45 C.F.R. § 162.1000 General requirements.
Title 45 - Public Welfare
When conducting a transaction covered by this part, a covered entity must meet the following requirements: (a) Medical data code sets. Use the applicable medical data code sets described in §162.1002 as specified in the implementation specification adopted under this part that are valid at the time the health care is furnished. (b) Nonmedical data code sets. Use the nonmedical data code sets as described in the implementation specifications adopted under this part that are valid at the time the transaction is initiated.
Title 45: Public Welfare
PART 162—ADMINISTRATIVE REQUIREMENTS
Subpart J—Code Sets
§ 162.1000 General requirements.