2021 ICD-10-CM Diagnosis Code K59.00

Constipation, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • K59.00 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM K59.00 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of K59.00 - other international versions of ICD-10 K59.00 may differ.
The following code(s) above K59.00 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 K59.00:
  • K00-K95
    2021 ICD-10-CM Range K00-K95

    Diseases of the digestive 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 digestive system
  • K59
    ICD-10-CM Diagnosis Code K59

    Other functional intestinal disorders

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • change in bowel habit NOS (R19.4)
    • intestinal malabsorption (K90.-)
    • psychogenic intestinal disorders (F45.8)
    Type 2 Excludes
    • functional disorders of stomach (K31.-)
    Other functional intestinal disorders
  • K59.0
    ICD-10-CM Diagnosis Code K59.0


      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
Approximate Synonyms
  • Atonic constipation
  • Constipation
  • Constipation due to neurogenic bowel
  • Constipation due to spasm of colon
  • Constipation in pregnancy
  • Constipation, atonic
  • Constipation, colonic
  • Constipation, neurogenic
  • Constipation, spastic
  • Dyschezia
  • Nutrition therapy for constipation done
  • Nutritional therapy for constipation
  • Obstipation
  • Pain associated with defecation
  • Slow transit constipation
Clinical Information
  • A condition in which stool becomes hard, dry, and difficult to pass, and bowel movements don't happen very often. Other symptoms may include painful bowel movements, and feeling bloated, uncomfortable, and sluggish.
  • A disorder characterized by irregular and infrequent or difficult evacuation of the bowels.
  • Condition in which bowel movements are infrequent or incomplete.
  • Constipation means that a person has three or fewer bowel movements in a week. The stool can be hard and dry. Sometimes it is painful to pass. At one time or another, almost everyone gets constipated. In most cases, it lasts a short time and is not serious. There are many things you can do to prevent constipation. They include
    • eating more fruits, vegetables and grains, which are high in fiber
    • drinking plenty of water and other liquids
    • getting enough exercise
    • taking time to have a bowel movement when you need to
    • using laxatives only if your doctor says you should
    • asking your doctor if medicines you take may cause constipation
    it's not important that you have a bowel movement every day. If your bowel habits change, however, check with your doctor.
  • Decrease in normal frequency of defecation accompanied by difficult or incomplete passage of stool and/or passage of excessively hard, dry stool
  • Difficult passage of hard, dry, feces
  • Infrequent or difficult evacuation of feces. These symptoms are associated with a variety of causes, including low dietary fiber intake, emotional or nervous disturbances, systemic and structural disorders, drug-induced aggravation, and infections.
  • Irregular and infrequent or difficult evacuation of the bowels.
ICD-10-CM K59.00 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 391 Esophagitis, gastroenteritis and miscellaneous digestive disorders with mcc
  • 392 Esophagitis, gastroenteritis and miscellaneous digestive disorders without mcc

Convert K59.00 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
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to K59.00:
  • Constipation (atonic) (neurogenic) (simple) (spastic) K59.00
  • Dyschezia K59.00

ICD-10-CM Codes Adjacent To K59.00
K57.92 Diverticulitis of intestine, part unspecified, without perforation or abscess without bleeding
K57.93 Diverticulitis of intestine, part unspecified, without perforation or abscess with bleeding
K58 Irritable bowel syndrome
K58.0 Irritable bowel syndrome with diarrhea
K58.1 Irritable bowel syndrome with constipation
K58.2 Mixed irritable bowel syndrome
K58.8 Other irritable bowel syndrome
K58.9 Irritable bowel syndrome without diarrhea
K59 Other functional intestinal disorders
K59.0 Constipation
K59.00 …… unspecified
K59.01 Slow transit constipation
K59.02 Outlet dysfunction constipation
K59.03 Drug induced constipation
K59.04 Chronic idiopathic constipation
K59.09 Other constipation
K59.1 Functional diarrhea
K59.2 Neurogenic bowel, not elsewhere classified
K59.3 Megacolon, not elsewhere classified
K59.31 Toxic megacolon
K59.39 Other megacolon

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