N91.4Billable

Secondary oligomenorrhea

Chapter
14. Diseases of the genitourinary system
Category
N91
Effective date
October 1, 2026

Related codes in category N91

N91Absent, scanty and rare menstruationN91.0Primary amenorrheaYesN91.1Secondary amenorrheaYesN91.2Amenorrhea, unspecifiedYesN91.3Primary oligomenorrheaYesN91.5Oligomenorrhea, unspecifiedYes

Frequently asked questions

What is ICD-10 code N91.4?

N91.4 is an ICD-10-CM diagnosis code for Secondary oligomenorrhea.

Is N91.4 a billable code?

Yes. N91.4 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is N91.4 in?

N91.4 falls under Chapter 14: Diseases of the genitourinary system.

When did N91.4 become effective?

N91.4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to N91.4?

N91.4 belongs to category N91, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.