2020 ICD-10-CM Diagnosis Code N91.5

Oligomenorrhea, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • N91.5 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM N91.5 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N91.5 - other international versions of ICD-10 N91.5 may differ.
Applicable To
  • Hypomenorrhea NOS
The following code(s) above N91.5 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to N91.5:
  • N00-N99
    2020 ICD-10-CM Range N00-N99

    Diseases of the genitourinary system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the genitourinary system
  • N91
    ICD-10-CM Diagnosis Code N91

    Absent, scanty and rare menstruation

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • ovarian dysfunction (E28.-)
    Absent, scanty and rare menstruation
Approximate Synonyms
  • Oligomenorrhea
  • Oligomenorrhea (infrequent menstruation)
Clinical Information
  • Abnormally infrequent menstruation.
ICD-10-CM N91.5 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 742 Uterine and adnexa procedures for non-malignancy with cc/mcc
  • 743 Uterine and adnexa procedures for non-malignancy without cc/mcc
  • 760 Menstrual and other female reproductive system disorders with cc/mcc
  • 761 Menstrual and other female reproductive system disorders without cc/mcc

Convert N91.5 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to N91.5:
  • Type 1 Excludes: N92.6
    ICD-10-CM Diagnosis Code N92.6

    Irregular menstruation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Irregular bleeding NOS
    • Irregular periods NOS
    Type 1 Excludes
    • irregular menstruation with:
    • lengthened intervals or scanty bleeding (N91.3-N91.5)
    • shortened intervals or excessive bleeding (N92.1)

Diagnosis Index entries containing back-references to N91.5:

ICD-10-CM Codes Adjacent To N91.5
N90.813 Female genital mutilation Type III status
N90.818 Other female genital mutilation status
N90.89 Other specified noninflammatory disorders of vulva and perineum
N90.9 Noninflammatory disorder of vulva and perineum, unspecified
N91 Absent, scanty and rare menstruation
N91.0 Primary amenorrhea
N91.1 Secondary amenorrhea
N91.2 Amenorrhea, unspecified
N91.3 Primary oligomenorrhea
N91.4 Secondary oligomenorrhea
N91.5 Oligomenorrhea, unspecified
N92 Excessive, frequent and irregular menstruation
N92.0 Excessive and frequent menstruation with regular cycle
N92.1 Excessive and frequent menstruation with irregular cycle
N92.2 Excessive menstruation at puberty
N92.3 Ovulation bleeding
N92.4 Excessive bleeding in the premenopausal period
N92.5 Other specified irregular menstruation
N92.6 Irregular menstruation, unspecified
N93 Other abnormal uterine and vaginal bleeding
N93.0 Postcoital and contact bleeding

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.