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    v1.0.30
    OpenPayerBilling CodesNoninflammatory disorders of female genital tractICD-10-CM n91-absent-scanty-rare-menstruation
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    ICD-10-CM Code For Absent Scanty And Rare Menstruation: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N91 includes diagnoses for amenorrhea, hypomenorrhea, and oligomenorrhea, covering absent, scanty, and infrequent menstrual bleeding due to hormonal, structural, or systemic causes. These ICD-10-CM diagnosis codes are used to document patient presentations of altered menstrual patterns, capturing differences in menstrual frequency, volume, and clinical complexity relevant to gynecologic care. Accurate coding within the ICD-10-CM N91 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM N91: Absent, Scanty And Rare Menstruation Overview

    This group includes diagnoses for absent, scanty, or infrequent menstrual bleeding affecting the female reproductive system. These conditions target menstrual cycle disorders related to hormonal, structural, or functional causes and can impact gynecologic management. Accurate coding matters for appropriate clinical documentation and reimbursement because it reflects severity and guides claim adjudication.

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    When to Use

    Use a code from this group when documenting clinical encounters for patients presenting with absent, reduced, or infrequent menstrual bleeding without inflammatory causes. Select the code that best reflects the clinical description of menstrual frequency and volume documented in the medical record.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    N91.0Primary amenorrhea
    N91.1Secondary amenorrhea
    N91.2Amenorrhea, unspecified
    N91.3Primary oligomenorrhea
    N91.4Secondary oligomenorrhea
    N91.5Oligomenorrhea, unspecified

    DRG Codes

    4 rows

    DRG CodeDescription
    742Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC
    743Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC
    760Menstrual and Other Female Reproductive System Disorders with CC/MCC
    761Menstrual and Other Female Reproductive System Disorders without CC/MCC

    Typical Clinical Scenarios

    • A 17-year-old adolescent presents to primary care with a 9-month history of menstrual cycles that have progressively become very light and infrequent since menarche, with menses occurring every 60–90 days and cycles lasting only 1–2 days. She reports normal secondary sexual development and no significant weight change, and pregnancy test is negative; clinician documents persistent scanty menstruation due to oligomenorrhea without evidence of anatomic lesion, and assigns a code reflecting chronic scanty periods. Typical codes: N91.2, N91.4
    • A 38-year-old woman with a history of recent childbirth and exclusive breastfeeding comes to the clinic because she has not had a menstrual period for the past 6 months and desires evaluation for return of menses. Pregnancy test is negative; clinician attributes absent menstruation to lactational amenorrhea and records an absent menses diagnosis from this group as part of postpartum reproductive assessment. Typical codes: N91.0, N91.3
    • A 52-year-old perimenopausal patient reports increasingly irregular and very light bleeding over the past year with several months of complete absence of menses and new symptoms of vasomotor instability; workup excludes pregnancy and structural causes, and the absent or scanty menstruation is coded as part of her perimenopausal transition and management of related comorbidities. Typical codes: N91.1, N91.5

    Related Codes

    N80-ENDOMETRIOSIS

    ICD-10-CM Code For Endometriosis: Group Overview

    N81-FEMALE-GENITAL-PROLAPSE

    ICD-10-CM Code For Female Genital Prolapse: Group Overview

    N82-FISTULAE-INVOLVING-FEMALE-GENITAL-TRACT

    ICD-10-CM Code For Fistulae Involving Female Genital Tract: Group Overview

    N83-NONINFLAMMATORY-DISORDERS-OF-OVARY

    ICD-10-CM Code For Noninflammatory Disorders Of Ovary Fallopian Tube And Broad Ligament: Group Overview

    N84-POLYP-OF-FEMALE-GENITAL-TRACT

    ICD-10-CM Code For Polyp Of Female Genital Tract: Group Overview

    N85-OTHER-NONINFLAMMATORY-DISORDERS-OF-UTERUS

    ICD-10-CM Code For Other Noninflammatory Disorders Of Uterus Except Cervix: Group Overview

    N86-EROSION-AND-ECTROPION-OF-CERVIX-UTERI

    ICD-10-CM Code For Erosion And Ectropion Of Cervix Uteri: Group Overview

    N87-DYSPLASIA-OF-CERVIX-UTERI

    ICD-10-CM Code For Dysplasia Of Cervix Uteri: Group Overview

    N88-OTHER-NONINFLAMMATORY-DISORDERS-OF-CERVIX-UTERI

    ICD-10-CM Code For Other Noninflammatory Disorders Of Cervix Uteri: Group Overview

    N89-OTHER-NONINFLAMMATORY-DISORDERS-OF-VAGINA

    ICD-10-CM Code For Other Noninflammatory Disorders Of Vagina: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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