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v1.0.0
ICD-10 Guide
DiagnosesUnspecified Hypertension

Unspecified Hypertension

ICD-10 Coding for Unspecified Hypertension(I10, I15.9)

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

Diagnosis Overview

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

Key Clinical Considerations:

  • Elevated blood pressure readings (systolic ≥ 130 mmHg or diastolic ≥ 80 mmHg)
  • No identifiable secondary cause of hypertension
  • Symptoms may include headaches, dizziness, or nosebleeds

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document patient's blood pressure readings and any symptoms
  • Use specific terminology such as 'essential hypertension' or 'primary hypertension'
  • Examples include: 'Patient presents with elevated BP readings over multiple visits without secondary causes identified.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for differentiating between primary and secondary hypertension.
  • Common errors include misclassifying secondary hypertension as unspecified.

Code Exclusions

Important Exclusions

  • Secondary hypertension due to conditions like renal disease or endocrine disorders
  • Codes for hypertensive heart disease or hypertensive crisis

Related ICD-10 Codes

Primary Codes
I10
Essential (primary) hypertension
Ancillary Codes
I50.9
N18.9
Differential Codes
I15.9
I10

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Primary Care

Specialty Applications

  • Adult patients, particularly those over 40 years old
  • Primary care settings, outpatient 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

Documentation requirements?

Document consistent elevated BP readings and rule out secondary causes.

Billing considerations?

Ensure accurate coding to reflect the diagnosis and any related services provided.