E20-E35
Medium Complexity
Disorders of other endocrine glands
Primary Specialty: Endocrinology
Last Updated: 2025-09-09
ICD-10 Codes (113)
113 billable0 category headers
E21Billable
E21.0Billable
E21.1Billable
E21.2Billable
E21.3Billable
E21.4Billable
E21.5Billable
E22Billable
E22.0Billable
E22.1Billable
E22.2Billable
E22.8Billable
E22.9Billable
E23Billable
E23.0Billable
E23.1Billable
E23.2Billable
E23.3Billable
E23.6Billable
E23.7Billable
E24Billable
E24.0Billable
E24.1Billable
E24.2Billable
E24.3Billable
E24.4Billable
E24.8Billable
E24.9Billable
E25Billable
E25.0Billable
E25.8Billable
E25.9Billable
E26Billable
E26.0Billable
E26.01Billable
E26.02Billable
E26.09Billable
E26.1Billable
E26.8Billable
E26.81Billable
E26.89Billable
E26.9Billable
E27Billable
E27.0Billable
E27.1Billable
E27.2Billable
E27.3Billable
E27.4Billable
E27.40Billable
E27.49Billable
E27.5Billable
E27.8Billable
E27.9Billable
E28Billable
E28.0Billable
E28.1Billable
E28.2Billable
E28.3Billable
E28.31Billable
E28.310Billable
E28.319Billable
E28.39Billable
E28.8Billable
E28.9Billable
E29Billable
E29.0Billable
E29.1Billable
E29.8Billable
E29.9Billable
E30Billable
E30.0Billable
E30.1Billable
E30.8Billable
E30.9Billable
E31Billable
E31.0Billable
E31.1Billable
E31.2Billable
E31.20Billable
E31.21Billable
E31.22Billable
E31.23Billable
E31.8Billable
E31.9Billable
E32Billable
E32.0Billable
E32.1Billable
E32.8Billable
E32.9Billable
E34Billable
E34.0Billable
E34.00Billable
E34.01Billable
E34.09Billable
E34.1Billable
E34.2Billable
E34.3Billable
E34.30Billable
E34.31Billable
E34.32Billable
E34.321Billable
E34.322Billable
E34.328Billable
E34.329Billable
E34.39Billable
E34.4Billable
E34.5Billable
E34.50Billable
E34.51Billable
E34.52Billable
E34.8Billable
E34.9Billable
E35Billable
Updates & Changes
FY 2026 Updates
Current Year
Deleted Codes
No codes deleted in this range for FY 2026
No significant changes for FY 2026
This range maintains stability with current coding practices
Historical Changes
- •FY 2025: Routine maintenance updates with minor terminology clarifications
- •FY 2024: Enhanced specificity requirements for certain code ranges
- •FY 2023: Updated documentation guidelines for improved clarity
Upcoming Changes
- •Proposed updates pending review by Coordination and Maintenance Committee
- •Under consideration: Enhanced digital health integration codes
Implementation Guidance
- •Review all FY 2026 updates for E20-E35 codes before implementation
- •Always verify the most current codes in the ICD-10-CM manual
- •Ensure clinical documentation supports the selected diagnosis codes
- +3 more guidance items...
Range Overview
high priority
The ICD-10 code range E20-E35 pertains to disorders of other endocrine glands. This includes conditions such as hypoparathyroidism, hyperparathyroidism, other disorders of parathyroid gland, multiple endocrine neoplasia [MEN] syndromes, and other specified disorders of endocrine glands. These codes are used to document various endocrine disorders, excluding diabetes mellitus, thyroid disorders, and pituitary gland disorders.
Key Usage Points:
- •These codes are used for endocrine disorders other than diabetes, thyroid, and pituitary gland disorders.
- •E20-E35 codes include conditions related to parathyroid, adrenal, and other endocrine glands.
- •The codes can be used to document both congenital and acquired conditions.
- •Specificity is crucial when coding within this range, including the type of disorder and the affected gland.
- •The codes in this range can be used in any healthcare setting, from outpatient clinics to inpatient hospital settings.
Coding Guidelines
When to Use:
- ✓When a patient is diagnosed with a disorder of the parathyroid gland, such as hyperparathyroidism.
- ✓When a patient has a disorder of the adrenal gland, such as Addison's disease.
- ✓When a patient is diagnosed with a multiple endocrine neoplasia syndrome.
- ✓When a patient has a disorder of the endocrine gland, not otherwise specified.
When NOT to Use:
- ✗When a patient has a disorder of the thyroid gland; use codes in the E00-E07 range instead.
- ✗When a patient has diabetes mellitus; use codes in the E08-E13 range instead.
- ✗When a patient has a disorder of the pituitary gland; use codes in the E22-E23 range instead.
- ✗When a patient has a disorder of the pancreas; use codes in the E15-E16 range instead.
Code Exclusions
Always verify exclusions with the latest ICD-10-CM official guidelines and the patient's medical record.
Documentation Requirements
Proper documentation for E20-E35 codes should clearly specify the type of endocrine disorder, the affected gland, and any related complications or manifestations. The documentation should be supported by clinical findings, diagnostic tests, and treatment plans.
Clinical Information:
- •Specific type of endocrine disorder
- •Affected gland
- •Presence of any complications or manifestations
- •Results of any relevant diagnostic tests
- •Treatment plan
Supporting Evidence:
- •Medical history
- •Physical examination findings
- •Laboratory test results
- •Imaging studies
Good Documentation Example:
Patient diagnosed with primary hyperparathyroidism. Laboratory tests show elevated parathyroid hormone levels. Plan for surgical removal of parathyroid gland.
Poor Documentation Example:
Patient has endocrine disorder.
Common Documentation Errors:
- âš Not specifying the type of endocrine disorder
- âš Not identifying the affected gland
- âš Not documenting any associated complications or manifestations
- âš Not providing supporting evidence from clinical findings or diagnostic tests
Range Statistics
15
Total Codes
113
Billable
Complexity:
Medium
Primary Use:Clinical Documentation
Chapter:4
Coding Complexity
Medium
Complexity Rating
The E20-E35 code range has a medium complexity rating due to the need for specificity in identifying the type of endocrine disorder and the affected gland. Additionally, the presence of any complications or manifestations can add to the complexity. Coders must also be aware of exclusions and code sequencing rules.
Key Factors:
- â–¸Specificity of the endocrine disorder
- â–¸Identification of the affected gland
- â–¸Presence of any complications or manifestations
- â–¸Need for supporting clinical evidence
- â–¸Exclusions and code sequencing rules
Specialty Focus
The E20-E35 code range is primarily used by endocrinologists, but may also be used by primary care physicians, pediatricians, and surgeons. These codes are used to document a variety of endocrine disorders, excluding diabetes, thyroid, and pituitary gland disorders.
Primary Specialties:
Endocrinology
70%
Primary Care
20%
Pediatrics
5%
Surgery
5%
Clinical Scenarios:
- • A patient with primary hyperparathyroidism undergoing parathyroidectomy
- • A child diagnosed with congenital adrenal hyperplasia
- • A patient with Addison's disease receiving hormone replacement therapy
- • A patient diagnosed with multiple endocrine neoplasia syndrome undergoing genetic testing
Resources & References
There are several resources available for coding endocrine disorders, including the official ICD-10-CM guidelines, clinical reference books, and educational materials from professional coding organizations.
Official Guidelines:
- ICD-10-CM Official Guidelines for Coding and Reporting
- World Health Organization's ICD-10 Classification of Diseases
- National Center for Health Statistics' ICD-10-CM Index and Tabular List
Clinical References:
- Endocrine Society's Clinical Practice Guidelines
- American Association of Clinical Endocrinologists' Clinical Practice Guidelines
Educational Materials:
- American Academy of Professional Coders' ICD-10-CM Training
- American Health Information Management Association's ICD-10-CM Coding Resources
Frequently Asked Questions
Can E20-E35 codes be used for diabetes or thyroid disorders?
No, diabetes and thyroid disorders have their own specific code ranges (E08-E13 for diabetes and E00-E07 for thyroid disorders).
What documentation is needed to code within the E20-E35 range?
Documentation should specify the type of endocrine disorder, the affected gland, and any related complications or manifestations. It should be supported by clinical findings, diagnostic tests, and treatment plans.