What is ICD-10 code K50.918?

K50.918 is the ICD-10-CM diagnosis code for Crohn's disease, unspecified, with other complication. Crohn's disease of unspecified location with complications other than rectal bleeding, obstruction, fistula, or abscess. It belongs to the ICD-10-CM chapter for diseases of the digestive system (k00-k95). K50.918 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. K50.918 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. K50.918 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. K50.918 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for K50.918?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For K50.918, V28 maps to Crohn's Disease (Regional Enteritis) at RAF 0.550 while V24 mapped to Inflammatory Bowel Disease at RAF 0.308. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting K50.918?

Clearly document the specific complication in the medical record (such as perforation, toxic megacolon, or arthritis) Ensure the complication is directly related to the Crohn's disease process Because K50.918 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

2026 ICD-10-CM K50.918: Crohn's disease

ICD-10-CM Code View

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Code lookupK50.918Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the digestive system (K00-K95) / Noninfective enteritis and colitis (K50-K52)

K50.918

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Crohn's disease, unspecified, with other complication

Crohn's disease of unspecified location with complications other than rectal bleeding, obstruction, fistula, or abscess.

Buddy Insight

Crohn's disease, unspecified, with other complication captures Crohn's disease at an unspecified location with a documented complication that is not bleeding, obstruction, fistula, or abscess.

CMS-HCC V28

Mapped

HCC 80

Crohn's Disease (Regional Ent...

RAF 0.550

CMS-HCC V24

Mapped

HCC 35

Inflammatory Bowel Disease

RAF 0.308

ACA/HHS

Mapped

HCC 48

HHS-HCC 48

Varies by metal level

ESRD/PACE

Mapped

HCC 35

Inflammatory Bowel Disease

RAF 0.048

RXHCC

Mapped

HCC 67

Inflammatory Bowel Disease

RAF 0.494

Code Book Path

Official

K50.9Crohn's disease, unspecified

K50.91Crohn's disease, unspecified, with complications

K50.918Crohn's disease, unspecified, with other complication

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for K50.918 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for K50.918 in this effective period.

Related Child Codes

Official

K50.911Crohn's disease, unspecified, with rectal bleeding

K50.912Crohn's disease, unspecified, with intestinal obstruction

K50.913Crohn's disease, unspecified, with fistula

K50.914Crohn's disease, unspecified, with abscess

K50.919Crohn's disease, unspecified, with unspecified complications

Includes

Official

ICD-10-CM does not list Includes notes for K50.918 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for K50.918 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for K50.918 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for K50.918 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for K50.918 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of Crohn's disease with a specific complication identified

Clear identification of the complication type that does not fit the standard categories

Documentation that the disease site could not be determined

Clinical evidence supporting the complication's relationship to Crohn's disease

MEAT Support

HCC Buddy guidance

Provider documentation of Crohn's disease with a specific complication identified

Clear identification of the complication type that does not fit the standard categories

Documentation that the disease site could not be determined

Clinical evidence supporting the complication's relationship to Crohn's disease

Audit Caution

HCC Buddy guidance

Using K50.918 when a more specific complication code is available

Not documenting the specific complication to support the 'other' designation

Failing to query for both site and complication specificity

Confusing 'other' (identified but non-standard) with 'unspecified' (unknown) complications

Common Mistakes

HCC Buddy guidance

K50.919 — Crohn's disease, unspecified, with unspecified complications: complication type unknown

K50.911-K50.914 — Specific complication codes for unspecified site: use when complication is standard

K50.90 — Crohn's disease, unspecified, without complications: no complications present

K50.818 — Crohn's disease of both sites with other complication: both sites specified

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is K50.918 an HCC code?

Yes. K50.918 (Crohn's disease, unspecified, with other complication) maps to Crohn's Disease (Regional Enteritis) under the CMS-HCC V28 risk adjustment model (and Inflammatory Bowel Disease under V24), with a community non-dual aged RAF of 0.550. It is billable for payment year 2026.

Coder answer: K50.918 is billable and maps to V28 HCC 80, Crohn's Disease (Regional Enteritis). Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: K50.918
Description: Crohn's disease, unspecified, with other complication
HCC (V28): HCC 80 — Crohn's Disease (Regional Enteritis)
RAF: 0.550
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 80, Crohn's Disease (Regional Enteritis)

0.550

V24HCC 35, Inflammatory Bowel Disease

0.308

ESRDHCC 35, Inflammatory Bowel Disease

0.048

RxHCCHCC 67, Inflammatory Bowel Disease

0.494

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work K50.918 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for K50.918

For K50.918 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed K50.918 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

K50.918 is the ICD-10-CM diagnosis code for crohn's disease, unspecified, with other complication. Crohn's disease of unspecified location with complications other than rectal bleeding, obstruction, fistula, or abscess. K50.918 sits in the ICD-10-CM chapter for diseases of the digestive system (k00-k95), within the section covering noninfective enteritis and colitis (k50-k52).

Under the CMS-HCC V28 risk adjustment model, K50.918 maps to Crohn's Disease (Regional Enteritis) (HCC 80) with a community, non-dual, aged base RAF weight of 0.550. Under the older CMS-HCC V24 model, K50.918 maps to Inflammatory Bowel Disease (HCC 35) with a community, non-dual, aged base RAF weight of 0.308. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Clearly document the specific complication in the medical record (such as perforation, toxic megacolon, or arthritis). Because K50.918 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for K50.918 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Clearly document the specific complication in the medical record (such as perforation, toxic megacolon, or arthritis)
•Ensure the complication is directly related to the Crohn's disease process

Clinical Significance

Crohn's disease, unspecified, with other complication captures Crohn's disease at an unspecified location with a documented complication that is not bleeding, obstruction, fistula, or abscess. This may include perforation, toxic megacolon, pyoderma gangrenosum, or other extraintestinal manifestations. The combination of unspecified site with an atypical complication makes this a low-specificity code that should prompt documentation improvement.

Documentation Requirements

✓Provider documentation of Crohn's disease with a specific complication identified
✓Clear identification of the complication type that does not fit the standard categories
✓Documentation that the disease site could not be determined
✓Clinical evidence supporting the complication's relationship to Crohn's disease
✓Treatment plan for the specific complication

Commonly Confused Codes

•K50.919: Crohn's disease, unspecified, with unspecified complications: complication type unknown
•K50.911-K50.914: Specific complication codes for unspecified site: use when complication is standard
•K50.90: Crohn's disease, unspecified, without complications: no complications present
•K50.818: Crohn's disease of both sites with other complication: both sites specified