---
title: "ICD-10-CM J45.42: Moderate persistent asthma with status… | BillingBrief"
description: "ICD-10-CM code J45.42: Moderate persistent asthma with status asthmaticus. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/j45.42/"
language: "en"
---

# J45.42 Moderate persistent asthma with status asthmaticus

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Moderate persistent asthma with status asthmaticus

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Includes

-   allergic (predominantly) asthma
-   allergic bronchitis NOS
-   allergic rhinitis with asthma
-   atopic asthma
-   extrinsic allergic asthma
-   hay fever with asthma
-   idiosyncratic asthma
-   intrinsic nonallergic asthma
-   nonallergic asthma

### Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

-   detergent asthma (J69.8)
-   miner's asthma (J60)
-   wheezing NOS ([R06.2](https://billingbrief.com/icd10/r06.2/))
-   wood asthma (J67.8)
-   bronchitis due to chemicals, gases, fumes and vapors (J68.0)

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   asthma with chronic obstructive pulmonary disease ([J44.89](https://billingbrief.com/icd10/j44.89/))
-   chronic asthmatic (obstructive) bronchitis ([J44.89](https://billingbrief.com/icd10/j44.89/))
-   chronic obstructive asthma ([J44.89](https://billingbrief.com/icd10/j44.89/))
-   other specified chronic obstructive pulmonary disease ([J44.89](https://billingbrief.com/icd10/j44.89/))
-   cystic fibrosis (E84.-)

### Use additional code

Add a second code for the following, when documented.

-   code to identify:
-   eosinophilic asthma (J82.83)
-   exposure to environmental tobacco smoke (Z77.22)
-   exposure to tobacco smoke in the perinatal period (P96.81)
-   history of tobacco dependence ([Z87.891](https://billingbrief.com/icd10/z87.891/))
-   occupational exposure to environmental tobacco smoke (Z57.31)
-   tobacco dependence (F17.-)
-   tobacco use ([Z72.0](https://billingbrief.com/icd10/z72.0/))

## Related codes

-   [`J45.31` Mild persistent asthma with (acute) exacerbation ICD-10-CM](https://billingbrief.com/icd10/j45.31/)
-   [`J45.32` Mild persistent asthma with status asthmaticus ICD-10-CM](https://billingbrief.com/icd10/j45.32/)
-   [`J45.40` Moderate persistent asthma, uncomplicated ICD-10-CM](https://billingbrief.com/icd10/j45.40/)
-   [`J45.41` Moderate persistent asthma with (acute) exacerbation ICD-10-CM](https://billingbrief.com/icd10/j45.41/)
-   [`J45.50` Severe persistent asthma, uncomplicated ICD-10-CM](https://billingbrief.com/icd10/j45.50/)
-   [`J45.51` Severe persistent asthma with (acute) exacerbation ICD-10-CM](https://billingbrief.com/icd10/j45.51/)
-   [`J45.52` Severe persistent asthma with status asthmaticus ICD-10-CM](https://billingbrief.com/icd10/j45.52/)
-   [`J45.901` Unspecified asthma with (acute) exacerbation ICD-10-CM](https://billingbrief.com/icd10/j45.901/)

## Common questions

### Is J45.42 a billable code?

Yes. J45.42 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

J45 Asthma

Chapter

Diseases of the respiratory system

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).