2020 ICD-10-CM Diagnosis Code N91

Absent, scanty and rare menstruation

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • N91 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM N91 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N91 - other international versions of ICD-10 N91 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as N91. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • ovarian dysfunction (
    ICD-10-CM Diagnosis Code E28
    • E28 Ovarian dysfunction
      • E28.0 Estrogen excess
      • E28.1 Androgen excess
      • E28.2 Polycystic ovarian syndrome
      • E28.3 Primary ovarian failure
        • E28.31 Premature menopause
          • E28.310 Symptomatic premature menopause
          • E28.319 Asymptomatic premature menopause
        • E28.39 Other primary ovarian failure
      • E28.8 Other ovarian dysfunction
      • E28.9 Ovarian dysfunction, unspecified
    E28.-
    )
The following code(s) above N91 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:
  • 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
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
ICD-10-CM Codes Adjacent To N91
N90.7 Vulvar cyst
N90.8 Other specified noninflammatory disorders of vulva and perineum
N90.81 Female genital mutilation status
N90.810 …… unspecified
N90.811 Female genital mutilation Type I status
N90.812 Female genital mutilation Type II status
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

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