K90.49 Malabsorption due to intolerance, not elsewhere classified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Malabsorption due to intolerance to carbohydrate
• Malabsorption due to intolerance to fat
• Malabsorption due to intolerance to protein
• Malabsorption due to intolerance to starch

Applies from K90 Intestinal malabsorption

Excludes1 (never code together)

• intestinal malabsorption following gastrointestinal surgery (K91.2)

Applies from K90.4 Other malabsorption due to intolerance

Excludes2 (not included here)

• celiac gluten-sensitive enteropathy (K90.0)
• lactose intolerance (E73.-)

Risk adjustment (HCC)

• RxHCC V08: HCC 66 — Pancreatic Disorders and Intestinal Malabsorption, Except Pancreatitis

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 579.8 Other specified intestinal malabsorption (approximate)

Code annotations containing back-references to K90.49

Back-references to K90

• Type 1 Excludes: K59 Other functional intestinal disorders ("intestinal malabsorption (K90.-)")

Diagnosis Index entries for K90.49

• Absorption › carbohydrate, disturbance
• Absorption › fat, disturbance
• Absorption › protein, disturbance
• Absorption › starch, disturbance
• Decrease (d) › tolerance › fat
• Disturbance (s) › absorption › carbohydrate
• Disturbance (s) › absorption › fat
• Disturbance (s) › absorption › protein
• Disturbance (s) › absorption › starch
• Enteropathy › protein-losing
• Intolerance › carbohydrate
• Intolerance › fat NEC
• Intolerance › food
• Intolerance › milk NEC
• Intolerance › protein
• Intolerance › starch NEC
• Malabsorption › carbohydrate
• Malabsorption › fat
• Malabsorption › protein
• Malabsorption › starch
• Sprue (tropical) › idiopathic

Nearby codes

• K90.1 Tropical sprue
• K90.2 Blind loop syndrome, not elsewhere classified
• K90.3 Pancreatic steatorrhea
• K90.4 Other malabsorption due to intolerance
• K90.41 Non-celiac gluten sensitivity
• K90.49 Malabsorption due to intolerance, not elsewhere classified (this code)
• K90.8 Other intestinal malabsorption
• K90.81 Whipple's disease
• K90.82 Short bowel syndrome
• K90.821 Short bowel syndrome with colon in continuity
• K90.822 Short bowel syndrome without colon in continuity