Law firms in Washington, D.C., are increasingly focused on health care industry clients, finding lucrative work that spans from transactions and regulatory practices to lobbying shops.

For instance, Arnold & Porter Kaye Scholer was tapped this year by Pfizer to steer its $43 billion acquisition of cancer drug maker Seagen. Covington & Burling represented AstraZeneca in its $1.8 billion acquisition of CinCor Pharma Inc., a biopharmaceutical company.