Checked qresear.ch and could not find a reference to this, so a pure spitball. Could [1-99] be Dept. of Justice Criminal Resource Manual (CRM) codes?
The codes include such things as (partial list):
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Aircraft Sabotage (18 U.S.C. § 32)
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Violence at International Airports (18 U.S.C. § 37)
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Crimes Against Immediate Family of All Federal Officials (18 U.S.C. § 115)
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Crimes Against Internationally Protected Persons (18 U.S.C. § § 112, 878, 1116, 1201(a)(4))
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Crimes Against Select United States Officials (18 U.S.C. § § 111, 351, 1114, 1201(a)(5), 1751)
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Murder-for-Hire (18 U.S.C. § 1958)
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Crimes Committed Within the Special Maritime Jurisdiction of the United States (18 U.S.C. § § 7, 113, 114, 1111, 1112, 1201, 2031, 2111)
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Sea Piracy (18 U.S.C. § 1651)
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Hostage Taking (18 U.S.C. § 1203)
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Terrorist Acts Abroad Against United States Nationals (18 U.S.C. § 2332)
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Terrorism Transcending National Boundaries (18 U.S.C. § 2332b)
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Conspiracy Within the United States to Murder, Kidnap, or Maim Persons or to Damage Certain Property Overseas (18 U.S.C. § 956)
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Providing Material Support to Terrorists (18 U.S.C. § 2339A)
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Providing Material Support to Designated Terrorist Organizations (Fundraising) (18 U.S.C. § 2339B)
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Use of Biological, Nuclear, Chemical or Other Weapons of Mass Destruction (18 U.S.C. § § 175, 831, 2332c, 2332a)
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International Traffic in Arms Regulations
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Genocide (18 U.S.C. § 1091)
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Torture (18 U.S.C. § 2340A)
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Notice of Appeal Form
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Motion for Extension of Time to Petition for Rehearing
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28 C.F.R. § 50.9 Policy With Regard to Open Judicial Proceedings
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Release and Detention Pending Judicial Proceedings (18 U.S.C. § § 3141 et seq.) 9-6.100
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Electronic Surveillance 9-7.010
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Electronic Surveillance—Title III Applications 9-7.111
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Electronic Surveillance—Title III Affidavits 90
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Electronic Surveillance—Title III Orders
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Electronic Surveillance—Statutory Authority and Legislative History 9-7.100
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Video Surveillance—Use of Closed-Circuit Television (CCTV) 9-7.200
https://www.justice.gov/jm/crm-1-99