2027 ICD-10-CM Diagnosis Code K50.811Crohn's disease of both small and large intestine with rectal bleeding
ICD-10-CM Codes›K00–K95›K50-K52›K50
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 80
- Chronic Condition
K50.811 is a billable ICD-10-CM diagnosis code for Crohn's disease of both small and large intestine with rectal bleeding. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 385 through 387. 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 77 closely related codes. Coders also document this condition as complication due to Crohn's disease of large intestine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal hemorrhage and Regional enteritis and ulcerative colitis.
For Medicare Advantage risk adjustment, K50.811 maps to CMS-HCC Category 80 (Crohn's Disease (Regional Enteritis)) under the V28 model, adding a risk factor of about 0.550 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
K50.811 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Complication due to Crohn's disease of large intestine
- Complication due to Crohn's disease of small and large intestines
- Complication due to Crohn's disease of small intestine
- Rectal hemorrhage due to Crohn's disease
- Rectal hemorrhage due to Crohn's disease of large intestine
- Rectal hemorrhage due to Crohn's disease of small and large intestines
- Rectal hemorrhage due to Crohn's disease of small intestine
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K50.811: its own notes plus those printed at K50, block K50-K52, and Chapter 11. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- granulomatous enteritis
- noninfective inflammatory bowel disease
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)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name K50.811, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming K50.811: they are not reported together with it, unless the two conditions are unrelated.
- E55.0 Rickets, activeCrohn's rickets (K50.-) names K50.-, which includes this code
- K50.0 Crohn's disease of small intestineCrohn's disease of both small and large intestine (K50.8-) names K50.8-, which includes this code
- K50.1 Crohn's disease of large intestineCrohn's disease of both small and large intestine (K50.8) names K50.8, which includes this code
- K51 Ulcerative colitisCrohn's disease [regional enteritis] (K50.-) names K50.-, which includes this code
Excludes2 1
These codes carry an Excludes2 note naming K50.811: its condition is not part of those codes, and both may be reported when the patient has both.
Code First 3
These codes say to code first a condition named in the note, and K50.811 is one of the conditions named.
Code Also 2
These codes say K50.811 may also be needed to fully describe the condition. The note gives no sequencing direction.
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
Crohn's Disease
Crohn's disease is a chronic (long-lasting) disease that causes inflammation in your digestive tract. It can affect any part of your digestive tract, which runs from your mouth to your anus. But it usually affects your small intestine and the beginning of your large intestine.
The full article covers:
- What is Crohn's disease?
- What causes Crohn's disease?
- Who is more likely to develop Crohn's disease?
- What are the symptoms of Crohn's disease?
- What other problems can Crohn's disease cause?
- How is Crohn's disease diagnosed?
- What are the treatments for Crohn's disease?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K50.811 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K50.811Overview
What is the ICD-10 code for Crohn's disease of both small and large intestine with rectal bleeding?
The ICD-10-CM code for Crohn's disease of both small and large intestine with rectal bleeding is K50.811 (sometimes written as K50811). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K50.811 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report Crohn's disease of both small and large intestine with rectal bleeding on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K50.811 group to?
When Crohn's disease of both small and large intestine with rectal bleeding is the principal diagnosis on an inpatient stay, it groups to MS-DRG 385, 386, 387, with relative weights from 0.6462 to 1.5540 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K50.811 a CC or MCC?
CMS lists K50.811 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 77 closely related codes in its exclusion list.
Can K50.811 be reported with a code from K51?
Not as a rule. The Excludes1 note at K50, which applies to K50.811, lists "ulcerative colitis (K51.-)". 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).
What HCC is K50.811?
K50.811 (Crohn's disease of both small and large intestine with rectal bleeding) maps to CMS-HCC Category 80 (Crohn's Disease (Regional Enteritis)), commonly written as HCC 80, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 35 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 67.
Does K50.811 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, K50.811 adds a risk adjustment factor of about 0.550 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.374 to 0.651 depending on the payment segment). A more severe related category (HCC 77) supersedes it when both are reported. See the full factor table on the HCC 80 category page.
