2027 ICD-10-CM Diagnosis Code K63.3Ulcer of intestine
ICD-10-CM Codes›K00–K95›K55-K64›K63
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K63.3 is a billable ICD-10-CM diagnosis code for ulcer of intestine. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 1 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aphthous ulcer of large intestine
- Bleeding ulcer of large intestine
- Bleeding ulcer of mucosa of large intestine
- Celiac disease
- Celiac disease with diffuse ulcer of intestine
- Chronic enteropathy associated with SLCO2A1 gene
- Chronic non-specific multiple ulcers of small intestine
- Cryptogenic multifocal ulcerous stenosing enteritis
- Diffuse ulcer of jejunum and/or ileum
- Erosion of mucous membrane of large intestine
- Hemorrhagic mucosa of large intestine
- Idiopathic multiple ulcers of small intestine
- Ileal ulcer
- Non-infective ulcer of small intestine
- Non-infective ulcer of small intestine due to autoimmune disease
- Primary ulcer of small intestine
- Proximal colon ulcer
- Sigmoid colon ulcer
- Stercoral ulcer of large intestine
- Superficial ulcer of mucous membrane of large intestine
- Traumatic ulcer of small intestine
- Ulcer of cecum
- Ulcer of colon
- Ulcer of intestine
- Ulcer of intestine due to graft-versus-host disease
- Ulcer of intestine due to immunoglobulin A vasculitis
- Ulcer of large intestine
- Ulcer of mucosa of large intestine
- Ulcer of small intestine
- Ulcer of small intestine caused by foreign body
- Ulcer of small intestine caused by ionizing radiation
- Ulcer of small intestine due to Behcet syndrome
- Ulcerated mucosa of colon
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K63.3: its own notes plus those printed at Chapter 11. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Primary ulcer of small intestine
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name K63.3, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Colonic Diseases
Your colon, also known as the large intestine, is part of your digestive system. It's a long, hollow tube at the end of your digestive tract where your body makes and stores stool. Many disorders affect the colon's ability to work properly. Some of these include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K63.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K63.3Overview
What is the ICD-10 code for ulcer of intestine?
The ICD-10-CM code for ulcer of intestine is K63.3 (sometimes written as K633). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K63.3 (Other diseases of intestine) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report ulcer of intestine on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K63.3 group to?
When ulcer of intestine is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K63.3 a CC or MCC?
CMS lists K63.3 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 1 closely related codes in its exclusion list.
Can K63.3 be reported with a code from K26?
Not as a rule. The Excludes1 note on K63.3 lists "duodenal ulcer (K26.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
