K50.90 - Crohn's disease, unspecified, without complications

Clinical Definition

A diagnosis code for mucocutaneous lymph node syndrome (MCLS), also known as Kawasaki disease. This is an acute febrile illness primarily affecting children under 5 years old, characterized by inflammation of blood vessels throughout the body.

Documentation Requirements

• Duration of fever (must be ≥5 days)

• At least 4 of the 5 principal clinical findings:

  • Bilateral conjunctival injection

  • Oral mucosal changes (cracked lips, strawberry tongue)

  • Peripheral extremity changes (redness, swelling, peeling)

  • Polymorphous rash

  • Cervical lymphadenopathy (>1.5 cm diameter)

• Cardiac involvement status (if present)

• Phase of illness (acute, subacute, or convalescent)

• Treatment response

• Laboratory findings (if available)

  • CRP/ESR levels

  • Platelet count

  • Coronary artery status

Common Synonyms

• Kawasaki disease

• MCLS

• Mucocutaneous lymph node syndrome

• Kawasaki syndrome

• Infantile polyarteritis

Coding Conflicts

Excludes1:

• Juvenile rheumatoid arthritis

• Stevens-Johnson syndrome

• Scarlet fever

• Toxic shock syndrome

Scribing.io Automation

The AI scribe automatically identifies:

• Keywords related to diagnostic criteria ("fever," "conjunctival injection," "rash")

• Temporal markers for fever duration

• Laboratory values indicating inflammation

• Cardiac examination findings

• Treatment documentation including IVIG administration

• Follow-up plans for cardiac monitoring
  The system flags incomplete documentation when key diagnostic criteria are missing and prompts for additional specificity.