2020 ICD-10-CM Diagnosis Code K51

Ulcerative colitis

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • K51 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 K51 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of K51 - other international versions of ICD-10 K51 may differ.
Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code to identify manifestations, such as:
  • pyoderma gangrenosum (
    ICD-10-CM Diagnosis Code L88

    Pyoderma gangrenosum

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Phagedenic pyoderma
    Type 1 Excludes
    • dermatitis gangrenosa (L08.0)
    L88
    )
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 K51. 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.
  • Crohn's disease [regional enteritis] (
    ICD-10-CM Diagnosis Code K50
    • K50 Crohn's disease [regional enteritis]
      • K50.0 Crohn's disease of small intestine
        • K50.00 Crohn's disease of small intestine without co...
        • K50.01 Crohn's disease of small intestine with compl...
          • K50.011 Crohn's disease of small intestine with recta...
          • K50.012 Crohn's disease of small intestine with intes...
          • K50.013 Crohn's disease of small intestine with fistu...
          • K50.014 Crohn's disease of small intestine with absce...
          • K50.018 Crohn's disease of small intestine with other...
          • K50.019 Crohn's disease of small intestine with unspe...
      • K50.1 Crohn's disease of large intestine
        • K50.10 Crohn's disease of large intestine without co...
        • K50.11 Crohn's disease of large intestine with compl...
          • K50.111 Crohn's disease of large intestine with recta...
          • K50.112 Crohn's disease of large intestine with intes...
          • K50.113 Crohn's disease of large intestine with fistu...
          • K50.114 Crohn's disease of large intestine with absce...
          • K50.118 Crohn's disease of large intestine with other...
          • K50.119 Crohn's disease of large intestine with unspe...
      • K50.8 Crohn's disease of both small and large intes...
        • K50.80 Crohn's disease of both small and large intes...
        • K50.81 Crohn's disease of both small and large intes...
          • K50.811 Crohn's disease of both small and large intes...
          • K50.812 Crohn's disease of both small and large intes...
          • K50.813 Crohn's disease of both small and large intes...
          • K50.814 Crohn's disease of both small and large intes...
          • K50.818 Crohn's disease of both small and large intes...
          • K50.819 Crohn's disease of both small and large intes...
      • K50.9 Crohn's disease, unspecified
        • K50.90 Crohn's disease, unspecified, without complic...
        • K50.91 Crohn's disease, unspecified, with complicati...
          • K50.911 Crohn's disease, unspecified, with rectal ble...
          • K50.912 Crohn's disease, unspecified, with intestinal...
          • K50.913 Crohn's disease, unspecified, with fistula
          • K50.914 Crohn's disease, unspecified, with abscess
          • K50.918 Crohn's disease, unspecified, with other comp...
          • K50.919 Crohn's disease, unspecified, with unspecifie...
    K50.-
    )
The following code(s) above K51 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 K51:
  • K00-K95
    2020 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
  • K50-K52
    2020 ICD-10-CM Range K50-K52

    Noninfective enteritis and colitis

    Includes
    • noninfective inflammatory bowel disease
    Type 1 Excludes
    Noninfective enteritis and colitis
Clinical Information
  • An inflammatory bowel disease involving the mucosal surface of the large intestine and rectum. It may present with an acute or slow onset and follows an intermittent or continuous course. Signs and symptoms include abdominal pain, diarrhea, fever, weight loss, and intestinal hemorrhage.
  • Chronic inflammation of the colon that produces ulcers in its lining. This condition is marked by abdominal pain, cramps, and loose discharges of pus, blood, and mucus from the bowel.
  • Chronic, recurrent ulceration of the colon mucosa and submucosa.
  • Inflammation of the colon that is predominantly confined to the mucosa. Its major symptoms include diarrhea, rectal bleeding, the passage of mucus, and abdominal pain.
  • Ulcerative colitis is a disease that causes ulcers in the lining of the rectum and colon. It is one of a group of diseases called inflammatory bowel disease. Ulcers form where inflammation has killed the cells that usually line the colon. Ulcerative colitis can happen at any age, but it usually starts between the ages of 15 and 30. It tends to run in families. The most common symptoms are pain in the abdomen and bloody diarrhea. Other symptoms may include anemia, severe tiredness, weight loss, loss of appetite, bleeding from the rectum, sores on the skin and joint pain. Children with the disease may have growth problems. About half of people with ulcerative colitis have mild symptoms. Several types of drugs can help control ulcerative colitis. Some people have long periods of remission, when they are free of symptoms. In severe cases, doctors must remove the colon.
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 K51:
  • Code Also: M08
    , M07
    ICD-10-CM Diagnosis Code M08

    Juvenile arthritis

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated underlying condition, such as:
    • regional enteritis [Crohn's disease] (K50.-)
    • ulcerative colitis (K51.-)
    Type 1 Excludes
    • arthropathy in Whipple's disease (M14.8)
    • Felty's syndrome (M05.0)
    • juvenile dermatomyositis (M33.0-)
    • psoriatic juvenile arthropathy (L40.54)
    ICD-10-CM Diagnosis Code M07

    Enteropathic arthropathies

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • associated enteropathy, such as:
    • regional enteritis [Crohn's disease] (K50.-)
    • ulcerative colitis (K51.-)
    Type 1 Excludes
    • psoriatic arthropathies (L40.5-)
  • Code First: F54
    ICD-10-CM Diagnosis Code F54

    Psychological and behavioral factors associated with disorders or diseases classified elsewhere

      2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
    Applicable To
    • Psychological factors affecting physical conditions
    Code First
    • the associated physical disorder, such as:
    • asthma (J45.-)
    • dermatitis (L23-L25)
    • gastric ulcer (K25.-)
    • mucous colitis (K58.-)
    • ulcerative colitis (K51.-)
    • urticaria (L50.-)
    Type 2 Excludes
    • tension-type headache (G44.2)
  • Type 1 Excludes: K50
    , K62.6
    , K63.3
    ICD-10-CM Diagnosis Code K50

    Crohn's disease [regional enteritis]

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • granulomatous enteritis
    Type 1 Excludes
    • ulcerative colitis (K51.-)
    Use Additional
    • code to identify manifestations, such as:
    • pyoderma gangrenosum (L88)
    ICD-10-CM Diagnosis Code K62.6

    Ulcer of anus and rectum

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Solitary ulcer of anus and rectum
    • Stercoral ulcer of anus and rectum
    Type 1 Excludes
    • fissure and fistula of anus and rectum (K60.-)
    • ulcerative colitis (K51.-)
    ICD-10-CM Diagnosis Code K63.3

    Ulcer of intestine

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Primary ulcer of small intestine
    Type 1 Excludes
    • duodenal ulcer (K26.-)
    • gastrointestinal ulcer (K28.-)
    • gastrojejunal ulcer (K28.-)
    • jejunal ulcer (K28.-)
    • peptic ulcer, site unspecified (K27.-)
    • ulcer of intestine with perforation (K63.1)
    • ulcer of anus or rectum (K62.6)
    • ulcerative colitis (K51.-)
ICD-10-CM Codes Adjacent To K51
K50.819 Crohn's disease of both small and large intestine with unspecified complications
K50.9 Crohn's disease, unspecified
K50.90 …… without complications
K50.91 Crohn's disease, unspecified, with complications
K50.911 Crohn's disease, unspecified, with rectal bleeding
K50.912 Crohn's disease, unspecified, with intestinal obstruction
K50.913 Crohn's disease, unspecified, with fistula
K50.914 Crohn's disease, unspecified, with abscess
K50.918 Crohn's disease, unspecified, with other complication
K50.919 Crohn's disease, unspecified, with unspecified complications
K51 Ulcerative colitis
K51.0 Ulcerative (chronic) pancolitis
K51.00 …… without complications
K51.01 Ulcerative (chronic) pancolitis with complications
K51.011 Ulcerative (chronic) pancolitis with rectal bleeding
K51.012 Ulcerative (chronic) pancolitis with intestinal obstruction
K51.013 Ulcerative (chronic) pancolitis with fistula
K51.014 Ulcerative (chronic) pancolitis with abscess
K51.018 Ulcerative (chronic) pancolitis with other complication
K51.019 Ulcerative (chronic) pancolitis with unspecified complications
K51.2 Ulcerative (chronic) proctitis

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