juǎn 1–3 of the printed text. No further biographical record. Not in CBDB.