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I48.91
ICD-10-CM
Thyroid-Related Atrial Fibrillation

Find information on Thyroid-Related Atrial Fibrillation diagnosis, including clinical documentation, medical coding, ICD-10 codes, and healthcare guidelines. Learn about the connection between thyroid disorders, hyperthyroidism, hypothyroidism, and atrial fibrillation. Explore resources for accurate medical coding and documentation best practices for thyroid-related AFib. This resource provides guidance for clinicians and healthcare professionals on properly documenting and coding this complex condition.

Also known as

Thyrotoxic Atrial Fibrillation
Hyperthyroid AFib

Diagnosis Snapshot

Key Facts
  • Definition : Atrial fibrillation triggered or worsened by thyroid hormone excess (hyperthyroidism).
  • Clinical Signs : Rapid, irregular heartbeat, palpitations, shortness of breath, fatigue, and symptoms of hyperthyroidism like weight loss, anxiety.
  • Common Settings : Outpatient cardiology or endocrinology clinics, sometimes emergency departments for acute onset or rate control.

Related ICD-10 Code Ranges

Complete code families applicable to AAPC I48.91 Coding
I48

Atrial fibrillation and flutter

Irregular and often rapid heart rate originating in the atria.

E00-E07

Disorders of thyroid gland

Conditions affecting thyroid hormone production and regulation.

E05

Thyrotoxicosis

Excessive thyroid hormone levels in the body.

Code-Specific Guidance

Decision Tree for

Follow this step-by-step guide to choose the correct ICD-10 code.

Is atrial fibrillation documented?

  • Yes

    Is thyroid dysfunction documented?

  • No

    Do not code atrial fibrillation. Code the underlying thyroid condition if applicable.

Code Comparison

Related Codes Comparison

When to use each related code

Description
Thyroid-related Atrial Fibrillation
Hyperthyroidism-induced Cardiomyopathy
Thyrotoxic Periodic Paralysis

Documentation Best Practices

Documentation Checklist
  • Document thyroid function tests (TSH, T3, T4).
  • Explicitly link atrial fibrillation to thyroid disorder.
  • Specify type of thyroid disease (e.g., hyperthyroidism).
  • Document AF symptoms (e.g., palpitations, fatigue).
  • Record management of both AF and thyroid condition.

Coding and Audit Risks

Common Risks
  • Unspecified AFib Type

    Coding AFib without specifying paroxysmal, persistent, or permanent with thyroid disease may lead to inaccurate DRG assignment and reimbursement.

  • Causality Documentation

    Insufficient documentation linking thyroid disorder and AFib can cause coding and billing errors, impacting compliance and revenue.

  • Thyroid Disorder Specificity

    Lack of specific thyroid diagnosis (e.g., hyperthyroidism vs. hypothyroidism) can affect accurate code assignment and quality reporting.

Mitigation Tips

Best Practices
  • Document thyroid function tests (TSH, T3, T4) for A Fib.
  • ICD-10 I48.x, E05.9, query hyperthyroidism impact on A Fib.
  • CDI: Detail thyroid disorder severity and A Fib correlation.
  • HCC coding: Capture thyroid disease with A Fib for RAF.
  • Review medication list for thyroid meds impacting A Fib management.

Clinical Decision Support

Checklist
  • 1. Confirm AFib diagnosis (ECG/Holter)
  • 2. Check TSH, Free T4, Free T3 levels
  • 3. Evaluate for thyroid symptoms/signs
  • 4. Assess for other AFib risk factors
  • 5. Document thyroid status impact on AFib

Reimbursement and Quality Metrics

Impact Summary
  • Thyroid-Related Atrial Fibrillation Reimbursement and Quality Metrics Impact Summary
  • ICD-10 I48.x, E05.x, I48.91 accurate coding impacts CC/MCC capture, optimizing MS-DRG assignment.
  • Complete documentation of thyroid function tests (TFTs) affects quality reporting measures and value-based payments.
  • Timely diagnosis and treatment influence hospital readmission rates for atrial fibrillation (AFib) patients.
  • Proper coding and documentation of thyroid-related AFib impacts hospital reimbursement and performance metrics.

Streamline Your Medical Coding

Let S10.AI help you select the most accurate ICD-10 codes for . Our AI-powered assistant ensures compliance and reduces coding errors.

Quick Tips

Practical Coding Tips
  • Code I48.91, thyroid atrial fibrillation
  • Document thyroid function tests
  • Query physician if link unclear
  • Check for hyperthyroidism codes
  • Consider Z97.820 history

Documentation Templates

Patient presents with complaints consistent with atrial fibrillation (AFib), including palpitations, shortness of breath, and occasional chest discomfort.  Symptoms of hyperthyroidism, such as heat intolerance, weight loss, and anxiety, were also noted.  Physical examination revealed an irregular, rapid heart rate, and a mildly enlarged thyroid gland.  Electrocardiogram (ECG) confirmed atrial fibrillation with a rapid ventricular response.  Thyroid function tests (TFTs) revealed elevated levels of free T4 and free T3, with suppressed TSH, indicative of hyperthyroidism.  The diagnosis of thyroid-related atrial fibrillation is established based on the presence of both AFib and biochemical confirmation of hyperthyroidism.  Differential diagnoses considered included primary atrial fibrillation and other causes of palpitations.  Treatment plan includes rate control with beta-blockers, initiation of anticoagulation therapy to mitigate stroke risk, and management of the underlying hyperthyroidism with antithyroid medications such as methimazole or propylthiouracil.  Patient education regarding the importance of medication adherence, regular monitoring of thyroid function, and potential complications of both AFib and hyperthyroidism was provided. Follow-up appointments are scheduled to monitor treatment response and adjust medication as needed.  ICD-10 code I48.91 (Atrial fibrillation and flutter) and E05.9 (Thyrotoxicosis unspecified) are applicable.  CPT codes for services rendered, including evaluation and management (E/M), ECG, and laboratory testing, will be documented separately.