2026 ICD-10-CM Diagnosis Code K91.2Postsurgical malabsorption, not elsewhere classified
ICD-10-CM Codes›K00–K95›K90-K95›K91
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K91.2 is a billable ICD-10-CM diagnosis code for postsurgical malabsorption, 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, 791, 793. 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 10 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative digestive system complication.
K91.2 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
K91.2 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.
- Acquired short bowel syndrome
- Blind loop syndrome
- Fatty stool
- Malnutrition
- Malnutrition following gastrointestinal surgery
- Post-gastrointestinal tract surgery malnutrition
- Postoperative blind loop syndrome
- Postprocedural intestinal steatorrhea
- Postprocedural steatorrhea
- Post-surgical malabsorption
- Protein losing enteropathy due to and following cardiac procedure
- Protein-losing enteropathy
- Short bowel syndrome
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Postsurgical blind loop syndrome
Type 1 Excludes
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.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
postgastrectomy K91.2
postsurgical K91.2
postsurgical K91.2
Syndrome See Also: Disease;
postsurgical K91.2
postsurgical K91.2
Tachyalimentation K91.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Short Bowel Syndrome
a malabsorption syndrome resulting from extensive operative resection of the small intestine, the absorptive region of the gastrointestinal tract.Child Nutrition Disorders
disorders caused by nutritional imbalance, either overnutrition or undernutrition, occurring in children ages 2 to 12 years.Fetal Nutrition Disorders
disorders caused by nutritional imbalance, either overnutrition or undernutrition, in the fetus in utero.Infant Nutrition Disorders
disorders caused by nutritional imbalance, either overnutrition or undernutrition, occurring in infants ages 1 month to 24 months.Malnutrition
an imbalanced nutritional status resulting from insufficient intake of nutrients to meet normal physiological requirement.Protein-Energy Malnutrition
the lack of sufficient energy or protein to meet the body's metabolic demands, as a result of either an inadequate dietary intake of protein, intake of poor quality dietary protein, increased demands due to disease, or increased nutrient losses.Severe Acute Malnutrition
acute form of malnutrition which usually affects children, characterized by a very low weight for height (below -3z scores of the median world health organization standards), visible severe wasting, or occurrence of nutritional edema. it can be a direct or indirect cause of fatality in children suffering from diarrhea and pneumonia. do not confuse with starvation, a condition in which the body is not getting enough food, usually for extended periods of time.Blind Loop Syndrome
a malabsorption syndrome that is associated with a blind loop in the upper small intestine that is characterized by the lack of peristaltic movement, stasis of intestinal contents, and the overgrowth of bacteria. such bacterial overgrowth interferes with bile salts action, fatty acids processing, microvilli integrity, and the absorption of nutrients such as vitamin b12 and folic acid.Fetus
the unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. in humans, the unborn young from the end of the eighth week after conception until birth, as distinguished from the earlier embryo, mammalian.Short Bowel Syndrome
malabsorption that results from the removal of a large segment of the small intestine or, less frequently, from the complete dysfunction of a large portion of the small intestine. signs and symptoms include diarrhea, steatorrhea, and weight loss.
Patient EducationClinical
After Surgery
After any operation, you'll have some side effects. There is usually some pain with surgery. There may also be swelling and soreness around the area that the surgeon cut. Your surgeon can tell you which side effects to expect.
Read the full article at MedlinePlus
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Convert K91.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K91.2Overview
What is the ICD-10 code for postsurgical malabsorption, not elsewhere classified?
The ICD-10-CM code for postsurgical malabsorption, not elsewhere classified is K91.2 (sometimes written as K912). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K91.2 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report postsurgical malabsorption, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K91.2 group to?
When postsurgical malabsorption, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, 791, 793, with relative weights from 0.7796 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K91.2 a CC or MCC?
CMS lists K91.2 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 10 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K91.2?
Under the General Equivalence Mappings, postsurgical malabsorption, not elsewhere classified converts to ICD-9-CM 579.3 (intest postop nonabsorb). The mapping is a direct match.
Does K91.2 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: K91.2 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).
