Hi 8701CAMINO!
Great question!
00170 = Anesthesia for intraoral procedures, including biopsy; not otherwise specified
99148-99150 = Moderate sedation services (other than those services described by codes 00100-01999) provided by a physician other than the health care professional performing the diagnostic or therapeutic service that the sedation supports [includes codes 99148, 99149, 99150]
So basically....the 00170 should only be used when there isn't another code that directly describes the service, due to the language in the description: "not otherwise specified"
But, you may look into the modifier "AA" to signify the service done by the anesthesiologist, the description of this modifier is: AA = Anesthesia services personally performed by the anesthesiologist
Here is a link to a sample medical policy from Empire Blue that does a good job of outlining the criteria:
http://www.empireblue.com/medicalpolicies/guidelines/gl_pw_c159214.htm Hope this helps! Let us know if you have any further questions!