Structure of the NMAC

“The NMAC, a hierarchical structure, is divided into titles, chapters and parts, on the basis of subject matter. A title broadly organizes related governmental rule material in the first level of the hierarchy. The title is divided into chapters that identify distinct governmental functions. The chapter is divided into parts. The part relates to specific subject matter. It is at this level that rules are organized. The part is subdivided into sections. The section may be further subdivided into subsections, paragraphs and sub-paragraphs.” [Subsection A of NMAC]

Title Titles cover large subject areas or general aspects of government activity. A title is designated by a whole number from 1 to 22.
Chapter Chapters are more specific subject groupings organized by distinct governmental functions. A chapter is designated by a whole number from 1 to 999.
Part A part relates to a specific subject. The part is equal to the rule; in other words, the rule text is found at this level. A part is designated by a whole number from 1 to 9999.
Section The part [rule] is divided into sections. The first seven sections describe the part and are mandatory for every part [the first seven sections are: 1. issuing agency; 2. scope; 3. statutory authority; 4. duration; 5. effective date; 6. objective; and 7. definitions]. The rule text continues in Section 8. A section is designated by a whole number from 1 to 9999.
Subsection Sections may be divided into subsections which are designated by a capital letter from A to ZZZ.
Paragraph Subsections may be divided into paragraphs which are designated by a whole number in parentheses from (1) to (999).
Subparagraph Paragraphs may be divided into subparagraphs which are designated by a lower-case letter in parentheses from (a) to (zzz).

See Citing to the NMAC for more information on the proper way to designate specific levels in the NMAC hierarchy.