N91
Non-billableAbsent, scanty and rare menstruation
Absent, scanty and rare menstruation
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
Child Codes (6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(1)
Frequently Asked Questions
What is the ICD-10 code for absent, scanty and rare menstruation?
The ICD-10-CM code for absent, scanty and rare menstruation is N91. The full clinical description is "Absent, scanty and rare menstruation". N91 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code N91 mean?
ICD-10-CM code N91 represents “Absent, scanty and rare menstruation”. It is classified under Chapter 14: Diseases of the Genitourinary System and is a non-billable header code. Use a more specific child code for billing purposes.
Is N91 a billable code?
No, N91 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 6 child codes under N91.
What chapter is N91 in?
N91 is in Chapter 14: Diseases of the Genitourinary System (codes N00-N99).
What codes cannot be used with N91?
N91 has Excludes1 notes indicating codes that cannot be used together with it, including: ovarian dysfunction (E28.-).
What are the subcategories under N91?
N91 has 6 child codes, including: N91.0 (Primary amenorrhea), N91.1 (Secondary amenorrhea), N91.2 (Amenorrhea, unspecified), N91.3 (Primary oligomenorrhea), and 2 more.
What are the UMLS CUIs for N91?
N91 is linked to 1 UMLS Concept Unique Identifier: C0495109. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does N91 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like absent, scanty and rare menstruation affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of N91?
N91 maps to the ICD-11 code: GA20.0Z (Amenorrhoea, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.