Alphabetic Index FY2027

E89.1

Postprocedural hypoinsulinemia

FY2027Chapter 4: Endocrine, nutritional and metabolic diseases/E89 Postprocedural endocrine and metabolic complications and disorders, not elsewhere classified

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - OtherHospital CC

E89.1 (also written E891) is a billable ICD-10-CM diagnosis code for postprocedural hypoinsulinemia. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 17 codes in category E89 (Postprocedural endocrine and metabolic complications and disorders, not elsewhere classified). The Alphabetic Index lists it under 7 entries. Its coding notes include a Code first instruction, a Use additional code instruction, 3 Excludes1 entries and 1 Excludes2 entry.

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Intraoperative and postprocedural complications are coded from the body system chapters unless the complication is specifically indexed to a T code.

Guidelines I.C.19.g.5Postprocedural complications in the body system chaptersRead the official text

Postpancreatectomy diabetes takes E89.1, with an E13 code first-listed and Z90.41 as an additional code.

Guidelines I.C.4.a.6.b.iDiabetes after pancreatectomyRead the official text

Code first

If the underlying condition listed here is present and known, sequence it first.

This code
  • , if applicable, diabetes mellitus (postpancreatectomy) (postprocedural) (E13.-)

Use additional code

Add the listed code as a secondary code, if known.

This code
  • code, if applicable, to identify:

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • transient postprocedural hyperglycemia (R73.9)
  • transient postprocedural hypoglycemia (E16.2)
Also from chapter/block level (1 note)
Inherited from Chapter 4 Endocrine, nutritional and metabolic diseases
  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from E89 Postprocedural endocrine and metabolic complications and disorders, not elsewhere classified
  • intraoperative complications of endocrine system organ or structure (E36.0-, E36.1-, E36.8)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Hospital CC

Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 355 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.

Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix C

Inclusion terms

Conditions classified to this code.

This code
  • Postpancreatectomy hyperglycemia
  • Postsurgical hypoinsulinemia

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 4 Endocrine, nutritional and metabolic diseases
  • All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 7 entries