ICD-10 Guide

Siadh

ICD-10 Coding for SIADH(E22.2)

PRIMARY SPECIALTYEndocrinology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Siadh?

Essential facts and insights about SIADH

Key Clinical Considerations:

Hyponatremia (serum sodium < 135 mEq/L)
Inappropriate urine concentration (urine osmolality > 100 mOsm/kg)
Absence of edema and normal adrenal and thyroid function

Clinical Information

Clinical Criteria & Documentation Requirements

Patient history including fluid intake and output
Laboratory results for serum sodium and urine osmolality
Assessment of potential underlying causes

Coding Guidelines

Usage Guidelines & Examples

Follow guidelines for hyponatremia coding
Avoid coding errors related to misdiagnosis of SIADH

Code Exclusions

Important Exclusions

Hypovolemic hyponatremia
Psychogenic polydipsia

Specialty Focus

Primary Specialty

Endocrinology

Specialty Applications

Adults and children with endocrine disorders
Inpatient and outpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

Comprehensive clinical documentation
Accurate code selection based on clinical criteria
Proper exclusion considerations
Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

Ensure proper documentation for billing
Verify code specificity requirements
Check for any additional codes needed
Review payer-specific guidelines

Common Issues

Insufficient clinical documentation
Incorrect code selection
Missing supporting diagnoses
Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document serum sodium levels, urine osmolality, and any underlying conditions.

Billing considerations?

Ensure accurate coding of hyponatremia and any related conditions for proper reimbursement.

Siadh

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

Documentation requirements?

Billing considerations?

Siadh

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

Documentation requirements?

Billing considerations?