All ICD10 Codes

N91

Non-Billable
ChapterN00–N99
Rankcategory
Official Description

Absent, scanty and rare menstruation

Use a more specific code (6 billable)
N91.0Primary amenorrheaN91.1Secondary amenorrheaN91.2Amenorrhea, unspecifiedN91.3Primary oligomenorrheaN91.4Secondary oligomenorrheaN91.5Oligomenorrhea, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 14: Diseases of the Genitourinary System (N00-N99).

CH14 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • ovarian dysfunction (E28.-)

Clinical Hierarchy

BillableHas subcodes
CH14Diseases of the genitourinary system (N00-N99)
N80-N98Noninflammatory disorders of female genital tract (N80-N98)
N91Absent, scanty and rare menstruationNot billable
N91.0Primary amenorrheaBillable
N91.1Secondary amenorrheaBillable
N91.2Amenorrhea, unspecifiedBillable
N91.3Primary oligomenorrheaBillable
N91.4Secondary oligomenorrheaBillable
N91.5Oligomenorrhea, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N91:

chapterCH14
Diseases of the genitourinary system (N00-N99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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