Is N91.4 a billable ICD-10 code?

Yes. N91.4 (Secondary oligomenorrhea) is billable and can be used for insurance claims. Always verify payer-specific requirements.

N91.4 ✓ Billable

Secondary oligomenorrhea

Q: What is ICD-10 code N91.4?

ICD-10-CM code N91.4 stands for "Secondary oligomenorrhea". It is a billable code in the Diseases of the Genitourinary System chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Diseases of the Genitourinary System

Code

N91.4

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Diseases of the Genitourinary System

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code N91.4?

ICD-10-CM code N91.4 represents Secondary oligomenorrhea. It is a billable diagnosis code in the Diseases of the Genitourinary System chapter, effective October 1, 2025 – September 30, 2026.

Is N91.4 billable?

Yes. N91.4 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is N91.4 in?

N91.4 belongs to the Diseases of the Genitourinary System chapter (N00–N99) of ICD-10-CM.

Related codes in the N91 category

N91 Absent, scanty and rare menstruation Non-billable N91.0 Primary amenorrhea Billable N91.1 Secondary amenorrhea Billable N91.2 Amenorrhea, unspecified Billable N91.3 Primary oligomenorrhea Billable N91.5 Oligomenorrhea, unspecified Billable

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