ICD-10-CM 2027 diagnosis code
J45.30Mild persistent asthma, uncomplicated
J45.30 is a valid, billable ICD-10-CM code for mild persistent asthma, uncomplicated. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Mild persistent asthma.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About J45.30
J45.30 is the ICD-10-CM diagnosis code for mild persistent asthma, uncomplicated. It belongs to category J45 (asthma), block J40-J4B (chronic lower respiratory diseases) and chapter 10 (diseases of the respiratory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within J45.3 (mild persistent asthma), J45.30 is specifically for mild persistent asthma, uncomplicated. Related codes cover with (acute) exacerbation (J45.31) and with status asthmaticus (J45.32).
Use an additional 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), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 202 (Bronchitis and Asthma with CC/MCC, relative weight 0.9474) and DRG 203 (Bronchitis and Asthma without CC/MCC, relative weight 0.6512), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 493.00 (extrinsic asthma, unspecified) and 493.10 (intrinsic asthma, unspecified).
Coding notes
- Mild persistent asthma NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to J45.30.
› From J45 Asthma
- 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
Broader instructions also apply from J40-J4B Chronic lower respiratory diseases and Chapter 10: Diseases of the respiratory system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to J45.30.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 04 · Diseases and Disorders of the Respiratory System
ICD-9-CM equivalent
Converter →From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about J45.30
Is J45.30 billable?
- Yes. J45.30 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J45.30 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J45.30 as a principal diagnosis.
Is J45.30 a CC or MCC?
- No. J45.30 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does J45.30 group to?
- J45.30 is used in the MS-DRG v44.0 logic for MS-DRG 202 (Bronchitis and Asthma with CC/MCC) and MS-DRG 203 (Bronchitis and Asthma without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for J45.30?
- The CMS General Equivalence Mappings map J45.30 to ICD-9-CM 493.00 and 493.10.