E16.A ICD-10-CM Code: Hypoglycemia level

Coder workflow for E16.A

MedCoder structured workflow — derived from this code’s own official record

Before you code E16.A

1. E16.A is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewE16.A1, E16.A2, E16.A3

   See the relationships section · Guide: How to choose an ICD-10-CM code →

Choose the right path

1. Does the documentation support one of the more specific codes beneath E16.A?
   Yes → Select that code and continue the checks below on its own page.
   No → E16.A cannot be reported as written; query for the specificity its subcategory needs.

   ReviewE16.A1, E16.A2, E16.A3

Consider E16.A. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse E16.A with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of E16.A — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• E16.2— Specificity relationship (Review)

  Overlapping diagnoses in the same category.

  Overlapping codes in the same category — the documentation decides which is the more specific fit.

  What moves you there: A record that documents no more than “Hypoglycemia, unspecified” takes E16.2; specificity in the record moves it back here.

  Full comparison: E16.A vs E16.2 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• Not billable as written — a more specific code is required: E16.A1, E16.A2, E16.A3.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name E16.A or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Code First instruction: G63 — Polyneuropathy in diseases classified elsewhere (via E16.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 9 Use Additional Code instructions: E08.64 — Diabetes mellitus due to underlying condition with hypoglycemia, E09.64 — Drug or chemical induced diabetes mellitus with hypoglycemia, E10.64 — Type 1 diabetes mellitus with hypoglycemia, E11.64 — Type 2 diabetes mellitus with hypoglycemia, E13.64 — Other specified diabetes mellitus with hypoglycemia, E16.0 — Drug-induced hypoglycemia without coma, E16.1 — Other hypoglycemia, E16.2 — Hypoglycemia, unspecified, E89.83 — Postprocedural hypoglycemia following a procedure.

These codes instruct coders to additionally report this code when it applies.

Contextual Map

Every relationship of E16.A in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run E16.A with these 9 related codes in Claim Check

Hierarchy

• E00-E89 — Chapter 4: Endocrine, Nutritional and Metabolic Diseases (E00-E89) (E00-E89)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E15-E16 — Other disorders of glucose regulation and pancreatic internal secretion[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Code First instructions

• G63 — Polyneuropathy in diseases classified elsewhere[Code First](via E16.-): “endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions (9)

• E08.64 — Diabetes mellitus due to underlying condition with hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E09.64 — Drug or chemical induced diabetes mellitus with hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E10.64 — Type 1 diabetes mellitus with hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E11.64 — Type 2 diabetes mellitus with hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E13.64 — Other specified diabetes mellitus with hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E16.0 — Drug-induced hypoglycemia without coma[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E16.1 — Other hypoglycemia[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• E16.2 — Hypoglycemia, unspecified[Use Additional Code]: “code for hypoglycemia level, if applicable (E16.A-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 1 more

Nearest codes (11)

• E16 — Other disorders of pancreatic internal secretion[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.0 — Drug-induced hypoglycemia without coma[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.1 — Other hypoglycemia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.2 — Hypoglycemia, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.3 — Increased secretion of glucagon[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.4 — Increased secretion of gastrin[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.8 — Other specified disorders of pancreatic internal secretion[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• E16.9 — Disorder of pancreatic internal secretion, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 3 more

Change history

• FY2025 — Added to the code set[Change history]— CMS release files (code change ledger) · icd10cm-fy2025

Relevant guides

• How Do I Code Diabetes With Hyperglycemia or Hypoglycemia? E11.65, E11.64-, and the E16.A Level →

Common coding questions

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to E16.A in its code family, with their registry titles.

• E16.0 — Drug-induced hypoglycemia without coma
• E16.1 — Other hypoglycemia
• E16.2 — Hypoglycemia, unspecified
• E16.3 — Increased secretion of glucagon
• E16.4 — Increased secretion of gastrin
• E16.8 — Other specified disorders of pancreatic internal secretion
• E16.9 — Disorder of pancreatic internal secretion, unspecified
• E16.A1 — Hypoglycemia level 1
• E16.A2 — Hypoglycemia level 2
• E16.A3 — Hypoglycemia level 3

View all codes in the E16 family