N91.4 ICD-10-CA code: Secondary oligomenorrhoea
N91.4 is the ICD-10-CA code for “Secondary oligomenorrhoea” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
N91.4Secondary oligomenorrhoea
ICD-10-CA · Canada · Also written N914
Index terms
Entries in CIHI’s alphabetical index that lead to N91.4. Searching the index by the condition the note names is how coders reach this code.
- Oligomenorrhea, secondary
Notes for N91.4
As CIHI prints them, with any note N91.4 takes from the headings above it.
Includes
- Scanty and rare menstruation in a woman with previously normal periods.
Excludes
Conditions classified elsewhere.
- Ovarian dysfunction (E28.-)From N91 Absent, scanty and rare menstruation
- Certain conditions originating in the perinatal period (P00-P96)certain infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 14: Diseases of the genitourinary system (N00-N99)
Where N91.4 sits
- 1ChapterChapter 14: Diseases of the genitourinary system (N00-N99)
- 2Block N80-N98Noninflammatory disorders of female genital tract
- 3Category N91Absent, scanty and rare menstruation
- 4Valid code N91.4Secondary oligomenorrhoea
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code N91.4 mean?
N91.4 is the ICD-10-CA code for “Secondary oligomenorrhoea” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is N91.4 in ICD-10-CA?
N91.4 sits under N91 Absent, scanty and rare menstruation, within N80-N98 Noninflammatory disorders of female genital tract, within Chapter 14: Diseases of the genitourinary system (N00-N99).
What coding notes apply to N91.4?
ICD-10-CA lists Includes, Excludes notes for N91.4, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.