What is the ICD-10 code for acute exacerbation of asthma?

The ICD-10 code for acute exacerbation of asthma varies by severity: J45.21 for mild intermittent, J45.31 for mild persistent, J45.41 for moderate persistent, and J45.51 for severe persistent.

How do you document an asthma exacerbation?

Document the severity, PEFR values, symptom frequency, and treatment response to accurately code an asthma exacerbation.

ICD-10 Coding for Acute Exacerbation of Asthma(J45.21, J20.9, J44.1)

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Learn about ICD-10 coding for acute exacerbation of asthma, including documentation requirements and common coding pitfalls.

Also known as:

Asthma AttackAsthma Flare-up

Related ICD-10 Code Ranges

Complete code families applicable to Acute Exacerbation of Asthma

J00-J99Primary Range

Diseases of the respiratory system

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
J45.21	Mild intermittent asthma with acute exacerbation	Use when the patient has mild intermittent asthma with documented acute exacerbation.	PEFR 50-70% of baseline Increased use of rescue inhalers
J45.31	Mild persistent asthma with acute exacerbation	Use when mild persistent asthma is exacerbated.	Daily symptoms Nighttime awakenings ≥2x/month
J45.41	Moderate persistent asthma with acute exacerbation	Use when moderate persistent asthma is exacerbated.	Daily symptoms Nighttime awakenings 3-4x/week PEFR 60-80% predicted
J45.51	Severe persistent asthma with acute exacerbation	Use when severe persistent asthma is exacerbated.	Continuous symptoms Frequent nighttime awakenings PEFR <60% predicted

Primary ICD-10-CM Codes

Mild intermittent asthma with (acute) exacerbation

J45.21Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

COPD with acute exacerbationJ44.1

COPD, unspecifiedJ44.9

Documentation & Coding Risks

Avoid these common issues when documenting Acute Exacerbation of Asthma.

Failing to document exacerbation status

Impact

Clinical: May lead to inappropriate treatment., Regulatory: Non-compliance with coding standards., Financial: Potential for claim denials.

Mitigation

Always document exacerbation status in the medical record.

Using J45.901 (unspecified asthma) when COPD coexists

Impact

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

Mitigation

Code only COPD (J44.9) if asthma is unspecified.

Incorrect coding of asthma severity

Impact

Misclassification of asthma severity can lead to audit findings.

Mitigation

Ensure thorough documentation of symptoms and treatment response.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with J45.21.

Primary Code

J45.21

Mild intermittent asthma with (acute) exacerbation

Quick Navigation

ICD-10 codes12

Coding risks3

FAQs2

ICD-10 Coding for Acute Exacerbation of Asthma(J45.21, J20.9, J44.1)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for acute exacerbation of asthma?

How do you document an asthma exacerbation?

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