K90.0

Celiac disease

Celiac disease, also known as gluten-sensitive enteropathy, is a chronic, immune-mediated systemic disorder triggered by the ingestion of dietary gluten in genetically predisposed individuals. Gluten, a storage protein found in wheat, barley, and rye, initiates an inflammatory T-cell-mediated response in the small intestine. This results in progressive mucosal injury characterized by villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes. This architectural damage significantly reduces the surface area for nutrient absorption, leading to malabsorption of fats, proteins, carbohydrates, vitamins, and minerals. The condition is strongly associated with the Human Leukocyte Antigen (HLA) DQ2 and DQ8 alleles. Beyond the gastrointestinal tract, celiac disease is considered a multisystemic autoimmune disorder that can affect nearly every organ system, often presenting with extraintestinal manifestations even in the absence of significant digestive symptoms.

Clinical Symptoms

  • Chronic or recurrent diarrhea
  • Steatorrhea (pale, foul-smelling, fatty stools)
  • Abdominal pain and cramping
  • Abdominal distension and bloating
  • Unexplained weight loss
  • Iron-deficiency anemia (often refractory to oral supplementation)
  • Dermatitis herpetiformis (itchy, blistering skin rash)
  • Fatigue and malaise
  • Osteoporosis or osteopenia
  • Dental enamel defects
  • Aphthous stomatitis (canker sores)
  • Peripheral neuropathy (numbness or tingling in hands and feet)
  • Ataxia (balance and coordination issues)
  • Elevated liver enzymes (unexplained transaminitis)
  • Delayed puberty or growth failure (in pediatric patients)

Common Causes

  • Dietary ingestion of gluten (gliadin and glutenin proteins)
  • Genetic predisposition (presence of HLA-DQ2 or HLA-DQ8 haplotypes)
  • Loss of oral tolerance to gluten leading to autoimmune response
  • Environmental triggers (e.g., specific viral infections in early childhood)
  • Altered intestinal permeability ('leaky gut')
  • Early introduction of gluten into the infant diet (potential risk factor)
  • History of other autoimmune conditions (e.g., Type 1 diabetes, autoimmune thyroiditis)
  • Presence of certain genetic syndromes, such as Down syndrome or Turner syndrome

Documentation & Coding Tips

Distinguish between Celiac Disease and Non-Celiac Gluten Sensitivity.

Example: Patient presents for follow-up of chronic diarrhea and bloating. Serology positive for tTG IgA and EMA. Duodenal biopsy reveals villous atrophy and crypt hyperplasia, Marsh 3c. Diagnosis confirmed as Celiac disease (K90.0). Condition is chronic and requires lifelong gluten-free diet to prevent malabsorption-related complications.

Billing Focus: Documentation must specify clinical evidence such as serology results or biopsy findings to differentiate K90.0 from K90.41 (Non-celiac gluten sensitivity).

Explicitly document the presence of Dermatitis Herpetiformis when present.

Example: Patient with known K90.0 presents with intensely pruritic, vesicular skin lesions on bilateral elbows and knees. Skin biopsy confirmed Dermatitis herpetiformis (L13.0). Management includes dapsone 50mg daily and strict gluten-free diet for both intestinal and cutaneous manifestations.

Billing Focus: Document the cutaneous manifestation separately as L13.0 to capture the full clinical picture; laterality of skin lesions should be noted.

Identify and document Refractory Celiac Disease (RCD) Type I or II.

Example: Patient with long-standing Celiac disease (K90.0) remains symptomatic despite strict adherence to a gluten-free diet for 14 months. Repeat biopsy shows persistent villous atrophy with abnormal T-cell population. Diagnosed with Refractory Celiac Disease Type II. Initiating systemic corticosteroids.

Billing Focus: Specify 'refractory' status as this justifies higher intensity E/M codes and more frequent follow-up procedures.

Document associated nutritional deficiencies specifically.

Example: 65-year-old female with K90.0 and known secondary osteoporosis (M81.0). Laboratory analysis shows Vitamin D deficiency (E55.9) and Iron deficiency anemia (D50.9) due to proximal small bowel malabsorption. Patient started on high-dose oral Vitamin D3 and parenteral iron.

Billing Focus: Code all nutritional deficiencies separately (D50.9, E55.9, E53.8) to justify labs and supplementation therapy.

Note extra-intestinal autoimmune associations.

Example: Patient with Celiac disease (K90.0) also being managed for Hashimoto's thyroiditis (E06.3) and Type 1 Diabetes Mellitus (E10.9). Recent HbA1c is 7.2%. The presence of multiple autoimmune conditions complicates dietary management and glycemic control.

Billing Focus: Each autoimmune condition must be documented and coded to reflect the complexity of multi-system involvement.

Relevant CPT Codes

Related Diagnoses

Hierarchy