D.C. Mun. Regs. tit. 26, r. 26-A207
If any insurer or rating bureau making rate filings with the Commissioner of Insurance within the scope of Chapter 17 of Title 35 of the D.C. Code, 1981 ed., estimates the effects of inflation on its incurred or paid losses in any period, it shall for the same period fully reflect the effects of inflation on the sales of insurance and premiums earned or written.
No rate revision or rate schedule shall be approved by the Commissioner unless the effects of inflation are either omitted entirely from his or her consideration or are fully reflected in the data relating to sales of insurance, premiums, losses, and expenses.
Any agreement, by-law, rule, regulation or amendment thereto of a rating bureau, with respect to rate filings with the Commissioner, which is contrary to this section, shall be disapproved.
D.C. Mun. Regs. tit. 26, r. 26-A207