Some useful resources at the Meta-level:
Members of the Society for Participatory Medicine were especially helpful in answering my queries.
Twitter as always helps: @PracticalWisdom @RichDuszak @dlschermd @ElinSilveous @emilayamei and @Berci all provided some useful feedback and links.
Some of these tools require that you know the right codes. If you don't know the ICD or CPT code, just write the name of the procedure and add ICD-9 or CPT to the search criteria. You'll find it.
These were the tools I wound up using in my search
- New Choice Health
Not every procedure is covered, and they have limited coverage of various cities. If you live close enough to a big one, you'll find it. I wish they'd provide national level ranges for some procedures.
- Health Care Blue Book
Also missing a number of procedures, but has more than New Choice Health. The method by which fair price is determined isn't terribly transparent (to me at least), but the prices seem to be in line.
- AHRQ Healthcare Cost and Utilization Project
Hospital data only apparently. Still quite useful and an lot more detail than you might expect.
- Medicare Physician Fee Schedule Search
Non-hospital fees for various treatments and diagnostics. Useful but I wish there was a way to get min/max/average easily for a codes list or range
And then there's always Google.