Skip to main content

K50.911 ICD-10-CM Code: Crohn's disease, unspecified, with rectal bleeding

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
2 inclusion terms · 3 Excludes1 · 6 use-additional codes
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 35 · RxHCC V08 category 67

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 385 — INFLAMMATORY BOWEL DISEASE WITH MCC (MDC 06)
  • MS-DRG 386 — INFLAMMATORY BOWEL DISEASE WITH CC (MDC 06)
  • MS-DRG 387 — INFLAMMATORY BOWEL DISEASE WITHOUT CC/MCC (MDC 06)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 80 — Crohn's Disease (Regional Enteritis) (supersedes HCC 81)

Other models: CMS-HCC V22 HCC 35 · RxHCC V08 HCC 67

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for K50.911 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on K50.911 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • granulomatous enteritis inherited from K50
  • noninfective inflammatory bowel disease inherited from K50-K52

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify any associated fistulas, if applicable:
  • anal fistula (K60.3-)
  • anorectal fistula (K60.5-)
  • rectal fistula (K60.4-)
  • Use additional code to identify manifestations, such as:
  • pyoderma gangrenosum (L88)

Source: inherited from K50

Coder workflow for K50.911

MedCoder structured workflow — derived from this code’s own official record

Before you code K50.911

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, K50.911 may be the appropriate code. Check the record for detail that supports a more specific sibling — in this subcategory the siblings differ by the presence or absence of the associated condition. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. K50.911’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

    Guide: Combination codes →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with K50.911. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — K50.911 is appropriate when the documentation goes no further.
  2. Does the documentation support a condition named in K50.911’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewK51, K58, K59.3

Consider K50.911. Then work the Use Additional Code note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting K50.911(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with K50.911: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareK51, K58, K59.3

    See the official tabular notes · Guidelines I.A.12.a

  • Use Additional Code — after identifying K50.911(6 notes)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with K50.911 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewK60.3, K60.5, K60.4, L88

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the subcategory for a sibling that names the missing detail.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

Documentation: Both the condition K50.911 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewK51, K58, K59.3

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is K50.911 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse K50.911 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of K50.911 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • K51— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of ulcerative colitis moves the case to K51; the two are not reported together unless documented as unrelated.

    Full comparison: K50.911 vs K51 →

  • K58— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of irritable bowel syndrome moves the case to K58; the two are not reported together unless documented as unrelated.

    Full comparison: K50.911 vs K58 →

  • K59.3— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of megacolon moves the case to K59.3; the two are not reported together unless documented as unrelated.

    Full comparison: K50.911 vs K59.3 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Code Overview

Crohn's disease, unspecified, with rectal bleeding is a billable ICD-10-CM diagnosis code (K50.911).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Official Coding Guidelines

No excerpt in the ICD-10-CM Official Guidelines names this code specifically. Its chapter carries only this chapter-wide note:

Chapter 11: Diseases of the Digestive System (K00-K95)

Reserved for future guideline expansion

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name K50.911 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes1 notes across 2 chapters: E55.0 — Rickets, active (via K50.-), K51 — Ulcerative colitis (via K50.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: M04 — Autoinflammatory syndromes (via K50.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 3 Code First instructions: K60.3 — Anal fistula (via K50.-), K60.4 — Rectal fistula (via K50.-), K60.5 — Anorectal fistula (via K50.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 2 Code Also instructions: M07 — Enteropathic arthropathies (via K50.-), M08 — Juvenile arthritis (via K50.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 28 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 385 (MDC 06), DRG 386 (MDC 06), DRG 387 (MDC 06).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):DIG011 — Regional enteritis and ulcerative colitis (default); DIG021 — Gastrointestinal hemorrhage.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

K50.10 — Crohn's disease of large intestine without complications, K50.111 — Crohn's disease of large intestine with rectal bleeding, K50.112 — Crohn's disease of large intestine with intestinal obstruction, K50.113 — Crohn's disease of large intestine with fistula, K50.114 — Crohn's disease of large intestine with abscess, K50.118 — Crohn's disease of large intestine with other complication, K50.119 — Crohn's disease of large intestine with unspecified complications, K50.80 — Crohn's disease of both small and large intestine without complications, K50.811 — Crohn's disease of both small and large intestine with rectal bleeding, K50.812 — Crohn's disease of both small and large intestine with intestinal obstruction, K50.813 — Crohn's disease of both small and large intestine with fistula, K50.814 — Crohn's disease of both small and large intestine with abscess, K50.818 — Crohn's disease of both small and large intestine with other complication, K50.819 — Crohn's disease of both small and large intestine with unspecified complications, K50.90 — Crohn's disease, unspecified, without complications, 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, +7 more

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Crohn's Disease (Regional Enteritis)) for risk-adjusted payment.

K50.10 — Crohn's disease of large intestine without complications, K50.111 — Crohn's disease of large intestine with rectal bleeding, K50.112 — Crohn's disease of large intestine with intestinal obstruction, K50.113 — Crohn's disease of large intestine with fistula, K50.114 — Crohn's disease of large intestine with abscess, K50.118 — Crohn's disease of large intestine with other complication, K50.119 — Crohn's disease of large intestine with unspecified complications, K50.80 — Crohn's disease of both small and large intestine without complications, K50.811 — Crohn's disease of both small and large intestine with rectal bleeding, K50.812 — Crohn's disease of both small and large intestine with intestinal obstruction, K50.813 — Crohn's disease of both small and large intestine with fistula, K50.814 — Crohn's disease of both small and large intestine with abscess, K50.818 — Crohn's disease of both small and large intestine with other complication, K50.819 — Crohn's disease of both small and large intestine with unspecified complications, K50.90 — Crohn's disease, unspecified, without complications, 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, +7 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Intestine Transplant Status/Complications, Ulcerative Colitis

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Regional enteritis and ulcerative colitis, Gastrointestinal hemorrhage).

K50.118 — Crohn's disease of large intestine with other complication, K50.119 — Crohn's disease of large intestine with unspecified complications, K50.80 — Crohn's disease of both small and large intestine without complications, K50.811 — Crohn's disease of both small and large intestine with rectal bleeding, K50.812 — Crohn's disease of both small and large intestine with intestinal obstruction, K50.813 — Crohn's disease of both small and large intestine with fistula, K50.814 — Crohn's disease of both small and large intestine with abscess, K50.818 — Crohn's disease of both small and large intestine with other complication, K50.819 — Crohn's disease of both small and large intestine with unspecified complications, K50.90 — Crohn's disease, unspecified, without complications, 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, K51.00 — Ulcerative (chronic) pancolitis without 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, +107 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Enteritis”; these codes share that main term but sit in a different category of the Tabular List.

A08.2 — Adenoviral enteritis (adenovirus), A08.31 — Calicivirus enteritis (calicivirus), A08.32 — Astrovirus enteritis (astrovirus), A08.39 — Other viral enteritis (torovirus), A08.4 — Viral intestinal infection, unspecified (viral), A08.8 — Other specified intestinal infections (infectious NOS, specified organism NEC), A09 — Infectious gastroenteritis and colitis, unspecified (septic), A18.32 — Tuberculous enteritis (tuberculous), B37.82 — Candidal enteritis (candidal), B82.9 — Intestinal parasitism, unspecified (parasitic NEC), K52.0 — Gastroenteritis and colitis due to radiation (radiation), K52.1 — Toxic gastroenteritis and colitis (toxic NEC), K52.21 — Food protein-induced enterocolitis syndrome (allergic, with, FPIES), K52.22 — Food protein-induced enteropathy (allergic, with, food protein-induced enteropathy), K52.29 — Other allergic and dietetic gastroenteritis and colitis (dietetic), K52.81 — Eosinophilic gastritis or gastroenteritis (eosinophilic), K52.9 — Noninfective gastroenteritis and colitis, unspecified, K55.019 — Acute (reversible) ischemia of small intestine, extent unspecified (fulminant), K55.1 — Chronic vascular disorders of intestine (ischemic, chronic), K55.9 — Vascular disorder of intestine, unspecified (ischemic), +28 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Fecal Occult Blood Test (FOBT), Gamma-glutamyl Transferase (GGT) Test, Iron Panel, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of K50.911 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run K50.911 with these 8 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • E55.0 — Rickets, active[Excludes1](via K50.-): “Crohn's rickets (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • K51 — Ulcerative colitis[Excludes1](via K50.-): “Crohn's disease [regional enteritis] (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

Referenced by Code First instructions

  • K60.3 — Anal fistula[Code First](via K50.-): “Crohn's disease (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • K60.4 — Rectal fistula[Code First](via K50.-): “Crohn's disease (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • K60.5 — Anorectal fistula[Code First](via K50.-): “Crohn's disease (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

  • M07 — Enteropathic arthropathies[Code Also](via K50.-): “regional enteritis [Crohn's disease] (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • M08 — Juvenile arthritis[Code Also](via K50.-): “regional enteritis [Crohn's disease] (K50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 80 — Crohn's Disease (Regional Enteritis) [CMS-HCC]: “Crohn's Disease (Regional Enteritis) — supersedes HCC 81 (Ulcerative Colitis)”— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 06 — Diseases and Disorders of the Digestive System[MDC crossing]: “Diseases and Disorders of the Digestive System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 5,748 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective), regional (of), with, complication, rectal bleeding[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (36)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "K50.911 — Crohn's disease, unspecified, with rectal bleeding." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/k50.911-crohns-disease-unspecified-with-rectal-bleeding

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Crohn's disease, unspecified, with rectal bleeding

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to K50.911 in its code family, with their registry titles.

View all codes in the K50 family