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v1.0.0
ICD-10 Guide
DiagnosesResistant Hypertension

Resistant Hypertension

ICD-10 Coding for Resistant Hypertension(I1A.0)

PRIMARY SPECIALTYCardiology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Resistant Hypertension?
Essential facts and insights about Resistant Hypertension

Key Clinical Considerations:

  • Sustained blood pressure readings of 140/90 mmHg or higher despite adherence to a three-drug regimen including a diuretic
  • Presence of secondary causes of hypertension ruled out
  • Symptoms may include headaches, dizziness, or visual changes

Clinical Information

Clinical Criteria & Documentation Requirements

  • Documented blood pressure readings over multiple visits
  • Evidence of medication adherence and response to treatment
  • Detailed patient history including lifestyle factors and comorbidities

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for differentiating between essential and secondary hypertension.
  • Common errors include misclassifying secondary hypertension or failing to document medication adherence.

Code Exclusions

Important Exclusions

  • Hypertension due to pregnancy (O10-O16)
  • Transient hypertension (R03.0)

Related ICD-10 Codes

Primary Codes
I10
Essential (primary) hypertension
I13.0
Hypertensive heart AND chronic kidney disease
I15.0
Secondary hypertension due to endocrine disorders
Ancillary Codes
I16.-
Z79.899
Differential Codes
I15.-
I15
.- if hypertension is due to a secondary cause, such as renovascular disease.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Adults with chronic hypertension
  • Cardiology clinics, primary care settings, and specialty hypertension clinics

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

What are the documentation requirements?

Document consistent high blood pressure readings, treatment regimens, and patient adherence.

What are the billing considerations?

Ensure accurate coding to reflect the complexity of the condition and any associated comorbidities.