Is ICD-10-CM code N91 billable?

No, N91 (Absent, scanty and rare menstruation) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code N91 belong to?

N91 belongs to Chapter 14 of the ICD-10-CM tabular list: N00–N99 (Diseases of the Genitourinary System).

N91Not billable, use a more specific code below

Absent, scanty and rare menstruation

In Noninflammatory disorders of female genital tract (N80-N98), chapter 14: Diseases of the Genitourinary System

6 billable codes under N91: none are a CC or MCC; none map to an HCC.

Instructional notes

Excludes1: not coded here, use a different code

ovarian dysfunction (E28.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers chronic kidney disease staging, CKD in kidney transplant patients, and sequencing CKD with related conditions such as diabetes and hypertension.

Chronic kidney disease (page 62)

Read Section I.C.14 (page 62)

All codes under N91

N91 can't be used on a claim. Pick a billable code below; grey headings group them.

N91 MS-DRGs

As the principal diagnosis, all 6 billable codes under N91 group to MS-DRG 742, 743, 760, or 761 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Menstruation

Menstruation, also called a period, is normal vaginal bleeding that happens as part of the monthly cycle in women and girls. Every month, the body prepares for pregnancy. If pregnancy does not happen, the uterus (womb) sheds its lining. This blood and tissue leave the body through the vagina.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.