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

Complete ICD-10-CM coding and documentation guide for Resistant Hypertension. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

Apparent Treatment Resistant HypertensionTrue Resistant Hypertension

Related ICD-10 Code Ranges

Complete code families applicable to Resistant Hypertension

I10-I16Primary Range

Hypertensive diseases

This range includes codes for various types of hypertension, including resistant hypertension.

Key Information: ICD-10 code for resistant hypertension

Essential facts and insights about Resistant Hypertension

The ICD-10 code for resistant hypertension is I1A.0, used when hypertension is uncontrolled despite three antihypertensive medications.

Primary ICD-10-CM Code for resistant hypertension

Resistant hypertension
Billable Code

Decision Criteria

clinical Criteria

  • BP remains uncontrolled on three medications including a diuretic

documentation Criteria

  • Documentation must specify medication names, doses, and BP readings

Applicable To

  • Apparent treatment resistant hypertension
  • True resistant hypertension

Excludes

  • Secondary hypertension (I15.-)

Clinical Validation Requirements

  • BP remains ≥130/80 mmHg on three antihypertensive medications, including a diuretic
  • Exclusion of pseudoresistance through ambulatory BP monitoring
  • Medication adherence confirmed

Code-Specific Risks

  • Incorrect sequencing with underlying hypertension codes
  • Lack of documentation on medication adherence

Coding Notes

  • Ensure documentation specifies the use of three antihypertensive medications including a diuretic and confirms uncontrolled BP.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Hypertensive crisis

I16.-
Use if there is an urgent or emergent BP elevation in addition to resistant hypertension.

Long-term use of other medications

Z79.899
Use to track long-term use of antihypertensive medications.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Secondary hypertension

I15.-
Use I15.- if hypertension is due to a secondary cause, such as renovascular disease.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting Resistant Hypertension to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code I1A.0.

Impact

Clinical: May lead to misdiagnosis of resistant hypertension., Regulatory: Non-compliance with documentation standards., Financial: Potential claim denials due to insufficient documentation.

Mitigation Strategy

Include adherence checks in documentation, Use electronic pill counts or urine tests

Impact

Reimbursement: Incorrect sequencing can lead to denied claims., Compliance: Non-compliance with ICD-10 coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation Strategy

Always code the underlying hypertension first, followed by I1A.0.

Impact

Lack of adherence documentation may lead to audit findings.

Mitigation Strategy

Implement routine adherence checks and document findings.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for Resistant Hypertension, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for Resistant Hypertension

Use these documentation templates to ensure complete and accurate documentation for Resistant Hypertension. These templates include all required elements for proper coding and billing.

Patient with uncontrolled BP on three medications

Specialty: Cardiology

Required Elements

  • Medication names and doses
  • BP readings
  • Confirmation of medication adherence

Example Documentation

Patient is on lisinopril 40mg, amlodipine 10mg, chlorthalidone 25mg with BP 148/92 mmHg.

Examples: Poor vs. Good Documentation

Poor Documentation Example
Hypertension uncontrolled.
Good Documentation Example
BP 150/94 mmHg despite maximal-dose lisinopril 40mg, amlodipine 10mg, and chlorthalidone 25mg; confirmed by 24-hour ABPM.
Explanation
The good example provides specific medication details and BP measurements, confirming resistant hypertension.

Need help with ICD-10 coding for Resistant Hypertension? Ask your questions below.

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