DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N91 Absent, scanty and rare menstruation

  • Header · not billable

N91 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N80-N98 Noninflammatory disorders of female genital tract (N80-N98)
  3. N91 Absent, scanty and rare menstruation
Billable codes
6
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
9

Codes in N91

  1. N91.0
    Primary amenorrhea
    Billable
  2. N91.1
    Secondary amenorrhea
    Billable
  3. N91.2
    Amenorrhea, unspecified
    Billable
  4. N91.3
    Primary oligomenorrhea
    Billable
  5. N91.4
    Secondary oligomenorrhea
    Billable
  6. N91.5
    Oligomenorrhea, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Hypomenorrhea NOS

Sources of each column.

Instructions

At N91

Excludes1

  • ovarian dysfunction (E28.-) E28

Notes that also apply

Chapter 14 instructions (Excludes2 8): printed on the chapter 14 page.

Index entries

  • Amenorrhea → N91.2
  • Oligomenorrhea → N91.5
  • Amenorrheaprimary → N91.0
  • Delay, delayedmenstruation (cause unknown) → N91.0
  • Failure, failedmenstruation at puberty → N91.0
  • Menstruationdelayed → N91.0
  • Amenorrheasecondary → N91.1
  • Oligomenorrheaprimary → N91.3
  • Oligomenorrheasecondary → N91.4

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy