ICDcodes.org
FY2027

E16.1 — Other hypoglycemia

Billable

Is E16.1 billable?

Yes — E16.1 is billable for FY2027. E16.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. E16.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.

E16.1 at a glance

CodeE16.1
DescriptionOther hypoglycemia
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does E16.1 group to?

E16.1 sits in MDC 10 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 643Endocrine Disorders with MCCmedical
  • 644Endocrine Disorders with CCmedical
  • 645Endocrine Disorders without CC/MCCmedical

How is E16.1 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to E16.1. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Hyperinsulinism (functional)
  • Encephalopathy › posthypoglycemic (acute)
  • Hyperinsulinism › ectopic (functional)
  • Hypoglycemia › functional, nonhyperinsulinemic (spontaneous)
  • Hypoglycemia › infantile (spontaneous)
  • Hypoglycemia › reactive (spontaneous)
  • Encephalopathy › in › hyperinsulinism (acute)
  • Hyperinsulinism › with › encephalopathy (functional)
  • Hyperplasia, hyperplastic › pancreatic islet cells › beta

Excludes1 — never code together

The conditions below can never be reported together with E16.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

Use additional code

Report an additional code alongside E16.1 to fully describe the condition. E16.1 is sequenced first.

  • code for hypoglycemia level, if applicable (E16.A-)

Inclusion terms

Alternative wording in documentation that is classified to E16.1.

  • Functional hyperinsulinism
  • Functional nonhyperinsulinemic hypoglycemia
  • Hyperinsulinism NOS
  • Hyperplasia of pancreatic islet beta cells NOS

Excludes1 — never code together — inherited from Chapter 4

The conditions below can never be reported together with E16.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • transitory endocrine and metabolic disorders specific to newborn (P70-P74)

How long has E16.1 existed?

E16.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with E16.1?

ICD-10-CM declares these codes mutually exclusive with E16.1 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to E16.1?

What other codes are in the E16 family? (7)