2026 ICD-10-CM Diagnosis Code K90.49Malabsorption due to intolerance, not elsewhere classified
ICD-10-CM Codes›K00–K95›K90-K95›K90
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Chronic Condition
K90.49 is a billable ICD-10-CM diagnosis code for malabsorption due to intolerance, not elsewhere classified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 14 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.
K90.49 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 66 for payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
K90.49 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic diarrhea of infants AND/OR young children
- Complement hyperactivation, angiopathic thrombosis, protein losing enteropathy syndrome
- Congenital chronic diarrhea with protein-losing enteropathy
- Decay accelerating factor deficiency
- D-Xylose intolerance
- D-Xylose tolerance - finding
- Exudative enteropathy
- Gastrointestinal tolerance finding
- Impaired intestinal fat absorption
- Impaired intestinal protein absorption
- Intestinal malabsorption
- Intestinal malabsorption of carbohydrate
- Intestinal malabsorption of fat
- Intestinal malabsorption of protein
- Intolerance to cow milk
- Intolerance to food
- Intolerance to infant formula
- Intolerance to milk
- Intolerance to monosodium glutamate
- Malabsorption due to intolerance to carbohydrate
- Malabsorption due to intolerance to fat
- Malabsorption due to intolerance to protein
- Malabsorption due to intolerance to soy protein
- Monosodium glutamate symptom complex
- Protein malabsorption
- Protein-losing enteropathy
- Syndrome of carbohydrate intolerance
- Wheat intolerance
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Malabsorption due to intolerance to carbohydrate
- Malabsorption due to intolerance to fat
- Malabsorption due to intolerance to protein
- Malabsorption due to intolerance to starch
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
carbohydrate, disturbance K90.49
fat, disturbance K90.49
protein, disturbance K90.49
starch, disturbance K90.49
Disturbance (s) See Also: Disease;
carbohydrate K90.49
fat K90.49
protein K90.49
starch K90.49
protein-losing K90.49
carbohydrate K90.49
fat NEC K90.49
food K90.49
milk NEC K90.49
protein K90.49
starch NEC K90.49
carbohydrate K90.49
fat K90.49
protein K90.49
starch K90.49
idiopathic K90.49
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Malabsorption Syndromes
Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K90.49 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replacement K90.49 replaces the following previously assigned code(s):
- K90.4 - Malabsorption due to intolerance, not elsewhere classified
- K90.4 - Other malabsorption due to intolerance
Questions About K90.49Overview
What is the ICD-10 code for malabsorption due to intolerance, not elsewhere classified?
The ICD-10-CM code for malabsorption due to intolerance, not elsewhere classified is K90.49 (sometimes written as K9049). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K90.49 (Other malabsorption due to intolerance) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malabsorption due to intolerance, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K90.49 group to?
When malabsorption due to intolerance, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K90.49 a CC or MCC?
CMS lists K90.49 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 14 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K90.49?
Under the General Equivalence Mappings, malabsorption due to intolerance, not elsewhere classified converts to ICD-9-CM 579.8 (intest malabsorption NEC). The mapping is approximate, so confirm the match fits the documentation.
Does K90.49 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: K90.49 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 66 (Pancreatic Disorders and Intestinal Malabsorption, Except Pancreatitis).
