2026 ICD-10-CM Diagnosis Code E89.1Postprocedural hypoinsulinemia
ICD-10-CM Codes›E00–E89›E89›E89
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
E89.1 is a billable ICD-10-CM diagnosis code for postprocedural hypoinsulinemia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 8, 10, 19, 640 through 641. 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 355 closely related codes. Coders also document this condition as hypoinsulinemia following procedure. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diabetes mellitus without complication and Postprocedural or postoperative endocrine or metabolic complication.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hypoinsulinemia following procedure
- Hypoinsulinism
- Postpancreatectomy hyperglycemia
- Postpancreatectomy hypoinsulinemia
- Post-surgical hypoinsulinemia
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Postpancreatectomy hyperglycemia
- Postsurgical hypoinsulinemia
Code First
- , if applicable, diabetes mellitus postpancreatectomy postprocedural E13
Use Additional Code
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.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional 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.
Postprocedural See Also: Postoperative;
hypoinsulinemia E89.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Metabolic Disorders
Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel.
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Convert E89.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E89.1Overview
What is the ICD-10 code for postprocedural hypoinsulinemia?
The ICD-10-CM code for postprocedural hypoinsulinemia is E89.1 (sometimes written as E891). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is E89.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural hypoinsulinemia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does E89.1 group to?
When postprocedural hypoinsulinemia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 8, 10, 19, 640, 641, with relative weights from 0.7782 to 6.6272 depending on complications. Higher weights mean higher Medicare reimbursement.
Is E89.1 a CC or MCC?
CMS lists E89.1 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 355 closely related codes in its exclusion list.
What is the ICD-9 equivalent of E89.1?
Under the General Equivalence Mappings, postprocedural hypoinsulinemia converts to ICD-9-CM 251.3 (postsurg hypoinsulinemia). The mapping is a direct match.
