The work I know of, I'm not in USA only have an interest in copyright laws in general, is Feist v Rural Telephone (1991) -- which appears to mirror codes for health procedures quite closely; but not exactly.
There's old but more recent law from Practice Management v AMA (1997) supporting that AMA's codes can't be copyrightable as they're part of legislation.
Berne's Art 2(8), to which USA are signed, related to non-copyright of facts.
I'm afraid I'm not appraised of the full situation, however.
Are you talking about copyright here? It sounds more like design protection.
Wouldn't the book be as copyrightable as any other non-fiction work?