FY2027 ICD-10-CM reference
E89.1: Postprocedural hypoinsulinemia
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Postprocedural hypoinsulinemia. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
CMS-HCC V28
No V28 HCC for 2026 dates of service (CMS 2027 Initial ICD-10-CM Mappings)
CMS-HCC V24
Not used for payment year 2027 Medicare Advantage payment
ESRD
No category in the PY2026 CMS mapping; CMS 2027 initial file unchanged
PACE
Source verification pending
RxHCC
No category in the PY2026 CMS mapping; CMS 2027 initial file unchanged
HHS-HCC
No category in the HHS-HCC 2026 benefit year mapping
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
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.
Source: E00-E89 (chapter, inherited).
Excludes1
transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Source: E00-E89 (chapter, inherited).
Excludes2
intraoperative complications of endocrine system organ or structure (E36.0-, E36.1-, E36.8)
Source: E89 (category, inherited).
Instructional note
Postpancreatectomy hyperglycemia
Source: E89.1 (self, direct).
Instructional note
Postsurgical hypoinsulinemia
Source: E89.1 (self, direct).
Code first
, if applicable, diabetes mellitus (postpancreatectomy) (postprocedural) (E13.-)
Source: E89.1 (self, direct).
Instructional note
code, if applicable, to identify:
Source: E89.1 (self, direct).
Instructional note
acquired absence of pancreas (Z90.41-)
Source: E89.1 (self, direct).
Instructional note
insulin use (Z79.4)
Source: E89.1 (self, direct).
Excludes1
transient postprocedural hyperglycemia (R73.9)
Source: E89.1 (self, direct).
Excludes1
transient postprocedural hypoglycemia (E16.2)
Source: E89.1 (self, direct).
Compare the FY2027 additions, removals and billable-status changes
What does E89.1 mean in FY2027?
The official ICD-10-CM descriptor is Postprocedural hypoinsulinemia. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is E89.1 billable in FY2027?
The FY2027 order file marks E89.1 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does E89.1 map to an HCC?
E89.1 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: no ESRD category; no RxHCC category. Coefficients for these models are pending verification for payment year 2027. HHS-HCC: no category in the HHS-HCC 2026 benefit year mapping. CMS-HCC V24: not used for payment year 2027 Medicare Advantage payment (CMS CY 2027 Rate Announcement). The PACE mapping is still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition